SEARS GOVERNMENT INVESTMENT TRUST U S TREASURY SERIES 7
487, 1994-03-17
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<PAGE>
                        File No. 33-49975

               Investment Company Act No. 811-3718

                SECURITIES AND EXCHANGE COMMISSION
                     WASHINGTON, D.C.  20549
   
                         AMENDMENT NO. 1
                                TO
                             FORM S-6
    
For Registration Under the Securities Act of 1933 of Securities of
Unit Investment Trusts Registered on Form N-8B-2.

A.   Exact name of Trust:

     DEAN WITTER SELECT GOVERNMENT TRUST,
     U.S. TREASURY SERIES 7

B.   Name of Depositor:

     DEAN WITTER REYNOLDS INC.

C.   Complete address of Depositor's principal executive office:

     DEAN WITTER REYNOLDS INC.
     Two World Trade Center
     New York, New York  10048

D.   Name and complete address of agents for service:

     MR. MICHAEL D. BROWNE
     DEAN WITTER REYNOLDS INC.
     Unit Trust Department
     Two World Trade Center - 59th Floor
     New York, New York  10048

     Copy to:

     KENNETH W. ORCE, ESQ.
     CAHILL GORDON & REINDEL
     80 Pine Street - 19th Floor
     New York, New York  10005





<PAGE>

E.    Total and amount of securities being registered:

      An indefinite number of Units of Beneficial Interest pursuant to Rule
      24f-2 promulgated under the Investment Company Act of 1940, as amended.

F.    Proposed maximum offering price to the public of the securities being
      registered:

      Indefinite

G.    Amount of filing fee, computed at twenty-ninth of one percent of the
      proposed maximum aggregate offering price to the public:
   
      $500 (as required by Rule 24f-2)*
    
H.    Approximate date of proposed sale to public:

      AS SOON AS PRACTICABLE AFTER THE EFFECTIVE DATE OF THE REGISTRATION
      STATEMENT.
   
      __
    /X/     Check box if it is proposed that this filing will become effective
      immediately upon filing on March 17, 1994 pursuant to Rule 487.
    



   
_________________________
*     This amount was previously paid with the filing of the Preliminary
      Registration Statement.
    
<PAGE>

                     DEAN WITTER SELECT GOVERNMENT TRUST,
                              U.S. TREASURY SERIES 7


                             Cross-reference Sheet

                    Pursuant to Rule 404(c) of Regulation C
                       Under the Securities Act of 1933

                 (Form N-8B-2 Items required by Instruction 1
                         as to Prospectus on Form S-6)

Form N-8B-2                               Form S-6
Item Number                               Heading in Prospectus

      I.  ORGANIZATION AND GENERAL INFORMATION

1.    (a) Name of Trust                      ) Front Cover
      (b) Title of securities issued         ) Front Cover

2.    Name and address of Depositor          ) Table of Contents

3.    Name and address of Trustee            ) Table of Contents

Name and address of principal                ) Table of Contents
      Underwriter                            )

Organization of Trust                        ) Introduction

Execution and termination of                 ) Introduction;
      Indenture                              ) Amendment and Termination

Changes of name                              ) Included in Form
                                               N-8B-2

Fiscal year       ) Included in Form
                                             ) N-8B-2

Litigation        ) *

      II.  GENERAL DESCRIPTION OF THE TRUST
           AND SECURITIES OF THE TRUST

General Information regarding                )
      Trust's Securities and Rights          )
      of Holders

      (a)  Type of Securities                ) Rights of Unit Holders
            (Registered or Bearer)           )
______________________

*     Not applicable, answer negative or not required.
<PAGE>

      (b)  Type of Securities                ) Administration of the
            (Cumulative or                   ) Trust-Distribution from the
            Distributive)               ) Interest and Principal Accounts

      (c)  Rights of Holders as to           ) Redemption; Public
            withdrawal or redemption         ) Offering of Units-
                                             ) Secondary Market

      (d)  Rights of Holders as to           ) Public Offering of
            conversion, transfer, etc.       ) Units-Secondary
                                             ) Market; Exchange Option
                                             ) Redemption; Rights
                                             ) of Unit Holders

      (e)  Lapses or defaults with           ) *
            respect to periodic payment      )
            plan certificates                )

      (f)  Voting rights as to Secu-         ) Rights of Unit Holder
            rities under the Indenture       ) -Certain Limitations;
                                             ) Amendment and Termination
                                             )

      (g)  Notice to Holders as to           )
            change in:                       )

            (1)  assets of Trust             ) Administration of the
                                             ) Trust-Records and
                                             ) Accounts; The Trust-
                                             ) Summary Description
                                             ) of the Portfolio
            (2)  terms and conditions        ) Amendment and Termination
                  of Trust's Securities      )
            (3)  provisions of Trust         ) Amendment and Termination
                                             )
            (4)  identity of Depositor       ) Sponsor; Trustee
                      and Trustee            )




______________________

*     Not applicable, answer negative or not required.
<PAGE>

      (h)  Security Holders Consent          )
            required to change:              )

            (1)  composition of assets       ) Amendment and Termination
                  of Trust               )
            (2)  terms and conditions        ) Amendment and Termination
                                      )
            (3)  provisions of               ) Amendment and Termination
               Indenture                     )
            (4)  identity of Depositor       ) *
                  and Trustee                )

      (i)  Other provisions                  ) Cover of Prospectus;
                                             ) Tax Status of the Trust
                                             )

11.   Type of securities comprising          ) The Trust-Summary
      Units                                  ) Description of
                                             ) the Portfolio; -
                                             ) Objectives and
                                             ) Securities Selection;
                                             ) -Special   Considerations

12.   Type of securities comprising          ) *
      periodic payment certificates          )


13.   (a)   Load, fees, expenses, etc.       ) Summary of Essential
                                             ) Information; Public
                                             ) Offering of Units-Public
                                             ) Offering Price; -Profit
                                             ) of Sponsor;- Volume
                                             ) Discount; Expenses and
                                             ) Charges

      (b)  Certain information               ) *
            regarding periodic payment       )
            certificates                     )

      (c)   Certain percentages              ) Summary of Essential
                                             ) Information;
                                             ) Public Offering of
                                             ) Units-Public
                                             ) Offering Price
                                             )




______________________

*     Not applicable, answer negative or not required.
<PAGE>

      (d)   Price differentials              ) Public Offering of
                                             ) Units - Public
                                             ) Offering Price; - Volume
                                             ) Discount

      (e)   Certain other fees, etc.         ) Rights of Unit Holders
            payable by Holders               )

      (f)   Certain profits receivable       ) Redemption - Right of
            by Depositor, principal          ) Redemption; Profit of
            Underwriters, Trustee or         ) Sponsor
            affiliated persons               )

      (g)   Ratio of annual charges to       ) *
            income                           )

14.   Issuance of Trust's Securities         ) Introduction; Rights of
                                             ) Unit Holders
                                             )

15.   Receipt and handling of                ) Public Offering of Units-
      payments from purchasers               ) Profit of Sponsor

16.   Acquisition and disposition of         ) Introduction; The Trust-
      underlying securities                  ) Summary Description of the
                                             ) Portfolio; - Objectives
                                             ) and Securities Selection;
                                             ) Administration of the
                                             ) Trust

17.   Withdrawal or redemption by            ) Redemption;
      Security Holders                       ) Public Offering of Units-
                                             ) Secondary Market; Rights
                                             ) of Unit Holders

18.   (a)  Receipt and disposition of        ) Administration of the
            income                           ) Trust

      (b)  Reinvestment of distribu-         ) Reinvestment Program
            tions                            )

      (c)  Reserves or special fund          ) Administration of the
                                             ) Trust-Distribution from the
                                             ) Interest and Principal
                                             ) Accounts

      (d)  Schedule of distribution          ) *


______________________

*     Not applicable, answer negative or not required.
<PAGE>

19.   Records, accounts and report           ) Administration of the
                                             ) Trust-Records and
                                             ) Accounts;-Reports to
                                             ) Unit Holders

20.   Certain miscellaneous provi-           ) Administration of the
      sions of Indenture                     ) Trust; Amendment and
                                             ) Termination; Trustee;
                                             ) Sponsor

21.   Loans to Security Holders              ) *

22.   Limitations on liability               ) Sponsor; Trustee;
                                             ) Evaluator

23.   Bonding arrangements                   ) Included in Form N-8B-2

24.   Other material provisions of           ) *
      Indenture                              )

      III. ORGANIZATION, PERSONNEL AND AFFILIATED
            PERSONS OF DEPOSITOR

25.   Organization of Depositor              ) Sponsor

26.   Fees received by Depositor             ) Expenses and Charges -
                                             ) fees; Public Offering of
                                             ) Units-Profit of Sponsor

27.   Business of Depositor                  ) Sponsor and Included
                                             ) in Form N-8B-2

28.   Certain information as to              ) Included in Form N-8B-2
      officials and affiliated               )
      persons of Depositor                   )

29.   Voting securities of Depositor         ) Included in Form N-8B-2

30.   Persons controlling Depositor          ) *

31.   Payments by Depositor for              ) *
      certain other services                 )

32.   Payments by Depositor for              ) *
      certain other services                 )
      rendered to Trust                      )



______________________

*     Not applicable, answer negative or not required.
<PAGE>

33.   Remuneration of employees of           ) *
      Depositor for certain                  )
      services rendered to Trust             )

34.   Remuneration of other persons          ) *
      for certain services rendered          )
      to Trust                               )

      IV.   DISTRIBUTION AND REDEMPTION OF SECURITIES

35.   Distribution of Trust's                ) Public Offering of Units-
      securities by states                   ) Public Distribution

36.   Suspension of sales of Trust's         ) *
      securities                             )

37.   Revocation of authority to             ) *
      distribute                             )

38.   (a)  Method of distribution            ) Public Offering of Units
      (b)  Underwriting agreements           )
      (c)  Selling agreements                )

39.   (a)  Organization of principal         ) Sponsor
            Underwriter                      )
      (b)  N.A.S.D. membership of            )
            principal Underwriter            )

40.   Certain fees received by               ) Public Offering of Units-
      principal Underwriter                  ) Profit of Sponsor

41.   (a)  Business of principal             ) Sponsor
            Underwriter                      )
      (b)  Branch officers of                ) *
            principal Underwriter            )
      (c)  Salesman of principal             ) *
            Underwriter

42.   Ownership of Trust's Securities        ) *
      by certain persons

43.   Certain brokerage commissions          ) *
      received by principal                  )
      Underwriter                            )

44.   (a)  Method of valuation               ) Public Offering of Units
      (b)  Schedule as to offering           ) *
            price                            )
      (c)  Variation in offering             ) *
            price to certain persons         )



______________________

*     Not applicable, answer negative or not required.
<PAGE>

45.   Suspension of redemption rights        ) *

46.   (a)  Redemption valuation              ) Public Offering of Units-
                                             ) Secondary Market; Redemp-
                                             ) tion
      (b)  Schedule as to redemption         ) *
            price                            )

47.   Maintenance of position in             ) See items 10(d), 44
      underlying securities                  ) and 46

      V.   INFORMATION CONCERNING THE TRUSTEE
            OR CUSTODIAN

48.   Organization and regulation of         ) Trustee
      Trustee

49.   Fees and expenses of Trustee           ) Summary of Essential
                                             ) Information; Expenses and
                                             ) Charges

50.   Trustee's lien                         ) Expenses and Charges

      VI.  INFORMATION CONCERNING INSURANCE OF
            HOLDERS OF SECURITIES

51.   (a)  Name and address of               ) *
            Insurance Company                )
      (b)  Type of policies                  ) *
      (c)  Type of risks insured and         ) *
            excluded                         )
      (d)  Coverage of policies              ) *
      (e)  Beneficiaries of policies         ) *
      (f)  Terms and manner of               ) *
            cancellation                     )
      (g)  Method of determining             ) *
            premiums                         )
      (h)  Amount of aggregate               ) *
            premiums paid                    )
      (i)  Who receives any part of          ) *
            premiums                         )
      (j)  Other material provisions         ) *
            of the Trust relating to         )
            insurance                        )

______________________

*     Not applicable, answer negative or not required.
<PAGE>

     VII.  POLICY OF REGISTRANT

52.   (a)  Method of selecting and           ) Introduction; The Trust-
            eliminating securities from      ) Objectives and Securities
            the Trust                        ) Selection; -Summary
                                             ) Description of the
                                             ) Portfolio
      (b)  Elimination of securities         ) *
            from the Trust                   )
      (c)  Policy of Trust regarding         ) Introduction; The Trust-
            substitution and elimina-        ) Objectives and
            tion of securities               ) Securities Selection
      (d)  Description of any funda-         ) *
            mental policy of the Trust       )

53.   Taxable status of the Trust            ) Cover of Prospectus;
                                             ) Tax Status of the Trust

      VIII.  FINANCIAL AND STATISTICAL INFORMATION

54.   Information regarding the              ) *
      Trust's past ten fiscal years          )

55.   Certain information regarding          ) *
      periodic payment plan certifi-         )
      cates                                  )

56.   Certain information regarding          ) *
      periodic payment plan certifi-         )
      cates                                  )

57.   Certain information regarding          ) *
      periodic payment plan certifi-         )
      cates                                  )

58.   Certain information regarding          ) *
      periodic payment plan certifi-         )
      cates                                  )

59.   Financial statements                   ) Statement of Financial
      (Instruction 1(c) to Form S-6)         ) Condition




______________________

*     Not applicable, answer negative or not required.

<PAGE>
    DEAN
    WITTER
    SELECT
    Government Trust

   
U.S. TREASURY SERIES 7
(LADDERED MATURITIES)
- --------------------------------------
    
- --------------------------------------

500,000 Units
(A Unit Investment Trust)

Standard & Poor's Corporation Rating: AAA
- --------------------------------------------------------------------------------

   
The Trust was formed for the purpose of providing safety of capital and current
monthly distributions of interest through investment in a portfolio consisting
primarily of current interest-bearing United States Treasury obligations that
are backed by the full faith and credit of the United States Government. The
Securities will mature in a "laddered" fashion over approximately five years and
will provide for the return to the Unit Holders of approximately 20% of the per
Unit face amount of the Securities initially included in the Trust approximately
every 12 months beginning in 1996. The value of the Units of the Trust will
fluctuate with the value of the portfolio of underlying Securities. Interest
income (including original issue discount) or capital gains, if any, are exempt
from federal withholding taxes for qualified foreign investors if certain
conditions are met. UNITS OF A TRUST ARE NOT DEPOSITS OR OBLIGATIONS OF, OR
GUARANTEED OR ENDORSED BY, ANY BANK, AND THE UNITS ARE NOT FEDERALLY INSURED BY
THE FEDERAL DEPOSIT INSURANCE CORPORATION, FEDERAL RESERVE BOARD OR ANY OTHER
AGENCY.
    
- --------------------------------------------------------------------------------

Sponsor:  (DEAN WITTER REYNOLDS INC. LOGO)

- --------------------------------------------------------------------------------

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

READ AND RETAIN THIS PROSPECTUS FOR FUTURE REFERENCE.

                        PROSPECTUS DATED MARCH 17, 1994
<PAGE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       ATTENTION FOREIGN INVESTORS: YOUR
                        INCOME FROM THIS TRUST IS EXEMPT
                      FROM FEDERAL WITHHOLDING TAXES WHEN
                 CERTAIN CONDITIONS ARE MET UNDER CURRENT LAW.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
    This  Prospectus does not contain all of the information with respect to the
investment company set forth in its registration statement and exhibits relating
thereto which  have been  filed  with the  Securities and  Exchange  Commission,
Washington, D.C. under the Securities Act of 1933 and the Investment Company Act
of 1940, and to which reference is hereby made.

   
                      DEAN WITTER SELECT GOVERNMENT TRUST
                             U.S. TREASURY SERIES 7
    

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                          PAGE
                                                           ---
<S>                                                     <C>
Table of Contents.....................................          i
Summary of Essential Information......................         ii
Independent Auditor's Report..........................         vi
Statement of Financial Condition......................        vii
Schedule of Portfolio Securities......................       viii
Introduction..........................................          1
The Trust.............................................          1
    Special Considerations............................          1
    Summary Description of the Portfolio..............          2
    Rating of Units...................................          3
    Objectives and Securities Selection...............          3
    The Units.........................................          3
    Estimated Annual Income, Estimated Current Return
      and Estimated Long-Term Return..................          3
Tax Status of the Trust...............................          4
Retirement Plans......................................          5
Public Offering of Units..............................          6
    Public Offering Price.............................          6
    Public Distribution...............................          6
    Secondary Market..................................          6
    Profit of Sponsor.................................          7
    Volume Discount...................................          7
Reinvestment Program..................................          7
Redemption............................................          8
    Right of Redemption...............................          8
    Computation of Redemption Value...................          8
    Postponement of Redemption........................          9
Rights of Unit Holders................................          9
    Unit Holders......................................          9
    Certain Limitations...............................          9
Expenses and Charges..................................          9
    Initial Expenses..................................          9
    Fees..............................................          9
    Other Charges.....................................         10
Administration of the Trust...........................         10
    Records and Accounts..............................         10
    Distribution......................................         10
    Distribution from the Interest and Principal
     Accounts.........................................         10
    Reports to Unit Holders...........................         11
Sponsor...............................................         12
Trustee...............................................         12
Evaluator.............................................         13
Amendment and Termination.............................         14
Legal Opinions........................................         14
Auditors..............................................         14
Description of Rating.................................         14
</TABLE>

   
<TABLE>
<CAPTION>
         SPONSOR                       EVALUATOR                       TRUSTEE
- --------------------------  -------------------------------  ---------------------------
<S>                         <C>                              <C>
Dean Witter Reynolds Inc.   Kenny S&P Evaluation Services,      The Bank of New York
  Two World Trade Center             a division of               101 Barclay Street
 New York, New York 10048   Kenny Information Systems, Inc.   New York, New York 10286
                                      65 Broadway
                               New York, New York 10006
</TABLE>
    

    NO   PERSON  IS  AUTHORIZED   TO  GIVE  ANY  INFORMATION   OR  TO  MAKE  ANY
REPRESENTATIONS WITH RESPECT TO  THIS INVESTMENT COMPANY  NOT CONTAINED IN  THIS
PROSPECTUS  AND ANY INFORMATION OR REPRESENTATION  NOT CONTAINED HEREIN MUST NOT
BE RELIED UPON AS HAVING BEEN AUTHORIZED. THIS PROSPECTUS DOES NOT CONSTITUTE AN
OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO BUY, SECURITIES IN ANY STATE  TO
ANY PERSON TO WHOM IT IS NOT LAWFUL TO MAKE SUCH OFFER IN SUCH STATE.

                                       i
<PAGE>
   
                        SUMMARY OF ESSENTIAL INFORMATION
                      DEAN WITTER SELECT GOVERNMENT TRUST
                             U.S. TREASURY SERIES 7
                             as of March 16, 1994+
    

   
<TABLE>
<S>                                                                                        <C>
Face Amount of Securities................................................................  $500,000.00
Number of Units..........................................................................      500,000++
Fractional Undivided Interest in the Trust Represented by Each Unit......................    1/500,000th
Public Offering Price per 1,000 Units
    Aggregate offering side evaluation of Securities in the Trust........................  $   497,406
                                                                                           -----------
    Divided by 500,000 Units multiplied by 1,000.........................................  $    994.81
    Plus  sales charge of 1.500% of Public  Offering Price (1.523% of net amount invested
     in Securities)......................................................................        15.15
                                                                                           -----------
Public Offering Price per 1,000 Units*...................................................  $  1,009.96
                                                                                           -----------
                                                                                           -----------
Sponsor's Repurchase  Price and  Redemption Price  per  1,000 Units  (based on  bid  side
  evaluation  of underlying Securities, $15.78 less  than Public Offering Price per 1,000
  Units).................................................................................  $    994.18
                                                                                           -----------
                                                                                           -----------
Calculation of Estimated Net Annual Interest Rate  per 1,000 Units (based on face  amount
  of $1,000 per 1,000 Units)
    Annual Interest rate per 1,000 Units.................................................       5.500%
  Less estimated annual expenses per 1,000 Units ($1.93 expressed as a percentage).......        .193%
                                                                                           -----------
Estimated net annual interest rate per 1,000 Units.......................................       5.307%
                                                                                           -----------
                                                                                           -----------
Daily Rate at which Estimated Net Interest Accrues per 1,000 Units.......................       0.014%
Estimated Long-Term Return (based on Public Offering Price)**............................       5.431%
Estimated Current Return (based on Public Offering Price)**..............................       5.254%
Monthly Interest Distributions per 1,000 Units
    First  distribution, to be  paid on April 15,  1994 to Holders of  record on April 9,
     1994................................................................................  $      2.35
    Calculation of second and following distributions:
    Estimated net annual interest income.................................................  $     53.07
    Divided by 12........................................................................  $      4.42
</TABLE>
    

   
<TABLE>
<S>                                         <C>
Mandatory Termination Date................  May 1, 2000
Sponsor's Profit on Deposit...............  None
Record Date:..............................  Interest distributions:  the  ninth day  of  each  month.
                                            Principal distributions: the first business day following
                                            the maturity of each Security.
Distribution Date:........................  Interest  distributions: the fifteenth day of each month.
                                            Principal distributions: the third business day following
                                            the maturity of each Security.
Minimum Principal Distribution:...........  No distribution need be  made from the Principal  Account
                                            if  balance therein  is less  than $1.00  per 1,000 Units
                                            outstanding.
Trustee's   Annual   Fee   and    Expenses
(including estimated expenses and
Evaluator's  fee):  $1.68 per  $1,000 face
amount of  underlying  Securities  payable
commencing
April 9, 1994.............................  $1.68
Sponsor's   Annual  Portfolio  Supervision
Fee:  Maximum  of  $.25  per  $1,000  face
amount of underlying Securities...........  0.25
Total  Estimated Annual  Expense per 1,000
Units.....................................  $1.93
Evaluator's  Fee   for  each   Evaluation:
$10.00   plus  $.40  for   each  issue  of
underlying Securities
Evaluation Time:..........................  11:00 A.M. New York Time on Date of Deposit and 4:00 P.M.
                                            thereafter
Discretionary Liquidation Amount:.........  The Indenture may  be terminated  by the  Sponsor if  the
                                            value  of the Trust at  any time is less  than 40% of the
                                            market value of Securities deposited in the Trust.+++
</TABLE>
    

                                       ii
<PAGE>
- ---------

   +As of the  Date of Deposit.  The Date of  Deposit is the  date on which  the
Indenture was signed and the deposit of Securities with the Trustee was made.

  ++The  number of  Units will be  increased as the  Sponsor deposits additional
Securities into the Trust. (See "Introduction".)

 +++The final distribution  will be made  within 5 business  days following  the
receipt  of  proceeds  from  the  sale of  all  Securities  in  the  Trust. (See
"Administration of the Trust -- Termination".)

   
   *No accrued interest will be added to the Public Offering Price in connection
with purchases  of Units  contracted for  on  March 17,  1994. With  respect  to
purchases  contracted for after such date, accrued interest from March 24, 1994,
the first expected settlement date, to, but not including the date of settlement
(normally five  business  days after  purchase)  will  be added  to  the  Public
Offering Price.
    

  **The  Estimated Current Return  is calculated by dividing  the product of the
Estimated Net Annual Interest Rate per Unit times $1,000 by the Public  Offering
Price. The Estimated Net Annual Interest Rate will vary with changes in fees and
expenses  of the Trustee and the Evaluator  and with the principal prepayment or
redemption, if applicable, maturity,  exchange or sale  of Securities while  the
Public  Offering  Price will  vary with  changes  in the  offering price  of the
underlying Securities;  therefore,  there  is  no  assurance  that  the  present
Estimated  Current Return  indicated above will  be realized in  the future. The
Estimated Long Term Return  is calculated using a  formula which (1) takes  into
consideration,  and factors  in the relative  weightings of,  the market values,
yields (which takes into account the amortization of premiums and the  accretion
of  discounts) and estimated retirements  of all of the  Securities in the Trust
and (2) takes into  account the expenses and  sales charge associated with  each
Unit.  Since the market  values and estimated retirements  of the Securities and
the expenses of the Trust  will change, there is  no assurance that the  present
Estimated  Long Term Return as  indicated above will be  realized in the future.
The Estimated Current  Return and  Estimated Long  Term Return  are expected  to
differ  because the calculation  of the Estimated Long  Term Return reflects the
estimated date  and amount  of principal  returned while  the Estimated  Current
Return calculations include only estimated net annual interest income and Public
Offering Price as of the Date of Deposit.

    The  Estimated Long Term  Return and Estimated  Current Return are increased
for transactions  entitled  to  a  reduced sales  charge.  (See  "The  Trust  --
Estimated  Annual  Income,  Estimated  Current Return  and  Estimated  Long Term
Return" and "Public Offering of Units -- Volume Discount".)

                                      iii
<PAGE>
                SUMMARY OF ESSENTIAL INFORMATION -- (CONTINUED)

   
    THE TRUST -- The Dean Witter Select Government Trust, U.S. Treasury Series 7
(the  "Trust")  is  a  unit  investment  trust  composed  primarily  of  current
interest-bearing United States Government Treasury obligations issued after July
18, 1984 or contracts  to purchase such obligations,  listed in the Schedule  of
Portfolio  Securities  herein  (the  "Securities").  The  Securities  are direct
obligations of the United States and are backed by the full faith and credit  of
the  United States Government. The Trust was created under the laws of the State
of New York pursuant to an Indenture (as hereinafter defined). The objectives of
the Trust are to provide safety of capital and current monthly distributions  of
interest  through  investment in  a  portfolio consisting  primarily  of current
interest-bearing United States Treasury obligations.  After the initial Date  of
Deposit,  the Sponsor  may deposit additional  Securities in  the Trust (whereby
additional Units would be offered to  the public) provided that such deposit  of
additional  Securities (the  "Additional Securities")  maintains, to  the extent
possible, the original proportionate relationship with respect to the  principal
amounts  of Securities of  specified interest rates and  ranges of maturities in
the Trust. (See: "The Trust -- Special Considerations".)
    

   
    The  Trust  consists  of  a  fixed  portfolio  of  United  States   Treasury
obligations  with consecutive annual maturities ranges from February 15, 1996 to
April 15, 2000 (referred  to as "laddered maturities").  By doing so, the  Trust
maintains  a  portion  of  the  Portfolio  in  longer-term  Securities.  As  the
Securities mature, the Trust will return to Unit Holders approximately every  12
months  beginning in 1996, approximately 20% of  the per Unit face amount of the
Securities initially included in the Trust. If interest rates rise, Unit Holders
may  be  able  to  reinvest   their  principal  distributions  as  received   in
higher-yielding obligations. Therefore, Unit Holders are not "locking up" all of
their  principal investment over the life  of the Trust. Conversely, however, if
interest rates decline, Unit Holders will be receiving payments of principal  at
times  when only lower-yielding investments of comparable quality are available.
Reinvesting at such time may result in an over-all lower yield than would result
from a single investment maturing at the close of the life of the Trust.
    

   
    MONTHLY DISTRIBUTIONS -- Monthly distributions  of interest will be made  on
or  shortly after the fifteenth  day of each month to  Unit Holders of record on
the ninth day of each month commencing  with the first distribution on the  date
indicated  herein. Distribution of principal upon maturity of each Security will
be made on the third  business day after the maturity  date of such Security  to
Holders  of record on the  first business day following  such maturity date. The
Sponsor believes that interest income from this Trust (including original  issue
discount) should be free from state income taxes on individuals. In addition, an
exemption  from federal withholding taxes is available to qualified foreign Unit
Holders meeting certain requirements. (See: "Tax Status of the Trusts").
    

    Principal  from  sales,  redemptions  and   maturities  of  bonds  will   be
distributed  as received, to the extent not utilized for the redemption of Units
or payment of  Trust expenses. Interest  payments will decline  as principal  is
returned.

    SECURITIES  -- Five issues of Securities were  deposited in the Trust on the
initial Date of Deposit  in the following proportions  based on a percentage  of
total principal amount:

   
<TABLE>
<CAPTION>
                                                                                    PROPORTIONATE RELATIONSHIP
TITLE OF SECURITY                                                                         OF FACE AMOUNT
- ----------------------------------------------------------------------------------  --------------------------
<S>                                                                                 <C>
4.625% U.S. Treasury Notes Due February 15, 1996                                                   20%
6.25% U.S. Treasury Notes Due January 31, 1997                                                     20
5.625% U.S. Treasury Notes Due January 31, 1998                                                    20
5.50% U.S. Treasury Notes Due February 28, 1999                                                    20
5.50% U.S. Treasury Notes Due April 15, 2000                                                       20
                                                                                                   --
                                                                                                  100%
</TABLE>
    

   
    PRIMARY  MARKET PUBLIC OFFERING  PRICE -- The  Initial Public Offering Price
per 1,000  Units is  equal to  the  aggregate offering  side evaluation  of  the
underlying  Securities (the price  at which they could  be directly purchased by
the public  assuming  they were  available),  divided  by the  number  of  Units
outstanding  multiplied by 1,000, plus a sales charge of 1.523% of such offering
side evaluation per  1,000 Units (the  net amount invested);  this results in  a
sales  charge of  1.5% of the  Public Offering  Price. Units are  offered at the
Public Offering Price  plus the entire  amount of accrued  interest owed on  the
underlying Securities for Units which settle after the first settlement date for
the  Units (normally five business days  after purchase). (See: "Public Offering
of Units").
    

    SECONDARY MARKET FOR UNITS  -- The Sponsor, though  not obligated to do  so,
intends  to maintain a secondary market for the Units based on the aggregate bid
side evaluation of the underlying Securities. If such market is not  maintained,
a  Unit Holder will be able to dispose of his Units through redemption at prices
based on the aggregate  bid side evaluation of  the underlying Securities  (see:
"Redemption").  Market conditions  may cause such  prices to be  greater or less
than the amount paid for Units.

    SPECIAL CONSIDERATIONS -- An investment in Units of the Trust should be made
with  an  understanding  of  the  risks  which  an  investment  in  fixed   rate
intermediate-term debt obligations may entail, including the risk that the value
of  the Units  will decline  with increases  in interest  rates. An  increase in
interest rates can be expected to reduce the value of the Securities and  result
in  a loss to Unit  Holders selling or redeeming Units  prior to the maturity of
each Security. In addition, an early  redemption at par of a security  purchased
at  a premium, if applicable, or a maturity  at par of a security purchased at a
premium will result in a reduction in yield and a loss of principal to the  Unit
Holders.  The timing and percentage amount of principal return may vary from the
estimated  cash  flow  schedule  on  the  Date  of  Deposit  resulting  in   the

                                       iv
<PAGE>
increase  in, the decrease in,  or the elimination of,  a return of principal in
one or more  years. The  Trust is considered  to be  concentrated in  Securities
issued   by  the  United   States  of  America.  (See   "The  Trust  --  Special
Considerations" and "The Trust -- Summary Description of the Portfolio".)

   
    PUBLIC DISTRIBUTION -- Sales of Units  may be made pursuant to  distribution
arrangements  with certain banks and/or other  entities subject to regulation by
the Office of the  Comptroller of the  Currency (including NationsSecurities,  a
partnership  created pursuant  to a joint  venture between  NationsBank of North
Carolina, N.A. and an affiliate of the  Sponsor) which are acting as agents  for
their  customers.  These banks  and/or entities  are making  Units of  the Trust
available to their customers on an agency  basis. A portion of the sales  charge
paid  by these customers is retained by or remitted to such banks or entities in
an amount equal to the fee customarily  received by an agent for acting in  such
capacity  in  connection with  the  purchase of  Units.  The Glass  Steagall Act
prohibits banks from  underwriting certain  securities, including  Units of  the
Trust;  however, this Act  does permit certain  agency transactions, and banking
regulators have  not indicated  that these  particular agency  transactions  are
impermissible  under this Act.  In Texas, as  well as certain  other states, any
bank making Units available must be registered as a broker-dealer in that State.
    

    MINIMUM PURCHASE -- $1,000 ($250 for IRAs).

                  TABLE OF ESTIMATED CASH FLOW TO UNIT HOLDERS

    The  table  below  sets  forth,  per  1,000  Units,  the  estimated  monthly
distributions  of principal  and interest to  Unitholders. The  table assumes no
changes in expenses,  no changes  in current  interest rates  and no  exchanges,
redemptions, sales or prepayments of the underlying Securities prior to maturity
and the receipt of principal upon maturity. Actual distributions may vary.

   
<TABLE>
<CAPTION>
               DATE                  $ AMOUNT
- -----------------------------------  ---------
<S>                                  <C>
April 1994                                2.35
May 1994 - January 1996                   4.42
February 1996                           204.77
March 1996 - January 1997                 3.68
February 1997                           203.14
March 1997 - January 1998                 2.67

<CAPTION>
               DATE                  $ AMOUNT
- -----------------------------------  ---------
<S>                                  <C>
February 1998                           202.20
March 1998 - February 1999                1.77
March 1999                              201.29
April 1999 - March 2000                   0.88
April 2000                              201.30
</TABLE>
    

                                       v
<PAGE>
                          INDEPENDENT AUDITORS' REPORT

   
THE UNIT HOLDERS, SPONSOR AND TRUSTEE
DEAN WITTER SELECT GOVERNMENT TRUST
U.S. TREASURY SERIES 7
    

   
    We  have  audited  the  accompanying statement  of  financial  condition and
schedule of portfolio  securities of  the Dean Witter  Select Government  Trust,
U.S. Treasury Series 7, as of March 16, 1994. These financial statements are the
responsibility  of the Trustee.  Our responsibility is to  express an opinion on
these financial statements based on our audit.
    

   
    We conducted  our  audit  in accordance  with  generally  accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence  supporting
the amounts and disclosures in the financial statements. Our procedures included
confirmation  of the irrevocable letter of credit and contracts for the purchase
of securities, as shown in the statement of financial condition and schedule  of
portfolio  securities as of March  16, 1994, by correspondence  with The Bank of
New  York,  the  Trustee.  An  audit  also  includes  assessing  the  accounting
principles  used  and significant  estimates  made by  the  Trustee, as  well as
evaluating the overall  financial statement  presentation. We  believe that  our
audit provides a reasonable basis for our opinion.
    

   
    In  our  opinion,  the  statement of  financial  condition  and  schedule of
portfolio securities referred to above present fairly, in all material respects,
the financial position of the Dean Witter Select Government Trust, U.S. Treasury
Series 7 as of March 16,  1994 in conformity with generally accepted  accounting
principles.
    

DELOITTE & TOUCHE
   
March 16, 1994
    
New York, New York

                                       vi
<PAGE>
                        STATEMENT OF FINANCIAL CONDITION

   
                      DEAN WITTER SELECT GOVERNMENT TRUST
                             U.S. TREASURY SERIES 7
                              AS OF MARCH 16, 1994
    

   
<TABLE>
<CAPTION>
TRUST PROPERTY
<S>                                                                    <C>         <C>
    Sponsor's Contracts to Purchase underlying Securities backed by
     an irrevocable letter of credit (a).............................               $497,406.00
    Accrued interest to Date of Deposit on underlying Securities(a)
     (b).............................................................                 4,497.57
                                                                                   -----------
      Total..........................................................               $501,903.57
                                                                                   -----------
                                                                                   -----------
LIABILITY AND INTEREST OF UNIT HOLDERS
    Liability:
      Accrued interest to Date of Deposit on underlying Securities
       (a) (b).......................................................               $ 4,497.57
    Interest of Unit Holders:
      Units of fractional undivided interest outstanding:
        Cost to investors (c)........................................  $504,981.49
        Gross underwriting commissions (d)...........................   (7,575.49)  $497,406.00
                                                                       ----------  -----------
          Total......................................................               $501,903.57
                                                                                   -----------
                                                                                   -----------
<FN>
(a)  The  aggregate value of the Securities represented by Contracts to Purchase
     listed under "Schedule of Portfolio Securities" and their cost to the Trust
     are the same. The  value is determined  by the Evaluator  on the basis  set
     forth  under  "Public  Offering  of Units  --  Public  Offering  Price". An
     irrevocable letter of credit drawn on Morgan Guaranty Trust Company of  New
     York  in the amount of $500,000.00 has been deposited with the Trustee. The
     amount of the letter of credit includes $497,406.00 (equal to the  Purchase
     Price to Sponsor) for the purchase of $500,000.00 face amount of Securities
     pursuant  to  contracts  to purchase  Securities,  plus  $4,497.57 covering
     accrued interest thereon.
(b)  The Trustee will  advance an amount  equal to the  accrued interest on  the
     underlying  Securities to the first expected settlement date (normally five
     business days after purchase)  and such amount will  be distributed to  the
     Sponsor  as  the holder  of record  on such  date as  set forth  under Part
     B--"Public Offering of Units--Public Offering Price."
(c)  The aggregate  Public Offering  Price (exclusive  of accrued  interest)  is
     computed  on the basis set forth under  "Public Offering of Units -- Public
     Offering Price".
(d)  The aggregate sales charge of 1.50%  of the Public Offering Price per  Unit
     is  computed on  the basis  set forth  under "Public  Offering of  Units --
     Public Offering Price".
(e)  The Trustee  has  custody  of/and responsibility  for  all  accounting  and
     financial  books,  records, financial  statements and  related data  of the
     Trust and  is responsible  for  establishing and  maintaining a  system  of
     internal  control directly related  to, and designed  to provide reasonable
     assurance as to the integrity and reliability of financial reporting of the
     Trust. The  Trustee is  also  responsible for  all estimates  and  accruals
     reflected in the Trust's financial statements. The Evaluator determines the
     price  for each  underlying Security  included in  the Trust's  Schedule of
     Portfolio Securities on the basis set forth in Part B--"Public Offering  of
     Units--Public Offering Price." Under the Securities Act of 1933, as amended
     (the "Act"), the Sponsor is deemed to be an issuer of the Trust's Units. As
     such,  the Sponsor has the  responsibility of an issuer  under the Act with
     respect to financial statements of  the Trust included in the  Registration
     Statement under the Act and amendments thereto.
</TABLE>
    

                                      vii
<PAGE>
   
                        SCHEDULE OF PORTFOLIO SECURITIES
                      DEAN WITTER SELECT GOVERNMENT TRUST
                             U.S. TREASURY SERIES 7
                              AS OF MARCH 16, 1994
    

   
<TABLE>
<CAPTION>
                                                                                                       COST OF
                                                                                                      SECURITIES
 PORTFOLIO                                                      FACE       COUPON                      TO TRUST
    NO.      TITLE OF SECURITIES CONTRACTED FOR (1)            AMOUNT       RATE     MATURITY DATE      (2)(3)
- -----------  -----------------------------------------------  ---------  ----------  --------------  ------------
<C>          <S>                                              <C>        <C>         <C>             <C>
        1.   U.S. Treasury Note                               $ 100,000      4.625%     02/15/96     $   99,406
        2.   U.S. Treasury Note                                 100,000      6.250%     01/31/97        102,406
        3.   U.S. Treasury Note                                 100,000      5.625%     01/31/98         99,875
        4.   U.S. Treasury Note                                 100,000      5.500%     02/28/99         98,375
        5.   U.S. Treasury Note                                 100,000      5.500%     04/15/00         97,344
                                                                                                     ------------
                                                                                                     $  497,406
                                                                                                     ------------
                                                                                                     ------------
<FN>
- ---------
(1)   The  contracts to purchase Securities were  entered into on March 16, 1994
      with the final settlement date expected to be March 23, 1994.
(2)   Offering prices of Securities are determined by the Evaluator on the basis
      stated under  "Public Offering  of Units  -- Public  Offering Price".  The
      aggregate value based on the bid side evaluation at the Evaluation Time on
      the  Date of Deposit was $497,091, which  is $315 lower than the aggregate
      Cost of Securities to Trust based on the offering side evaluation.
(3)   Other information regarding Securities in the Trust:
      (a)     Purchase   Price   of  Securities   to   Sponsor   was   $497,406.
      (b)  Estimated Annual Interest Income to the Trust is $27,500.
</TABLE>
    

                                      viii
<PAGE>

                                                             No Postage
                                                             Necessary
                                                             If Mailed
                                                             In The
                                                             United States

                   ------------------------------------------
                              BUSINESS REPLY MAIL
                   FIRST CLASS PERMIT NO. 40864 NEW YORK, N.Y.
                   ------------------------------------------

      POSTAGE WILL BE PAID BY ADDRESSEE

      THE BANK OF NEW YORK
      DEAN WITTER SELECT GOVERNMENT
       REINVESTMENT PROGRAM
      UNIT INVESTMENT TRUST DIVISION
      P.O. BOX 974 -- WALL STREET STATION
      NEW YORK, N.Y. 10268-0974

<PAGE>
            DEAN WITTER SELECT GOVERNMENT TRUST REINVESTMENT PROGRAM
                                  REQUEST FORM

    I  would like to  learn more about  the Reinvestment Program  offered by the
Sponsor. I  understand  that  my  request for  more  information  regarding  the
Reinvestment  Program in no way obligates  me to participate in the Reinvestment
Program, and that this request form is not an offer to sell.

    Please send me more information, including a current prospectus for the Dean
Witter U.S. Government Money Market Trust.

<TABLE>
<S>                                                      <C>
Date: __________________________________, 19____         Signature of
                                                         Registered Holder:_________________________________
My name: ________________________________________                   (Two signatures if joint tenancy)
                         (please print)
                                                         My Social Security No.:____________________________
My address,
including Zip Code: _____________________________        My Brokerage Firm's Name:__________________________
                             (please print)
_________________________________________________        City & State: _____________________________________
                                                         Brokerage Firm's
Signature: ______________________________________        Account Number:____________________________________
</TABLE>

                      (All Information MUST Be Completed)
<PAGE>
                                                             OFFERING HIGHLIGHTS

- ------------------------------------------------------------------

   
Dean Witter Select Government Trust
U.S. Treasury Series 7
(Laddered Maturities)
    
- ----------------------------------------------
      NOW FOR AS LITTLE AS $1,000, YOU CAN INVEST IN
   A "AAA" RATED PORTFOLIO OF U.S. TREASURY SECURITIES AND ENJOY THESE IMPORTANT
   BENEFITS:
- ------------------------------------------------------

    - SAFETY AND QUALITY -- The Trust invests in U.S. Treasury securities, which
      are backed by the full faith and credit of the United States Government.

    - LADDERED MATURITIES -- The Trust's Portfolio has been structured to
      maintain a portion of the Portfolio in longer-term securities while paying
      a portion of the face value of your principal investment at intervals over
      the life of the Trust, rather than only at termination.

    - MONTHLY INCOME -- The Trust offers investors monthly distributions of
      interest.

    - INCOME FREE FROM STATE INCOME TAXES -- The Sponsor believes that the
      interest income from the Trust (including original issue discount) should
      be free from state income taxes on individuals.

    - TAX-EXEMPT FOR FOREIGN INVESTORS -- Interest (including original issue
      discount) and capital gains are exempt from federal withholding taxes for
      qualified foreign investors if certain conditions are met.

   
    The Offering Features are a part of the prospectus and should be read in
                                  conjunction
                          with the entire prospectus.
    
<PAGE>
Invest for Safety of Capital and Current Monthly
Income Through a Portfolio of U.S. Treasury Securities.

- -------------------------------------------------------------
Safety and Quality

       U.S. Treasury securities are considered one of the most attractive
       investments available. They are regarded as a "safe" investment since
       payment of interest and principal is an obligation of the United States
       Government. Although the Units of the Trust are not guaranteed by the
       United States Government, Standard & Poor's Corporation has rated Units
       of the Trust "AAA". This rating is assigned to investments offering the
       highest degree of safety and quality.

- --------------------------------------------------------------------------------
Laddered Maturities

   
       The portfolio of the Trust consists of government securities with annual
       maturities ranging from February 15, 1996 to April 15, 2000. The Trust
       will distribute approximately 20% of the per Unit face amount of the
       securities initially included in the Trust as received approximately
       every 12 months, beginning in 1996. By structuring the Portfolio in this
       way, the Trust maintains a portion of the Portfolio in longer-term
       securities while paying a portion of the face value of your principal
       investment at intervals over the life of the Trust, rather than paying
       the entire amount at the termination of the Trust. If interest rates
       rise, a portion of your investment will then be available for you to
       reinvest at higher rates. If interest rates fall, the portion of monies
       that remains invested will continue to earn relatively higher rates of
       income, although the portion that is distributed can be reinvested in
       comparable securities only at these lower rates.
    

- --------------------------------------------------------------------------------
Defined Portfolio

       The Trust is a fixed portfolio -- all of the securities in the Trust are
       listed in the Prospectus so you know in advance what you are purchasing
       and avoid the difficulty of assembling a portfolio on your own. Principal
       is returned on fixed dates specified in the Prospectus so you know when
       to expect distributions before you invest.

- --------------------------------------------------------------------------------
Monthly Income

       Even though U.S. Treasury securities pay interest on a semi-annual basis,
       the Trust will make interest distributions monthly. Or, if you prefer,
       you may have these earnings reinvested automatically.

- --------------------------------------------------------------------------------
Automatic Reinvestment

       Investors may elect to automatically reinvest interest income, as well as
       principal distributions, in the Dean Witter US Government Money Market
       Trust. Reinvesting interest and principal keeps your capital continually
       working for you.

- --------------------------------------------------------------------------------
Income Free from State Income Taxes

       The Sponsor believes that interest income from the Trust (including
       original issue discount) should be free from state income taxes on
       individuals. Please check with your tax counsel.

   
    The Offering Features are a part of the prospectus and should be read in
                                  conjunction
                          with the entire prospectus.
    
<PAGE>

- --------------------------------------------------------------------------------
Tax Exempt to Foreign Holders

       A qualified foreign holder will not be subject to federal withholding
       taxes on any interest (including original issue discount) or capital
       gains derived through the Trust if certain conditions are met.

- --------------------------------------------------------------------------------
Low Minimum Investment

       Each Unit is conveniently priced at approximately $1.00 and the minimum
       purchase is $1,000 ($250 for IRAs).

- --------------------------------------------------------------------------------
Volume Discounts

       The price of each Unit is based on the offering side value of the U.S.
       Treasury securities in the portfolio. The offering price during the
       initial offering period includes a maximum one-time sales charge of
       1.50%. Volume discounts are available on orders of $250,000 or more.

- --------------------------------------------------------------------------------
Liquidity at No Charge

       All or a portion of your Units can be redeemed at any time, without
       charge. The price you receive is based on the underlying bid side
       evaluation of the Treasury securities in the portfolio as determined each
       day by an independent evaluator. The price you receive will reflect the
       current market conditions and could be more or less than the price
       originally paid.

- --------------------------------------------------------------------------------
Retirement Accounts

       The Dean Witter Select Government Trust, U.S. Treasury Portfolio may be a
       suitable investment for a tax-deferred retirement account such as an IRA
       or Keogh plan.
- --------------------------------------------------------------------------------

   
    The Offering Features are a part of the prospectus and should be read in
                                  conjunction
                          with the entire prospectus.
    
<PAGE>
                               PROSPECTUS PART B
                      DEAN WITTER SELECT GOVERNMENT TRUST
                             U.S. TREASURY SERIES 7

                                  INTRODUCTION

   
    The  Dean  Witter  Select  Government Trust,  U.S.  Treasury  Series  7 (the
"Trust") was created under the laws of the State of New York pursuant to a Trust
Indenture and Agreement and a  related Reference Trust Agreement  (collectively,
the  "Indenture"),* among Dean Witter Reynolds Inc. (the "Sponsor"), The Bank of
New York (the "Trustee") and Kenny Information Systems, Inc. (the  "Evaluator").
The  Sponsor, Dean Witter Reynolds Inc.,  is a principal operating subsidiary of
Dean Witter, Discover &  Co., a publicly  traded corporation. (See:  "Sponsor".)
The  objectives of the Trust are to provide investors with safety of capital and
current  monthly  distributions  of  interest  through  investment  in  a  fixed
portfolio   of  Securities  (the  "Portfolio"),   consisting  of  U.S.  Treasury
obligations, which are backed by the full faith and credit of the United  States
Government.  Because  the  Securities  (as  defined  below)  in  the  Trust have
consecutive or "laddered" maturities, the Trust  will maintain a portion of  the
Portfolio  in longer-term securities  while paying to Unit  Holders a portion of
the principal invested each year, commencing in the year set forth in the  first
part of this prospectus.
    

    On  the date of creation  of the Trust (the  "Date of Deposit"), the Sponsor
deposited with the  Trustee the  underlying securities and  contracts and  funds
(represented  by the irrevocable letter(s) of  credit issued by major commercial
bank(s)) for the purchase of such securities (the "Securities"). (See: "Schedule
of Portfolio  Securities".)  The  Trust  was  created  simultaneously  with  the
execution  of the Indenture and the deposit  of the Securities with the Trustee.
The Trustee then immediately delivered to the Sponsor certificates of beneficial
interest (the "Certificates")  representing the units  (the "Units")  comprising
the  entire  ownership of  the Trust.  Through this  Prospectus, the  Sponsor is
offering the Units, including  Additional Units, as defined  below, for sale  to
the public. The holders of Certificates (the "Unit Holders") will have the right
to  have  their  Units redeemed  at  a price  based  on the  aggregate  bid side
evaluation of the Securities (the "Redemption Price") if they cannot be sold  in
the  secondary market which the Sponsor,  although not obligated to, proposes to
maintain. In addition, the  Sponsor may offer for  sale through this  Prospectus
Units which the Sponsor may have repurchased in the secondary market or upon the
tender of such Units for redemption.

    With  the deposit  of the  Securities in  the Trust  on the  initial Date of
Deposit, the  Sponsor  established  a  proportionate  relationship  between  the
principal  amounts of U.S. Treasury obligations  of specified interest rates and
ranges of maturities in  the Portfolio. During the  90-day period following  the
initial Date of Deposit, the Sponsor is permitted under the Indenture to deposit
additional  Securities (the "Additional  Securities") and any  cash in the Trust
not held for distribution to Unit Holders  prior to the deposit, resulting in  a
corresponding  increase  in the  number  of Units  outstanding  (the "Additional
Units"). Such  Additional Units  may be  continuously offered  for sale  to  the
public  by means of this Prospectus. The Sponsor anticipates that any Additional
Securities deposited in  the Trust during  the 90-day period  subsequent to  the
initial  Date  of Deposit  will maintain,  as far  as practicable,  the original
proportionate relationship  between  the  principal  amounts  of  U.S.  Treasury
obligations  of  specified  interest  rates  and  ranges  of  maturities  in the
Portfolio established  on  the Date  of  Deposit. Precise  duplication  of  this
original  proportionate relationship  may not  be possible  because fractions of
U.S. Treasury  obligations  may not  be  purchased  or for  other  reasons,  but
duplication  will continue to be the goal in connection with any such deposit of
Additional  Securities.  (These  original  proportionate  relationships  on  the
initial  Date of Deposit  are set forth in  "Summary of Essential Information".)
Deposits of  Additional Securities  in the  Portfolio subsequent  to the  90-day
period  following  the  initial  Date  of  Deposit  must  replicate  exactly the
proportionate relationship among the principal amounts of Securities  comprising
the Portfolio at the time of replication.

    On  the  initial  Date  of Deposit,  each  Unit  represented  the fractional
undivided interest in the Securities and net income of the Trust set forth under
"Summary of Essential Information" in the ratio of 1 Unit for each approximately
$1 principal  amount of  Securities initially  deposited in  the Trust.  Because
regular  payments of principal are to be  received and certain of the Securities
will mature  in  accordance  with their  terms  or  may be  sold  under  certain
circumstances   described  herein  and  because  Additional  Securities  may  be
deposited into the Trust from time to time, the Trust is not expected to  retain
its  present size and composition. Units  will remain outstanding until redeemed
upon tender to the Trustee by any Unit Holder (which may include the Sponsor) or
until the termination of the Trust pursuant to the Indenture.

                                   THE TRUST

SPECIAL CONSIDERATIONS

    An investment in Units of the Trust should be made with an understanding  of
the  risks  which  an investment  in  fixed  rate debt  obligations  may entail,
including the risk that the value of the Portfolio, and hence of the Units, will
decline with increases in interest rates. The value of the underlying Securities
will fluctuate inversely with  changes in interest rates.  In recent years,  the
national  economy has experienced  significant variations in  rates of inflation
and economic growth,  substantial increases  in the  national debt,  substantial
increase in reliance upon foreign
- ---------
* Reference is hereby made to said Indenture and any statements contained herein
  are qualified in their entirety by the provisions of said Indenture.
<PAGE>
investors  to finance the  national debt, and  material reformulation of federal
tax, monetary and  regulatory policies.  These conditions  have been  associated
with  wide fluctuations in  interest rates and  thus in the  value of fixed rate
debt obligations.  The Sponsor  cannot predict  whether such  fluctuations  will
continue in the future.

    The  Securities in the Portfolio  were chosen in part  on the basis of their
respective stated maturity dates.  The ranges of maturity  dates of each of  the
Securities  contained in the  Portfolio are shown on  the "Schedule of Portfolio
Securities".

    The Trust may be an appropriate medium for investors who desire to invest in
a portfolio of taxable  fixed income federal securities  offering the safety  of
capital  provided by  an investment in  U.S. Treasury obligations  backed by the
full faith and credit  of the United States  Government. Investors in the  Trust
may find it advantageous to elect to reinvest the monthly distributions expected
to  be made by the  Trust, under the Reinvestment  Program of the Sponsor. (See:
"Reinvestment Program".)

    Certain of the Securities in  the Trust may have  been acquired at a  market
premium.  Securities  trade  at a  premium  because  the interest  rates  on the
Securities are higher than interest  on comparable debt securities being  issued
at  currently  prevailing  interest  rates. The  current  returns  of securities
trading at a market  premium are higher than  the current returns of  comparably
rated  debt securities of a similar type issued at currently prevailing interest
rates because  premium securities  tend  to decrease  in  market value  as  they
approach  maturity, when  the face amount  becomes payable. Because  part of the
purchase price  is thus  returned not  at maturity  but through  current  income
payments,  an early redemption at  par of a security  purchased at a premium, if
applicable, or a  maturity at  par of  a security  purchased at  a premium  will
result  in a reduction in yield and a  loss of principal to the Unit Holders. If
currently prevailing interest  rates for newly  issued and otherwise  comparable
securities  increase, the  market premium  of previously  issued securities will
decline and if currently prevailing  interest rates for newly issued  comparable
securities  decline,  the market  premium of  previously issued  securities will
increase, other things being equal. Market premium attributable to interest rate
changes does not indicate market confidence in the issue.

SUMMARY DESCRIPTION OF THE PORTFOLIO

    The Portfolio consists of Securities issued by the United States of  America
("Treasury  Obligations"), which are direct obligations of the United States and
therefore are  backed  by  the  full  faith and  credit  of  the  United  States
Government.  As  used  herein,  the term  "Securities"  includes  the Securities
initially deposited in the Trust listed under "Schedule of Portfolio Securities"
and any Additional Securities which may be acquired and held by the Trust in the
circumstances permitted by the provisions  of the Indenture. The Securities  are
different  issues of  bonds, notes, debentures  and other  debt obligations with
fixed final maturity dates. None of the Securities have any equity or conversion
features. Most of the Securities are current interest-bearing obligations of the
United States of America or, in the case of Securities not delivered on the Date
of Deposit,  contracts to  purchase such  obligations assigned  to the  Trustee.
Certain of the Securities may be "zero coupon" obligations of the United States.
A  zero coupon  bond makes  no present interest  payments. Rather,  it makes one
payment of its face amount at maturity.

    Treasury Obligations represent  100% of  the aggregate market  value of  the
Portfolio.  These Securities  are sold  by the  United States  Department of the
Treasury (the "Treasury")  to finance shortfalls  between the Treasury's  income
and  expenditures. Such  gaps may  have been  planned and  accounted for  in the
budget, or they may arise from unexpected changes in economic, political, fiscal
and other  circumstances.  Treasury Securities  constitute  public debt  of  the
United States and are, therefore, direct obligations of the United States.

    The  Trust  consists  of  the  Securities  (or  contracts  to  purchase such
Securities together with  an irrevocable  letter or  letters of  credit for  the
purchase  of such contracts) listed under  "Schedule of Portfolio Securities" as
long as such Securities may continue to be  held from time to time in the  Trust
(including certain securities deposited in the Trust in exchange or substitution
for  any  Securities  pursuant  to  the  Indenture)  together  with  accrued and
undistributed interest thereon  and undistributed and  uninvested cash  realized
from  the disposition of Securities. Because certain of the Securities from time
to time may be redeemed, if applicable, or will mature in accordance with  their
terms  or may be sold under  certain circumstances described herein, and because
Additional Securities may  be deposited into  the Trust from  time to time,  the
Trust  is not  expected to retain  for any length  of time its  present size and
composition.

    In the event of a  failure to deliver any  Security that has been  purchased
for  the Trust, including Securities purchased on a when, as and if issued basis
("Contract Obligations") (the "Failed  Security" in the case  of the failure  to
deliver a Security purchased for the Trust and a "Failed Contract Obligation" in
the  case  of the  failure to  deliver  a Contract  Obligation), the  Sponsor is
authorized under the Agreement to direct the Trustee to acquire other securities
(the "Replacement Securities") and  to substitute them in  the Portfolio of  the
Trust  within 90  days of the  initial Date  of Deposit. Should  any Security or
Contract  Obligation  fail,  and  Replacement  Securities  are  not  substituted
therefor  in the  Portfolio, the  Sponsor will  refund to  each Unit  Holder the
portion of the sales charge and the pro rata portion of the cost of such  Failed
Security or Failed Contract Obligation.

   
    Replacement  Securities must  be deposited with  the Trustee  within 20 days
after delivery of notice  of a Failed Security  or a Failed Contract  Obligation
(but  in no event later than the 90th day following the initial Date of Deposit)
and the purchase price  thereof (exclusive of accrued  interest) may not  exceed
the  amount of  funds reserved  by the  Trustee pursuant  to a  letter of credit
supplied by  the Sponsor  for the  purchase  of the  Failed Security  or  Failed
Contract   Obligation.  The   Replacement  Securities   must  (i)   be  Treasury
Obligations, (ii) have  a fixed  maturity approximately  the same  as the  fixed
maturity  of  the Security  replaced, and  (iii)  be purchased  at a  price that
results in a yield to maturity and in  a current return, in each case as of  the
date  on which such Replacement Securities are deposited with the Trustee, which
is equivalent (taking into consideration then current market conditions) to  the
yield  to maturity and current  return of the related  Failed Security or Failed
Contract
    

                                       2
<PAGE>
Obligation. Whenever a Replacement Security has been acquired for the Trust, the
Trustee shall,  within five  days thereafter,  notify all  Unit Holders  of  the
acquisition  of  the Replacement  Security  and shall,  no  later than  the next
Distribution Date, make a pro rata distribution of the amount, if any, by  which
the  cost to  the Trust  of the  Failed Security  or Failed  Contract Obligation
exceeded the cost of the Replacement Security.

    The Sponsor,  although  not  obligated  to do  so,  intends  to  maintain  a
secondary  market for  the Units on  the bid side  of the market  for the Units.
(See: "Public  Offering of  Units --  Secondary Market".)  Unit Holders  of  the
Trust,  in the absence of  a secondary market for Units,  will have the right to
have one or more of  their Units redeemed with the  Trustee at a price equal  to
the  Redemption Value thereof  (see: "Redemption"), based  on the then aggregate
bid price for the Securities in the Portfolio. Due to fluctuations in the market
price of the Securities in  the Portfolio and the  fact that the initial  Public
Offering  Price is based on the offering side of the market and includes a sales
charge, among  other factors,  the amount  realized by  a Unit  Holder upon  the
redemption  or sale of Units may  be less than the price  paid for such Units by
the Unit Holder.

RATING OF UNITS

    Standard & Poor's Corporation has rated  the Units of the Trust "AAA".  This
is  the  highest  rating  assigned  by  Standard  &  Poor's  Corporation.  (See:
"Description of Rating".) Standard & Poor's Corporation has been compensated  by
the Sponsor for its services in rating Units of the Trust.

OBJECTIVES AND SECURITIES SELECTION

    The  Trust was formed to provide  investors with an investment vehicle whose
objectives are safety of capital and current monthly distributions of  interest.
There is no guarantee, however, that the Trust's objectives will be achieved.

    Even  though the Portfolio consists  primarily of Treasury Obligations which
pay interest  no more  often than  semi-annually, the  Trust will  pay  interest
monthly through advances made by the Trustee, which will then be reimbursed when
interest   is  received   (see:  "Distributions  from   Interest  and  Principal
Accounts").

    In selecting Securities  for deposit  in the Trust,  the following  factors,
among  others, were considered by the Sponsor:  (i) the types of such securities
available; (ii)  the prices  and yields  of such  securities relative  to  other
comparable securities; and (iii) the maturities of such securities.

    The yields on Securities of the type deposited in the Trust are dependent on
a variety of factors, including general money market conditions, fluctuations in
interest rates, general conditions of the government securities markets, size of
a particular offering and the maturity of the obligations.

THE UNITS

    On  the  initial  Date  of Deposit,  each  Unit  represented  the fractional
undivided  interest  in  the  Trust  set  forth  under  "Summary  of   Essential
Information",  in the ratio of 1 Unit for each $1 principal amount of Securities
in the Trust. Thereafter, if Units are redeemed by the Trustee, the face  amount
of  Securities in  the Trust  will be reduced  by amounts  allocable to redeemed
Units, and the  fractional undivided interest  represented by each  Unit in  the
balance will be increased, although the interest in the Trust assets represented
by  each Unit will remain unchanged. If additional Units are issued by the Trust
(through deposit by the Sponsor of Additional Securities in connection with  the
issuance  of Additional  Units), the aggregate  Securities in the  Trust will be
increased by amounts allocable to Additional Units, and the fractional undivided
interest represented by each Unit in the balance will be decreased, although the
interest in the  Trust assets represented  by each Unit  will remain  unchanged.
Units  will remain outstanding until redeemed upon  tender to the Trustee by any
Unit Holder (which  may include  the Sponsor) or  until the  termination of  the
Trust  itself (see: "Redemption" and "Amendment and Termination of the Indenture
- -- Termination").

ESTIMATED ANNUAL INCOME, ESTIMATED CURRENT RETURN AND ESTIMATED LONG-TERM RETURN

    On the initial Date  of Deposit, the estimated  net annual income per  1,000
Units  was estimated  to be  the amount  set forth  under "Summary  of Essential
Information". This  figure  is  computed  by dividing  the  total  gross  annual
interest  income expected  to be received  by the  Trust by the  number of Units
outstanding on  such  date, less  estimated  annual  fees and  expenses  of  the
Trustee,  the Sponsor and the Evaluator,  multiplied by 1,000 Units. Thereafter,
the net annual income  per 1,000 Units will  change whenever Securities  mature,
are  redeemed,  or  are sold,  or  as  substitute or  additional  Securities are
deposited into the Trust, or  as the expenses of the  Trust change. The fees  of
the Trustee, Sponsor and the Evaluator are subject to change without the consent
of Unit Holders to the extent provided under "Expenses and Charges".

    The  Estimated Current  Return is calculated  by dividing  the Estimated Net
Annual Income per Unit by the Public Offering Price per Unit. The Estimated  Net
Annual  Income  per Unit  will vary  with changes  in fees  and expenses  of the
Trustee and  the  Evaluator  and  with  the  principal  prepayment,  redemption,
maturity,  exchange or sale  of Securities while the  Public Offering Price will
vary with changes in the offering price of the underlying Securities; therefore,
there is no  assurance that the  present Estimated Current  Return indicated  in
Part  A will be  realized in the  future. The Estimated  Long-Term Return on the
Date of Deposit is set forth under "Summary of Essential Information". Estimated
Long-Term Return is  a measure of  the estimated return  to the investor  earned
over  the estimated life of the Trust. The Estimated Long-Term Return represents
an average of  the yields to  estimated average  life of the  Securities in  the
Portfolio   and  is  adjusted  to  reflect   expenses  and  sales  charges.  The

                                       3
<PAGE>
Estimated Long-Term Return  figure is calculated  by the Sponsor  in the  manner
discussed  below, using  an estimated average  life for each  of the Securities.
Estimated average life is  an essential factor in  the calculation of  Estimated
Long-Term  Return. When the Trust has a  shorter average life than is estimated,
Estimated Long-Term  Return will  be  higher if  the Trust  contains  securities
priced  at  a discount  and lower  if the  securities are  priced at  a premium.
Conversely, if the Trust has a longer average life than is estimated,  Estimated
Long-Term  Return will be lower when the securities are priced at a discount and
higher if  the securities  are priced  at a  premium. In  calculating  Estimated
Long-Term  Return, the average  yield for the Portfolio  is derived by weighting
each Security's yield (which takes into account the amortization of premiums and
the accretion of  discounts) by  the market  value of  the Security  and by  the
amount  of  time  remaining to  the  estimated  average life.  Once  the average
Portfolio yield is computed, this figure is then adjusted for estimated expenses
and the effect  of the  maximum sales charge  paid by  investors. The  Estimated
Current Return and Estimated Long-Term Return are expected to differ because the
calculation  of the Estimated  Long-Term Return reflects  the estimated date and
amount of principal  returned while  the Estimated  Current Return  calculations
include only Net Annual Interest Income and Public Offering Price as of the Date
of Deposit. The Estimated Current Return and the Estimated Long-Term Return will
be higher for those Unit Holders paying a reduced sales charge.

                            TAX STATUS OF THE TRUST

    In  the opinion of Messrs. Cahill Gordon  & Reindel, special counsel for the
Sponsor, under existing law:

        The Trust is  not an  association taxable  as a  corporation for  United
    States  Federal income tax purposes and income  of the Trust will be treated
    as income of  the Unit  Holders in  the manner  set forth  below. Each  Unit
    Holder  will be considered the owner of a  pro rata portion of each asset of
    the Trust under the grantor trust rules of Sections 671-678 of the  Internal
    Revenue Code of 1986, as amended (the "Code").

        Each  Unit Holder will be considered to have received his pro rata share
    of interest derived from each Trust asset when such interest is received  by
    the Trust. Each Unit Holder will be required to include in his gross income,
    as  determined for Federal income tax purposes, original issue discount with
    respect to his interest in a Security held by the Trust at the same time and
    in the same manner as though the  Unit Holder were the direct owner of  such
    interest.  Each Unit  Holder's pro  rata share of  each expense  paid by the
    Trust is deductible  by the Unit  Holder to  the same extent  as though  the
    expense had been paid directly by him.

        Each  Unit Holder will have a taxable  event when a Security is disposed
    of (whether by sale, exchange, redemption,  or payment at maturity) or  when
    the  Unit Holder redeems or sells his Units. The total tax cost of each Unit
    to a Unit Holder must be allocated among the cash and Securities held in the
    Trust in accordance with  their relative fair market  value on the date  the
    Unit Holder purchases his Units in order to determine his per Unit tax basis
    for  the Securities represented thereby. If a  Unit Holder's tax cost of his
    pro rata interest  in a Security  exceeds the amount  payable in respect  of
    such  pro rata interest upon the maturity  of the Security, such excess is a
    "bond premium"  which  may be  amortized  by the  Unit  Holder at  the  Unit
    Holder's election as provided in Section 171 of the Code.

    The  tax basis of a  Unit Holder with respect to  his interest in a Security
will be increased  by the  amount of  original issue  discount thereon  properly
included  in the Unit Holder's gross income as determined for Federal income tax
purposes.

   
    The amount  of gain  recognized  by a  Unit Holder  on  a disposition  of  a
Security by the Trust will be equal to the difference between such Unit Holder's
pro  rata portion of the gross proceeds realized by the Trust on the disposition
and the Unit Holder's  tax cost basis  in his pro rata  portion of the  Security
disposed  of. Any gain recognized  on a sale or exchange  of a Unit Holder's pro
rata interest  in a  Security, and  not constituting  a realization  of  accrued
"market  discount" and any  loss will be a  capital gain or  loss, except in the
case of a dealer or financial  institution. Gain realized on the disposition  of
the  interest  of a  Unit Holder  in a  market discount  Security is  treated as
ordinary income  to the  extent the  gain  does not  exceed the  accrued  market
discount.  A Unit Holder has an interest in a market discount Security in a case
in which the Unit Holder's tax cost for his pro rata interest in the Security is
less than the stated  redemption price thereof at  maturity (or the issue  price
plus  original issue discount accrued up to the acquisition date, in the case of
an original issue discount Security). Any capital gain or loss arising from  the
disposition  of  a Unit  Holder's  pro rata  interest in  a  Security will  be a
long-term capital gain or  loss if the  Unit Holder has held  his Units and  the
Trust  has held the Security for more than one year. Under the Code, net capital
gain (i.e., the excess of net long-term capital gain over net short-term capital
loss) of individuals,  estates and trusts  is subject to  a maximum nominal  tax
rate  of 28%. Such  net capital gain  may, however, result  in a disallowance of
itemized deductions and/or affect a personal exemption phase-out.
    

    If the Unit Holder sells or redeems a Unit for cash, he is deemed thereby to
have disposed of his entire pro rata interest in all Trust assets represented by
the Unit and will have a taxable gain or loss measured by the difference between
his per Unit  tax basis  for such  assets, as  described above,  and the  amount
realized.

    Under  the personal income tax  laws of the State and  City of New York, the
income of the Trust will be treated as the income of the Unit Holders.

    The Trust may contain one or more Securities which were originally issued at
a discount ("original issue discount"). In general, original issue discount  can
be  defined as the difference  between the price at  which a Security was issued
and its stated redemption price  at maturity. In the  case of a Security  issued
after  July 1, 1982, original  issue discount is deemed  to accrue on a constant
interest method  which  corresponds, in  general,  to the  economic  accrual  of
interest  (adjusted to  eliminate proportionately  on an  elapsed-time basis any
excess of the amount paid

                                       4
<PAGE>
for the Security over the sum of the issue price and the accrued original  issue
discount on the acquisition date). The tax basis in the Security is increased by
the  amount  of original  issue  discount that  is  deemed to  accrue  while the
Security is held. The difference between the amount realized on a disposition of
the Security (ex currently accrued interest)  and the adjusted tax basis of  the
Security will give rise to taxable gain or deductible loss upon a disposition of
the Security by the Trust (or a sale or redemption of Units by a Unit Holder).

    An  individual Unit Holder  who is neither  a citizen nor  a resident of the
United States and a  corporate Unit Holder other  than a United States  domestic
corporation  (a "foreign Unit  Holder") will not generally  be subject to United
States Federal income tax, including withholding  taxes, on his, her or its  pro
rata  share of interest  and original issue  discount on a  Security or any gain
from the sale or  other disposition of his,  her or its pro  rata interest in  a
Security  held in the  Trust, which interest  or original issue  discount is not
effectively connected with the conduct by the foreign Unit Holder of a trade  or
business  within the United States and which gain is either (i) not from sources
within the United States or (ii) not so effectively connected, provided that:

        (a) with respect to U.S. source interest and original issue discount (i)
    the Security is in registered form and was issued after July 18, 1984,  (ii)
    the  foreign Unit Holder does not  own actually or constructively 10 percent
    or more of the total combined voting power of all classes of voting stock of
    Dean Witter, Discover  & Co., and  (iii) the  foreign Unit Holder  is not  a
    controlled  foreign  corporation  related  (within  the  meaning  of Section
    864(d)(4) of the Code) to Dean Witter, Discover & Co.;

        (b) with  respect to  any  U.S.-source capital  gain, the  foreign  Unit
    Holder  (if an individual) is not present  in the United States for 183 days
    or more during his or her taxable year in which the gain was realized and so
    certifies; and

        (c)  the  foreign  Unit  Holder  provides  the  required  certifications
    regarding  (i)  his, her  or its  status,  (ii) in  the case  of U.S.-source
    income, the fact that the interest,  original issue discount or gain is  not
    effectively connected with the conduct by the foreign Unit Holder of a trade
    or  business  within  the  United  States, and  (iii)  if  determined  to be
    required, the 10 percent stock ownership and controlled foreign  corporation
    matters mentioned in clauses (a)(ii) and (iii) above.

    Foreign  Unit Holders should  consult their own tax  counsel with respect to
United States tax consequences of ownership of Units.

    Each Unit Holder (other than a foreign Unit Holder who has properly provided
the certifications described in  the preceding paragraph)  will be requested  to
provide  the Unit Holder's taxpayer identification  number to the Trustee and to
certify that the Unit  Holder has not  been notified that  payments to the  Unit
Holder are subject to back-up withholding. If the taxpayer identification number
and  an appropriate certification  are not provided  when requested, 31% back-up
withholding will apply.

    The foregoing discussion relates only to  United States Federal and, to  the
extent stated, New York State and City income taxes.

    Investors  should consult their tax counsel for advice with respect to their
own particular tax situations.

                                    *  *  *

    After the end of each calendar year,  the Trustee will furnish to each  Unit
Holder  an  annual statement  containing  information relating  to  the interest
received by the  Trust on  the Securities, the  gross proceeds  received by  the
Trust from the disposition of any Security (resulting from redemption or payment
at  maturity of any Security or the sale by the Trust of any Security ), and the
fees and expenses  paid by  the Trust. The  Trustee will  also furnish  required
annual  information  returns to  each Unit  Holder and  to the  Internal Revenue
Service.

    The Sponsor believes  that Unit Holders  who are individuals  should not  be
subject to state personal income taxes on the interest (including original issue
discount)   received  through  the  Trust.   However,  Unit  Holders  (including
individuals) may be subject to  state and local taxes  on any capital gains  (or
market  discount treated as ordinary income) derived from the Trust and to other
state and local taxes (including corporate income and franchise taxes,  personal
property  or intangibles taxes and estate or  inheritance taxes) on the Units or
the income  derived therefrom.  In addition,  individual Unit  Holders (and  all
other  Unit Holders which are not subject  to state income taxes with respect to
the interest  derived  from  the Trust)  will  probably  not be  entitled  to  a
deduction  for state tax purposes for their  share of the fees and expenses paid
by the Trust or for any interest  on indebtedness incurred to purchase or  carry
their  Units. Even though  the Sponsor believes  that interest income (including
original issue discount) received  through Trust is  exempt from state  personal
income  taxes on individuals  in most states, Unit  Holders should consult their
own tax advisers with respect to state and local taxation matters.

                                RETIREMENT PLANS

    Trust Units may be suited for purchase by Individual Retirement Accounts and
pension,  profit-sharing  and  other   qualified  retirement  plans.   Investors
considering  participation in any such plan  should review specific tax laws and
pending legislation related thereto  and should consult  their attorneys or  tax
advisers with respect to the establishment and maintenance of any such plan.

                                       5
<PAGE>
                            PUBLIC OFFERING OF UNITS

PUBLIC OFFERING PRICE

   
    The  Public Offering  Price of Units  during the initial  offering period is
computed by adding to the aggregate offering price, and thereafter by adding  to
the  aggregate  bid price,  of the  Securities in  the Trust,  any money  in the
Interest and Principal Accounts other than  money held to make payments to  Unit
Holders  on a monthly Distribution Date and amounts representing taxes, fees and
expenses of the Trust and money  required to redeem tendered Units, by  dividing
such  sum by the  number of Units  outstanding and then  adding the sales charge
shown in "Summary of  Essential Information". For  purchases settling after  the
first  settlement date (including  purchases of Units  created after the initial
date of deposit) a proportionate share of accrued and undistributed interest  on
the  Securities from such date to the settlement date for the Units purchased is
also added  to  the  Public  Offering Price.  (See:  "Estimated  Annual  Income,
Estimated  Current Return and  Estimated Long-Term Return  Per 1,000 Units".) In
addition, amounts necessary to be collected by the Trustee to permit the Trustee
to make equal  distributions to all  Unit Holders  will be added  to the  Public
Offering  Price upon the  initial sale of Additional  Units. The Public Offering
Price on the  date of this  Prospectus or on  any subsequent date  will vary  in
accordance  with fluctuations in the evaluation  of the underlying Securities in
the Trust.
    

    During the  initial public  offering period  and thereafter,  the  aggregate
offering  or bid prices of the Securities in the Trust, as is appropriate, shall
be determined  for the  Trust by  the Evaluator.  Following the  initial  public
offering  period, evaluations made for purposes of secondary market transactions
by the Sponsor will be made on the  bid side of the market on each business  day
as  of the Evaluation  Time, effective for  all sales made  during the preceding
24-hour period. Evaluations, for purposes of redemptions by the Trustee, will be
made each business day as of the Evaluation Time, effective for all  redemptions
made subsequent to the last preceding determination.

    In  addition to the Public Offering Price,  the price of a Unit includes the
Unit's share  of accrued  interest on  the Securities.  Because of  the  varying
interest  payment dates of the Securities, accrued interest on the Securities at
any point in time will be greater than the amount of interest actually  received
by  the Trust and  distributed to Unit  Holders. Therefore, the  Unit's share of
accrued interest is always  added to the  value of the Units.  If a Unit  Holder
sells all or a portion of his Units, he is entitled to receive his proportionate
share of the accrued interest on the Securities from the purchaser of his Units.
Similarly,  if  a  Unit  Holder redeems  all  or  a portion  of  his  Units, the
Redemption Price per Unit will include accrued interest on the Securities.

    On the Date of Deposit, the Public Offering Price per 1,000 Units (based  on
the  offering  side evaluation  of  the Securities  in  the Trust)  exceeded the
Sponsor's Repurchase Price per  1,000 Units and the  Redemption Price per  1,000
Units (based upon the bid side evaluation of the Securities in the Trust) by the
amounts set forth in "Summary of Essential Information".

PUBLIC DISTRIBUTION

    During  the  initial public  offering  period (i)  for  Units issued  on the
initial Date of Deposit and (ii) for Additional Units issued after such date  in
respect  of additional deposits of Securities,  Units will be distributed to the
public by  the  Sponsor  and  through dealers  at  the  Public  Offering  Price,
calculated  on each business  day, plus accrued interest  on the Securities. The
initial public offering period in each case is 30 days unless all Units are sold
prior thereto whereupon the initial  public offering period will terminate.  The
initial  public offering period may be extended  by the Sponsor as long as Units
remain unsold. Upon  the termination of  the initial public  offering period  in
each case, unsold Units or Units acquired by the Sponsor in the secondary market
referred  to below may be  offered to the public by  this Prospectus at the then
current Public  Offering Price  calculated daily  plus accrued  interest on  the
Securities.  The  Sponsor intends  to qualify  Units in  states selected  by the
Sponsor for sale  by the  Sponsor and  through dealers  who are  members of  the
National Association of Securities Dealers, Inc.

SECONDARY MARKET

    While  not obligated  to do  so, it  is the  Sponsor's present  intention to
maintain, at its expense,  a secondary market  for Units of  this series of  the
Dean  Witter Select  Government Trust  and to  continuously offer  to repurchase
Units for  Unit Holders  at  the applicable  Sponsor's Repurchase  Price.  (See:
"Summary  of Essential Information".) The Sponsor's Repurchase Price is computed
by adding to the aggregate of the bid prices of the Securities in the Trust, any
money in  the Interest  and Principal  Accounts other  than money  held to  make
payments  to Unit Holders on  a monthly Distribution Date  and money required to
redeem tendered  Units,  plus  accrued interest  on  the  Securities,  deducting
therefrom expenses of the Trustee, Sponsor, Evaluator and counsel, and taxes, if
any,  and then dividing the resulting sum by the number of Units outstanding, as
of the date of such computation. There is  no refund of the sales charge nor  is
there  any additional sales charge incurred, when a Unit Holder sells Units back
to the Sponsor. Any Units repurchased by the Sponsor at the Sponsor's Repurchase
Price may be reoffered to the public  by the Sponsor at the then current  Public
Offering  Price, plus  accrued interest. Any  profit or loss  resulting from the
resale of such Units will belong to the Sponsor.

    If the supply of  Units exceeds demand (or  for any other business  reason),
the  Sponsor may, at any time, occasionally,  from time to time, or permanently,
discontinue the repurchase of Units of  this series at the Sponsor's  Repurchase
Price. In such event, although under no obligation to do so, the Sponsor may, as
a  service to Unit Holders, offer to repurchase Units at the Redemption Price, a
price based on the current bid prices for the Securities, plus accrued interest.
Alternatively, Unit  Holders may  redeem their  Units through  the Trustee.  The
Redemption  Price  per Unit  is computed  in  the same  manner as  the Sponsor's
Repurchase Price, and is based on the bid side evaluation of the Securities, not
the offering side evaluation. There is no refund of the sales charge, nor is any
additional sales charge incurred, when a Unit

                                       6
<PAGE>
Holder redeems Units. If the Sponsor  repurchases Units in the secondary  market
at  the Redemption Price, it may reoffer  these Units in the secondary market at
the Public Offering Price or  the Sponsor may tender  Units so purchased to  the
Trustee  for redemption. In no  event will the price  offered by the Sponsor for
the repurchase  of Units  be less  than the  current Redemption  Price of  those
Units. (See: "Redemption".)

PROFIT OF SPONSOR

    The  Sponsor receives  a sales  charge on  Units sold  to the  public and to
dealers. The Sponsor may have also realized a book profit (or sustained a  loss)
on  the  deposit of  the  Securities in  the  Trust representing  the difference
between the cost of the Securities to the Sponsor and the cost of the Securities
to the Trust (for a description of such profit (or loss) and the amount of  such
difference see "Summary of Essential Information"). In addition, the Sponsor may
receive  placement fees or may realize profits or sustain losses with respect to
Securities acquired  from underwriting  syndicates  of which  the Sponsor  is  a
member.  During the initial public offering  period and thereafter to the extent
Additional Units continue to be issued and  offered for sale to the public,  the
Sponsor  may  realize  additional  profit  (or  sustain  a  loss)  due  to daily
fluctuations in the offering prices of the  Securities in the Trust and thus  in
the  Public  Offering Price  of Units  received  by the  Sponsor. Cash,  if any,
received by the Sponsor from the Unit  Holders prior to the settlement date  for
purchase of Units or prior to the payment for Securities upon their delivery may
be  used  in  the  Sponsor's  business to  the  extent  permitted  by applicable
regulations and may be of benefit to the Sponsor.

    The Sponsor may also realize profits (or sustain losses) while maintaining a
secondary market  in the  Units, in  the amount  of any  difference between  the
prices  at which the Sponsor buys Units (based on the bid side of the Securities
in the Trust)  and the  prices at  which the  Sponsor resells  such Units  (such
prices  include a sales charge) or the  prices at which the Sponsor redeems such
Units (based on the bid  side of the Securities in  the Trust), as the case  may
be.

VOLUME DISCOUNT

    Although  under no obligation to do so, the Sponsor intends to permit volume
purchasers of Units to purchase Units at a reduced sales charge. The Sponsor may
at any time  change the  amount by  which the sales  charge is  reduced, or  may
discontinue  the  discount  altogether. This  discount  in the  sales  charge is
available to volume purchasers of Units  due to the realization of economies  of
scale in sales effort and sales related expenses relating to volume purchases.

    The  sales charge will be reduced  pursuant to the following graduated scale
for sales to any person of at least $250,000:

<TABLE>
<CAPTION>
                                                                  SALES CHARGE
                             --------------------------------------------------------------------------------------
                                              INITIAL                                    SECONDARY
                             ------------------------------------------  ------------------------------------------
                                  PERCENT OF            PERCENT OF            PERCENT OF            PERCENT OF
                             PUBLIC OFFERING PRICE  NET AMOUNT INVESTED  PUBLIC OFFERING PRICE  NET AMOUNT INVESTED
                             ---------------------  -------------------  ---------------------  -------------------
<S>                          <C>                    <C>                  <C>                    <C>
Less than $250,000.........            1.50%                1.523%                 1.75%                1.781%
$250,000 to $499,999.......            1.25%                1.266%                 1.50%                1.523%
$500,000 or more...........            1.00%                1.010%                 1.25%                1.266%
</TABLE>

    The reduced sales  charges as shown  on the  chart above will  apply to  all
purchases  of  Units of  this Trust  only on  any  one day  by the  same person,
partnership or corporation (other than a dealer) in the amounts stated herein.

    Units held  in the  name of  the  purchaser's spouse  or in  the name  of  a
purchaser's  child under the age of 21 are  deemed for the purposes hereof to be
registered in the  name of  the purchaser. The  reduced sales  charges are  also
applicable  to  a  trustee  or  other  fiduciary,  including  a  partnership  or
corporation, purchasing  Units for  a single  trust estate  or single  fiduciary
account.

   
    Sales  to  dealers will  be made  at  prices which  include a  concession as
follows:
    

   
<TABLE>
<CAPTION>
          PRIMARY MARKET                      SECONDARY MARKET
- -----------------------------------  -----------------------------------
 SALES CHARGE    DEALER CONCESSION    SALES CHARGE    DEALER CONCESSION
- ---------------  ------------------  ---------------  ------------------
<S>              <C>                 <C>              <C>
       1.50%             1.05 %             1.75%             1.22 %
       1.25               .875              1.50              1.05
       1.00               .70               1.25               .875
</TABLE>
    

    Dealers purchasing certain dollar  amounts of Units during  the life of  the
Trust  will be entitled to additional concession benefits. The dealer concession
for secondary market  sales may  differ from the  concessions set  forth in  the
above schedule. The Sponsor reserves the right, at any time, to change the level
of dealer concessions.

                              REINVESTMENT PROGRAM

   
    Distributions  of  interest,  if  any, are  made  to  Unit  Holders monthly.
Distributions of principal will be made annually beginning in the year mentioned
previously in this prospectus and may be more frequent. The Unit Holder has  the
option,  however, of either receiving his  distributions of income and principal
from the Trustee  or participating in  the reinvestment program  offered by  the
Sponsor,  the Dean Witter  U.S. Government Money Market  Trust (the "Fund"). The
Fund is  composed primarily  of high-yielding  short-term government  securities
that  are  managed  by  the  InterCapital  Division  of  the  Sponsor.  Dividend
distributions from the Fund  to foreign investors will  generally be subject  to
U.S.
    

                                       7
<PAGE>
   
withholding  taxes. Participation in the  reinvestment program is conditioned on
such program's lawful  qualification for  sale in the  state in  which the  Unit
Holder  is a  resident. For more  information concerning this  program, the Unit
Holder should  fill out  and  mail in  the attached  card  to the  Trustee.  The
appropriate prospectus will be sent to the Unit Holder. A Unit Holder's election
to  participate in  the reinvestment  program will  apply to  all Units  of this
series of the Trust owned by such  Unit Holder. The Unit Holder should read  the
prospectus   for  the   reinvestment  program   carefully  before   deciding  to
participate. Once a Reinvestment  Election has been chosen  by the Unit  Holder,
such election shall remain in effect until changed by the Unit Holder.
    

    Any Unit Holder may, by filing with the Trustee a written notice of election
at  least ten days before the Record Date for the first distribution to which it
is to apply,  elect to  have distributions of  principal and  interest, if  any,
reinvested  in the Dean Witter U.S.  Government Money Market Trust. Unit Holders
participating in Individual Retirement Accounts and pension, profit-sharing  and
other  qualified retirement plans, should consult their plan custodian as to the
appropriate disposition of distributions. Elections  may be modified or  revoked
upon similar notice.

                                   REDEMPTION

RIGHT OF REDEMPTION

    Units  represented by a Certificate may be redeemed at the Redemption Price,
computed as set forth below, upon tender  of such Certificate to the Trustee  at
its  unit investment trust office in the  City of New York, properly endorsed or
accompanied by a  written instrument  of transfer  in form  satisfactory to  the
Trustee, as set forth in the Certificate, and executed by the Unit Holder or its
authorized  attorney. A Unit Holder  may tender his Units  for redemption at any
time after the settlement date for purchase, whether or not such Unit Holder has
received a definitive Certificate. The  Redemption Price per Unit is  calculated
by  adding to  the current bid  prices for the  Securities in the  Trust (1) any
money in the Principal Account and  Interest Account, other than money  required
to  redeem tendered  Units, (2)  a proportionate  share of  accrued interest and
undistributed interest income on  the Securities not  subject to collection  and
distribution,  determined to  the day  of tender  plus a  sum equivalent  to the
amount of accrued interest  which would have been  payable with respect to  such
tendered Units as of the date of computation deducting therefrom expenses of the
Trustee,  the Sponsor, the Evaluator and counsel and taxes, if any, and dividing
the resulting sum  by the number  of Units outstanding  as of the  date of  such
computation.  There is no sales charge incurred when a Unit Holder tenders Units
to the  Trustee for  redemption. The  Unit  Holder is  entitled to  receive  the
Redemption  Price on  the seventh  calendar day  following tender.  The "date of
tender" is deemed to be the date on which the Units are received by the Trustee,
except as regards Units received after the Evaluation Time stated under "Summary
of Essential Information",  the date of  tender is  the next day  on which  such
Exchange is open for trading and such Units will be deemed to have been tendered
to  the Trustee on such  day for redemption at  the Redemption Price computed on
that day.

    Any amounts  to  be  paid  on  redemption  representing  interest  shall  be
withdrawn from the Interest Account to the extent funds are available or, if the
balance  therein is insufficient, from the  Principal Account. All other amounts
paid on redemption shall be withdrawn from the Principal Account. The Trustee is
authorized by the  Indenture to sell  Securities in order  to provide funds  for
redemption.  To the  extent Securities  are sold,  the size  of a  Trust will be
reduced. The  Trustee will  attempt  to maintain  the  proportions of  types  of
Securities  in  the  Trust  if  required to  sell  Securities  pursuant  to this
provision. Such  sales may  be required  at  a time  when Securities  would  not
otherwise  be sold  and might  result in  lower prices  than might  otherwise be
realized. Moreover, due to the minimum principal amount in which Securities  may
be  required  to be  sold,  the proceeds  of such  sales  may exceed  the amount
necessary  for  payment  of  Units  redeemed.  Such  excess  proceeds  will   be
distributed  pro  rata  to all  remaining  Unit  Holders of  record  unless such
proceeds are used to purchase Additional Securities.

    The Securities  to  be sold  for  purposes of  redeeming  Units will  be  in
proportion  to the different types of Securities in the Trust. Provision is made
under the Indenture  for the Sponsor  to specify minimum  face amounts in  which
blocks  of Securities are to be  sold in order to obtain  the best price for the
Trust.

COMPUTATION OF REDEMPTION PRICE

    The value of the Trust is determined as of the Evaluation Time stated  under
"Summary of Essential Information" and (a) semiannually, on June 30 and December
31  of each year  (or the last  Business Day prior  thereto), (b) on  the day on
which any Unit  is tendered for  redemption and  (c) on any  other Business  Day
desired by the Trustee or requested by the Sponsor.

        (1)  by adding: the  aggregate bid side evaluation  of Securities in the
    Trust, as determined by the Evaluator; cash  on hand in the Trust or  moneys
    in  the process  of being collected  from matured interest  coupons or bonds
    prepaid, matured or  called for  redemption, other than  money deposited  to
    purchase  Contract Obligations or money credited to the Reserve Account; and
    accrued but unpaid interest  on the Securities at  the close of business  on
    the date of such Evaluation; and then,

        (2)  by deducting  from the  resulting figure:  amounts representing any
    applicable taxes or governmental  charges payable out of  the Trust for  the
    purpose  of making  an addition  to the reserve  account (as  defined in the
    Indenture, the "Reserve Account"), amounts representing accrued expenses  of
    the  Trust (including, but not limited  to, amounts representing unpaid fees
    of the Trustee, the Sponsor, bond counsel and the Evaluator) and monies held
    for distribution  to Unit  Holders  of record  as of  a  date prior  to  the
    evaluation being made on the days or dates set forth above; and then,

                                       8
<PAGE>
        (3)  by dividing the result of the above computation by the total number
    of Units outstanding on the date of evaluation. The resulting figure  equals
    the Redemption Price per Unit.

POSTPONEMENT OF REDEMPTION

    The right of redemption may be suspended and payment of the Redemption Price
per Unit postponed for more than seven calendar days following a tender of Units
for  redemption for any period during which the New York Stock Exchange, Inc. is
closed, other than for customary weekend  and holiday closings, or during  which
trading  on that Exchange  is restricted or  an emergency exists  as a result of
which disposal or evaluation of the Securities is not reasonably practicable, or
for such other periods  as the Securities and  Exchange Commission may by  order
permit.  The Trustee is not liable  to any person or in  any way for any loss or
damage that may result from any such suspension or postponement.

                             RIGHTS OF UNIT HOLDERS

UNIT HOLDERS

    A Unit Holder  is deemed to  be a beneficiary  of the Trust  created by  the
Indenture  and vested with  all right, title  and interest in  the Trust created
therein. A Unit Holder may at any  time tender a Certificate to the Trustee  for
redemption.  Ownership  of  Units  is evidenced  by  registered  Certificates of
Beneficial Interest issued in denominations of one or more Units and executed by
the  Trustee  and   the  Sponsor.   These  Certificates   are  transferable   or
interchangeable  upon presentation  at the unit  investment trust  office of the
Trustee,  properly  endorsed  or  accompanied  by  an  instrument  of   transfer
satisfactory  to the Trustee and  executed by the Unit  Holder or its authorized
attorney, together with  the payment of  $2.00, if required  by the Trustee,  or
such  other  amount as  may be  determined by  the Trustee  and approved  by the
Sponsor, and any other tax or  governmental charge imposed upon the transfer  of
Certificates.  The Trustee will replace any mutilated, lost, stolen or destroyed
Certificate upon proper  identification, satisfactory indemnity  and payment  of
charges  incurred. Any  mutilated Certificate must  be presented  to the Trustee
before any substitute Certificate will be issued.

CERTAIN LIMITATIONS

    Consent of  Unit Holders  is not  required except  with respect  to  certain
amendments  and terminations of  the Trust. (See:  "Amendment and Termination of
the Indenture".) Unit Holders  shall have no right  to control the operation  or
administration  of the Trust in  any manner, except upon the  vote of 51% of the
Unit Holders outstanding at any time  for purposes of amendment, or  termination
of  the Trust, all as  provided in the Indenture;  however, no Unit Holder shall
ever be under  any liability  to any  third party for  any action  taken by  the
Trustee, the Evaluator or the Sponsor.

    The death or incapacity of any Unit Holder will not operate to terminate the
Trust or entitle the legal representatives or heirs of such Unit Holder to claim
an  accounting or  to take  any other action  or proceeding  in any  court for a
partition or winding up of the Trust.

                              EXPENSES AND CHARGES

INITIAL EXPENSES

   
    All expenses and charges  incurred prior to or  in the establishment of  the
Trust,  including  the  initial  preparation,  printing  and  execution  of  the
Indenture and the Certificates, the initial fees of the Evaluator, initial legal
and auditing  expenses,  the  cost  of the  preparation  and  printing  of  this
Prospectus and all other advertising and selling expenses, have been or will be,
paid by the Sponsor or the Trustee and not the Trust.
    

FEES

    The  Sponsor's  fee is  set forth  in "Summary  of Essential  Information --
Sponsor's Annual Supervision Fee."  Such fee, which is  calculated on an  annual
basis, is earned for Portfolio supervisory services and is paid monthly.

    For  its  services  as Trustee  under  the Indenture,  the  Trustee receives
annually the amount set forth under "Summary of Essential Information," computed
on the basis of the largest principal  amount of Securities in the Trust at  any
time  during the  period with  respect to which  such compensation  is made. The
Trustee also receives benefits to the extent  that it holds funds on deposit  in
various non-interest bearing accounts created under the Indenture.

   
    For  each evaluation  of the  Securities in  the Trust,  the Evaluator shall
receive against a statement submitted  to the Trustee a  fee as set forth  under
"Summary of Essential Information."
    

    The Sponsor's fee, Trustee's fees and the Evaluator's fees are payable as of
each  Record Date from the  Interest Account, to the  extent funds are available
and thereafter from  the Principal Account.  Any of such  fees may be  increased
without  approval  of the  Unit  Holders in  accordance  with the  terms  of the
Indenture.

                                       9
<PAGE>
OTHER CHARGES

    The following additional  charges are or  may be incurred  by the Trust,  as
more fully described in the Indenture: (a) fees of the Trustee for extraordinary
services,  (b) expenses of  the Trustee (including  legal and auditing expenses)
and of counsel designated by the Sponsor, (c) various governmental charges,  (d)
expenses  and costs of any action taken by  the Trustee to protect the Trust and
the rights and interests of the Unit Holders, (e) indemnification of the Trustee
for any loss, liability or expenses incurred by it in the administration of  the
Trust  without gross negligence, bad faith or  willful misconduct on its part or
reckless disregard of  its obligations  and duties, (f)  indemnification of  the
Sponsor  for any losses, liabilities and  expenses incurred in acting as Sponsor
or Depositor under the Indenture without gross negligence, bad faith or  willful
misconduct or reckless disregard of its obligations and duties, (g) expenditures
incurred in contacting Unit Holders upon termination of the Trust and (h) to the
extent  then lawful, expenses (including  legal, auditing and printing expenses)
of maintaining registration or qualification of the Units and/or the Trust under
Federal or state securities laws so long as the Sponsor is maintaining a  market
for  the Units. The  accounts of the  Trust will be  audited not less frequently
than annually by  independent public  accountants selected by  the Sponsor.  The
cost of such audits will be an expense of the Trust.

    The fees and expenses set forth herein are payable out of the Trust and when
so  paid by or owing to  the Trustee are secured by a  lien on the Trust. If the
balances in the Interest and Principal Accounts are insufficient to provide  for
amounts  payable by the Trust,  the Trustee has the  power to sell Securities to
pay such amounts. To the extent Securities are sold, the size of the Trust  will
be  reduced and  the proportions  of the types  of Securities  will change. Such
sales might be required at  a time when Securities  would not otherwise be  sold
and might result in lower prices than might otherwise be realized. Moreover, due
to  the minimum principal amount in which Securities may be required to be sold,
the proceeds of such sales  may exceed the amount  necessary for the payment  of
such fees and expenses.

                          ADMINISTRATION OF THE TRUST

RECORDS AND ACCOUNTS

   
    The  Trustee will keep records and accounts of all transactions of the Trust
at its unit investment trust  office at 101 Barclay  Street, New York, New  York
10286.  These records and accounts and an executed copy of the Indenture will be
available for  inspection by  Unit  Holders at  reasonable times  during  normal
business  hours. The  Trustee will additionally  keep on file  for inspection by
Unit Holders a current list of the  Securities held in the Trust. In  connection
with  the storage and handling of certain Securities deposited in the Trust, the
Trustee is authorized  to use the  services of Depository  Trust Company.  These
services  would include safekeeping of the Securities, coupon-clipping, computer
book-entry transfer and  institutional delivery services.  The Depository  Trust
Company  is a limited purpose  trust company organized under  the Banking Law of
the State of New  York, a member  of the Federal Reserve  System and a  clearing
agency registered under the Securities Exchange Act of 1934.
    

DISTRIBUTION

   
    The  Trustee will collect  the interest on  the Securities (including monies
representing  penalties  for  the  failure  to  make  timely  payments  on   the
Securities, liquidated damages for default or breach of any condition or term of
the  Securities, and monies paid (if any)  pursuant to any contract of insurance
representing interest on the Securities) as it becomes payable, and credit  such
interest  to a  separate Interest Account  created by the  Indenture. All monies
received by the Trustee from sources other  than interest will be credited to  a
separate  Principal Account. All funds collected or received will be held by the
Trustee in trust without interest  to Unit Holders as part  of the Trust or  the
Reserve  Account (if  any) established  pursuant to  the Indenture  for taxes or
charges referred to herein,  until required to be  disbursed in accordance  with
the provisions of the Indenture.
    

DISTRIBUTION FROM THE INTEREST AND PRINCIPAL ACCOUNT

    Interest  and principal received by the  Trust, net of expenses and charges,
will be  distributed on  each Distribution  Date on  a pro  rata basis  to  Unit
Holders of record as of the preceding Record Date. All distributions will be net
of  applicable  expenses, funds  required for  the redemption  of Units  and, if
applicable, reimbursements to the Trustee for interest payments advanced to Unit
Holders discussed below. (See: "Summary of Essential Information", "Expenses and
Changes" and "Redemption".)

    The Trustee will credit to the Interest Account all interest received by the
Trust, including that part of the  proceeds of any disposition of securities  of
the Trust which represents accrued interest. All other receipts will be credited
to the Principal Account. The pro rata share of the Interest Account and the pro
rata  share of cash  in the Principal  Account represented by  each Unit will be
computed by the  Trustee each  month as  of the  Record Date.  (See "Summary  of
Essential  Information.") Proceeds received  from the disposition  of any of the
Securities subsequent  to  a  Record  Date and  prior  to  the  next  succeeding
Distribution  Date  will  be held  in  the  Principal Account  and  will  not be
distributed until  the following  Distribution Date.  The distribution  to  Unit
Holders  as of each Record Date will  be made on the following Distribution Date
or shortly thereafter  and shall  consist of  an amount  substantially equal  to
one-twelfth  of such Unit Holder's pro rata share of the estimated annual income
to the  Interest  Account  after  deducting  estimated  expenses  (the  "Monthly
Interest  Distribution")  plus such  Unit Holder's  pro rata  share of  the cash
balance in the Principal  Account computed as  of the close  of business on  the
preceding  Record Date. Persons who  purchase Units between a  Record Date and a
Distribution  Date  will  receive  their   first  distribution  on  the   second
Distribution Date following their purchase of

                                       10
<PAGE>
Units.  No distribution need be  made from the Principal  Account if the balance
therein is less  than an  amount sufficient to  distribute $.001  per Unit.  The
Monthly  Interest Distribution per  1,000 Units initially will  be in the amount
shown under "Summary of Essential Information" and will change as the income and
expenses of the Trust change and  as Securities are exchanged, redeemed,  mature
or sold.

    Normally,  interest payments on the Securities in the Portfolio of the Trust
which pay  interest are  made on  a semi-annual  basis. Therefore,  it may  take
several  months after the Date of Deposit  for the Trustee to receive sufficient
interest payments on the Securities  to begin monthly distributions of  interest
to  Unit Holders. Further, because interest payments on the Securities which pay
interest are not received by the Trust  at a constant rate throughout the  year,
any  Monthly Interest Distribution may be more  or less than the amount credited
to the  Interest Account  as  of a  Record Date.  In  order to  eliminate  these
fluctuations,  the  Trustee  is required  under  the Indenture  to  advance such
amounts as may be necessary to  provide Monthly Interest Distributions of  equal
amounts. The Trustee will be reimbursed, without interest, for any such advances
from funds available in the Interest Account on the next pursuing Record Date or
Record  Dates,  as  the  case  may be.  Funds  which  are  available  for future
distributions, payments of expenses  and redemptions are  in accounts which  are
non-interest  bearing to Unit Holders and are  available for use by the Trustee,
pursuant to normal banking procedures. In addition, because of varying  interest
payment  dates  of  the  Securities comprising  the  Trust's  Portfolio, accrued
interest at  any point  in time  will be  greater than  the amount  of  interest
actually  received by  the Trust  and distributed  to Unit  Holders. This excess
accrued but  undistributed interest  amount (the  "accrued interest  carryover")
will  be added to the value of the  Units on any purchase after the initial Date
of Deposit. If a Unit Holder sells or  redeems all or a portion of his Units,  a
portion of his sale proceeds will be allocable to his proportionate share of the
accrued interest carryover. Similarly, if a Unit Holder redeems all or a portion
of his Units, the Redemption Price per Unit which he is entitled to receive from
the Trustee will also include his accrued interest carryover on the Securities.

    The  Trust  has been  structured  so that  a  positive cash  balance  in the
Interest Account will be  available to pay the  current expenses and charges  of
the  Trust. Therefore, it is not anticipated  that the Trustee will have to sell
Securities  to   pay  such   expenses.  The   Trustee,  when   making   interest
distributions,  will  have previously  deducted  from the  Interest  Account the
expenses  and  charges  mentioned  above,  and  thus  will  distribute  on  each
Distribution  Date an amount which will be less than the interest accrued on the
Securities to each Unit Holder on or immediately prior to such Distribution Date
by amounts equal to the current expenses and charges of the Trust.

   
    The Trustee  has  agreed to  advance  to the  Trust  the amount  of  accrued
interest  due on  the Securities  in the  Portfolio from  their respective issue
dates or previous interest payment  dates through the first expected  settlement
date.  This accrued interest amount will be paid to the Sponsor as the holder of
record of all Units on such date. Consequently, when the Sponsor sells Units  of
a  Trust after the date of the Prospectus,  the amount of accrued interest to be
added to the Public Offering  Price of the Units  purchased by an investor  will
include  only accrued interest  from the first expected  settlement date to, but
not including, the date of settlement of the investor's purchase (normally  five
business days after purchase), less any distributions from the Interest Account.
Since  a person who  contracts to purchase  Units on the  date of the Prospectus
will settle such  purchase on the  first expected settlement  date of Units,  no
accrued  interest will be added  to the Public Offering  Price. The Trustee will
recover its advancements  to the Trust  (without interest or  other cost to  the
Trust) from interest received on the Securities deposited in the Trust.
    

REPORTS TO UNIT HOLDERS

    With each distribution from the Interest Account or Principal Account of the
Trust,  the Trustee will furnish to the  Unit Holders, a statement of the amount
being distributed, expressed in each case as a dollar amount per 1,000 Units. In
the event that the Issuer  of any of the Securities  fails to make payment  when
due  of any interest  or principal and such  failure results in  a change in the
amount which  would otherwise  be distributed  as a  periodic distribution,  the
Trustee will, with the first such distribution following such failure, set forth
in  an accompanying statement, the Issuer and  the Securities, the amount of the
reduction in  the  distribution  per  Unit  resulting  from  such  failure,  the
percentage  of  the  aggregate face  amount  of Securities  which  such Security
represents and,  to  the  extent  then  determined,  information  regarding  any
disposition  or legal action with respect  to such Security. Within a reasonable
period of time after the end of each  calendar year, but in no event later  than
February 15, the Trustee will furnish to each person who at any time during such
calendar year was a Unit Holder of record a statement setting forth:

        As  to  the Interest  Account: the  amount of  interest received  on the
    Securities and amounts representing penalties for the failure to make timely
    payments on  any of  the Securities  or liquidated  damages for  default  or
    breach of any condition or terms of any of the Securities (or any instrument
    underlying any of the Securities); the amount paid from the Interest Account
    upon the redemption of Units; the amounts paid from the Interest Account for
    purchase  of replacement Securities,  in the event that  the purchase of any
    Securities deposited in the Trust  was not consummated; the deductions  from
    the  Interest Account  for applicable  taxes, and  fees and  expenses of the
    Sponsor, the Trustee, the Evaluator and counsel; any other amounts  credited
    to or deducted from the Interest Account; and the net amount remaining after
    such  payments and deductions expressed both as a total dollar amount and as
    a dollar amount per 1,000 Units outstanding on the last business day of such
    calendar year.

        As  to  the  Principal  Account:  the  dates  of  the  sale,   maturity,
    liquidation  or redemption  of any  of the  Securities and  the net proceeds
    received therefrom and from the  prepayment of principal of the  Securities,
    excluding any portion credited to the Interest Account; the amount paid from
    the  Principal Account representing  Units which were  redeemed; the amounts
    paid from the Principal Account  for purchase of replacement Securities,  in
    the  event that the purchase of any  Security deposited in the Trust was not
    consummated; if  amounts  in the  Interest  Account were  insufficient,  the
    deductions  from the  Principal Account, if  any, for  payment of applicable
    taxes, fees

                                       11
<PAGE>
    and expenses of  the Sponsor,  the Trustee,  the Evaluator  and counsel;  if
    amounts  in the Interest Account were  insufficient, the deductions from the
    Principal Account for  any other amounts  credited to or  deducted from  the
    Interest  Account;  and the  net amount  remaining  after such  payments and
    deductions expressed both as  a total dollar amount  and as a dollar  amount
    per 1,000 Units outstanding on the last business day of such calendar year.

        The  following  information: a  list of  the Securities  as of  the last
    business day of such calendar year;  the number of Units outstanding on  the
    last  business day  of such  calendar year;  the Redemption  Price per 1,000
    Units based on the last Trust evaluation made during such calendar year; and
    the amounts actually distributed during such calendar year from the Interest
    and Principal Accounts,  separately stated, expressed  both as total  dollar
    amounts  and as  dollar amounts  per 1,000  Units outstanding  on the Record
    Dates for such distributions.

    In order to comply with tax reporting requirements, the Trustee will furnish
to Unit Holders, upon  request, evaluations of the  Securities as determined  by
the  Evaluator. The accounts of  the Trust shall be  audited not less frequently
than annually  by independent  certified public  accountants designated  by  the
Sponsor,  and the report of such accountants will be furnished by the Trustee to
Unit Holders upon request.

                                    SPONSOR

    Dean Witter Reynolds Inc. ("Dean  Witter") is a corporation organized  under
the  laws of the  State of Delaware  and is a  principal operating subsidiary of
Dean Witter, Discover  & Co., a  publicly-traded corporation. Dean  Witter is  a
financial  services  company that  provides  to its  individual,  corporate, and
institutional clients  services as  a broker  in securities  and commodities,  a
dealer in corporate, municipal, and government securities, an investment banker,
an  investment adviser, and an  agent in the sale  of life insurance and various
other products and services. Dean Witter is a member firm of the New York  Stock
Exchange,  the American Stock Exchange, the Chicago Board Option Exchange, other
major securities exchanges and the  National Association of Securities  Dealers,
and  is a clearing member of the  Chicago Board of Trade, the Chicago Mercantile
Exchange, the Commodity  Exchange Inc., and  other major commodities  exchanges.
Dean   Witter  is  currently   servicing  its  clients   through  a  network  of
approximately 375 domestic  and international offices  with approximately  7,500
account executives servicing individual and institutional client accounts.

LIMITATIONS ON LIABILITY

    The  Sponsor is liable  for the performance of  its obligations arising from
its responsibilities under the Indenture, but will be under no liability to Unit
Holders for taking any action or refraining from taking any action in good faith
or for errors in judgment or liable  or responsible in any way for  depreciation
or  loss incurred by reason of the sale of any Securities, except in case of its
own willful misfeasance, bad faith,  gross negligence or reckless disregard  for
its obligations and duties. (See: "Sponsor -- Responsibility.")

RESPONSIBILITY

    The  Trust is not  a managed registered  investment company. Securities will
not be sold by the Trustee to take advantage of ordinary market fluctuations.

    Although the Sponsor and the Trustee  do not presently intend to dispose  of
Securities,  the Indenture permits the Sponsor  to direct the Trustee to dispose
of Securities in the Trust for purposes  of redeeming tendered Units and to  pay
Trust expenses.

    Any remaining proceeds resulting from the disposition of any Security in the
Trust  will be distributed as  set forth under "Administration  of the Trust" to
the extent such remaining proceeds are not  needed to redeem Units or pay  Trust
expenses.

RESIGNATION

    If at any time the Sponsor shall resign under the Indenture or shall fail to
perform  or be  incapable of  performing its  duties thereunder  or shall become
bankrupt or if its affairs are  taken over by public authorities, the  Indenture
directs  that, if upon such action by the Sponsor there would be no Sponsor then
acting, the Trustee shall either (1) appoint a successor Sponsor or Sponsors  at
rates  of compensation  deemed reasonable by  the Trustee  not exceeding amounts
prescribed by  the Securities  and  Exchange Commission,  or (2)  terminate  the
Trust. The Trustee will promptly notify Unit Holders of any such action.

                                    TRUSTEE

   
    The Trustee is The Bank of New York, with its principal place of business at
48  Wall Street, New York, New York  10286, and its unit investment trust office
at 101 Barclay  Street, New  York, New York  10286. Unit  Holders should  direct
inquiries regarding distributions, address changes and other matters relating to
the administration of the Trust to Unit Investment Trust Division, P.O. Box 974,
Wall  Street Station, New York, New York  10268-0974. The Trustee is a member of
the New  York Clearing  House  Association and  is  subject to  supervision  and
examination by the Superintendent of Banks of the State of New York, the Federal
Deposit  Insurance Corporation and the Board of Governors of the Federal Reserve
System.
    

                                       12
<PAGE>
LIMITATIONS ON LIABILITY

    The Trustee shall not be liable  or responsible in any way for  depreciation
or  loss incurred  by reason  of the  disposition of  any moneys,  Securities or
Certificates or in respect  of any evaluation  or for any  action taken in  good
faith  reliance on  prima facie properly  executed documents except  in cases of
willful misfeasance, bad faith, gross  negligence or reckless disregard for  its
obligations  and duties.  In addition, the  Indenture provides  that the Trustee
shall not  be personally  liable for  any taxes  or other  governmental  charges
imposed upon or in respect of the Trust which the Trustee may be required to pay
under  current or future laws of the United States or any other authority having
jurisdiction.

RESPONSIBILITY

    For information relating to  the responsibilities of  the Trustee under  the
Indenture,  reference is  made to the  material set  forth under "Distribution,"
"Rights of Unit Holders" and "Sponsor -- Resignation."

RESIGNATION AND REMOVAL

    By executing an instrument in writing  and filing the same with the  Sponsor
and  mailing a  copy of  a notice  of resignation  to all  Unit Holders  then of
record, the Trustee and any successor may  resign. In such an event the  Sponsor
is  obligated to appoint a successor trustee as soon as possible. If the Trustee
becomes incapable of acting or becomes bankrupt or its affairs are taken over by
public authorities,  or upon  the determination  of the  Sponsor to  remove  the
Trustee for any reason, either with or without cause, the Sponsor may remove the
Trustee  and appoint a successor as  provided in the Indenture. Such resignation
or removal shall  become effective  upon the  acceptance of  appointment by  the
successor  trustee.  If upon  resignation  of a  trustee  no successor  has been
appointed or, if appointed, has not accepted the appointment within thirty  days
after  notification,  the retiring  trustee may  apply to  a court  of competent
jurisdiction for the appointment of a successor. The resignation or removal of a
trustee  becomes  effective  only  when   the  successor  trustee  accepts   its
appointment  as  such  or when  a  court  of competent  jurisdiction  appoints a
successor trustee.

                                   EVALUATOR

    The Evaluator  is  Kenny  S&P  Evaluation  Services,  a  division  of  Kenny
Information  Systems, Inc., with main offices  located at 65 Broadway, New York,
New York 10006.

LIMITATIONS ON LIABILITY

    The Trustee, Sponsor and Unit Holders  may rely on any evaluation  furnished
by  the Evaluator  and shall  have no  responsibility for  the accuracy thereof.
Determinations by the Evaluator under the Indenture shall be made in good  faith
upon  the basis of the best information  available to it. The Evaluator shall be
under no liability to the  Trustee, the Sponsor, or  Unit Holders for errors  in
judgment, except in cases of willful misfeasance, bad faith, gross negligence or
reckless disregard of its obligations and duties.

RESPONSIBILITY

    The Indenture requires the Evaluator to evaluate the Securities in the Trust
on  the basis of their bid prices on  the last business day of June and December
in each year, on the day on which any Unit is tendered for redemption and on any
other day such  evaluation is  desired by  the Trustee  or is  requested by  the
Sponsor.  In  addition, the  Indenture requires  the  Evaluator to  evaluate the
Securities in the Trust on the basis of their offering price on certain business
days during the initial public offering period and on any other day requested by
the Sponsor or Trustee.  For information relating to  the responsibility of  the
Evaluator  to evaluate  the Securities  on the  basis of  their offering  or bid
prices as appropriate, see "Public Offering of Units -- Public Offering Price."

RESIGNATION

    The Evaluator may resign or may be removed by the Sponsor, and in such event
the Sponsor  and  the  Trustee are  to  use  their best  efforts  to  appoint  a
satisfactory  successor. Such resignation or removal shall become effective upon
the acceptance of appointment by a  successor evaluator. If upon resignation  of
the  Evaluator no  successor has accepted  appointment within  thirty days after
notice of  resignation,  the  Evaluator  may  apply  to  a  court  of  competent
jurisdiction for the appointment of a successor.

                   AMENDMENT AND TERMINATION OF THE INDENTURE

AMENDMENT

    The  Indenture  may be  amended from  time  to time  by the  parties thereto
without the consent of any  of the Unit Holders when  such an amendment is  made
(1)  to cure  any ambiguity  or to  correct or  supplement any  provision of the
Indenture which  may  be defective  or  inconsistent with  any  other  provision
contained therein, (2) to change any provision as required by the Securities and
Exchange Commission, or (3) to make such other provisions as shall not adversely
affect  the interests of the Unit Holders; provided, that the Indenture may also
be amended by  the Sponsor and  the Trustee (or  the performance of  any of  the
provisions  of the  Indenture may  be waived) with  the consent  of Unit Holders
owning

                                       13
<PAGE>
51% of the Units of the Trust at the time outstanding for the purposes of adding
any provisions to or changing in any manner or eliminating any of the provisions
of the Indenture or of modifying in any manner the rights of Unit Holders. In no
event, however, shall the Indenture be  amended to increase the number of  Units
issuable  thereunder or  to permit the  deposit or acquisition  of securities or
other property  either  in  addition  to  or in  substitution  for  any  of  the
Securities initially deposited in the Trust, except as initially provided in the
Indenture  or to  provide the Trustee  with the  power to engage  in business or
investment activities not specifically authorized in the Indenture as originally
adopted or so  as to adversely  affect the  characterization of the  Trust as  a
grantor  trust for federal income  tax purposes. In the  event of any amendment,
the Trustee  is obligated  to notify  all Unit  Holders promptly  regarding  the
substance of such amendment.

TERMINATION

    The Trust may be terminated at any time by the consent of the holders of 51%
of  the  Units  or  upon  the  maturity,  redemption,  payment,  sale  or  other
disposition, as  the case  may  be, of  the last  Security  held in  the  Trust.
However,  in no  event may the  Trust continue beyond  the Mandatory Termination
Date set forth under Part A -- "Summary of Essential Information." In the  event
of  termination, written notice thereof will be  sent by the Trustee to all Unit
Holders. Within a reasonable period after termination, the Trustee will sell any
Securities remaining in the terminated Trust and, after paying all expenses  and
charges  incurred  by  the Trust,  will  distribute  to each  Unit  Holder, upon
surrender for cancellation of his Certificate  for Units, his pro rata share  of
the  balances  remaining in  the Interest  and Principal  Accounts. The  sale of
Securities in the Trust upon termination may result in a lower amount than might
otherwise be realized  if such sale  were not  required at such  time. For  this
reason,  among others, the amount realized by a Unit Holder upon termination may
be less than the principal amount of Securities represented by the Units held by
such Unit Holder.

                                 LEGAL OPINIONS

    Certain legal matters in connection with the Units offered hereby have  been
passed  upon by Cahill Gordon &  Reindel, a partnership including a professional
corporation, 80 Pine Street,  New York, New York  10005, as special counsel  for
the Sponsor.

                                    AUDITORS

   
    The  financial statements of the Trust included in this Prospectus have been
audited by Deloitte & Touche, certified  public accountants, as stated in  their
report  appearing herein,  and are included  in reliance upon  such report given
upon the authority of that firm as experts in accounting and auditing.
    

                            DESCRIPTION OF RATING *

    A Standard & Poor's Corporation rating  on the units of an investment  trust
(hereinafter  referred  to  collectively as  "units"  and "fund")  is  a current
assessment of  creditworthiness with  respect to  the investments  held by  such
fund.  This assessment  takes into consideration  the financial  capacity of the
issuers and of any guarantors, insurers, lessees, or mortgagors with respect  to
such investments. The assessment, however, does not take into account the extent
to  which  fund expenses  or  portfolio asset  sales  for less  than  the fund's
purchase price  will reduce  payment to  the  Unit Holder  of the  interest  and
principal  required to be paid on the  portfolio assets. In addition, the rating
is not a recommendation to purchase, sell, or hold units, inasmuch as the rating
does not comment as to market price of the units or suitability for a particular
investor.

    Funds rated "AAA" are composed exclusively of assets that are rated "AAA" by
Standard &  Poor's  and/or certain  short-term  investments. Standard  &  Poor's
defines  its  AAA rating  for  such assets  as  the highest  rating  assigned by
Standard &  Poor's to  a debt  obligation. Capacity  to pay  interest and  repay
principal is very strong.

- ---------
*As described by Standard & Poor's Corporation.

                                       14
<PAGE>
- ----------------------------------- Sponsor: -----------------------------------
                    (DEAN WITTER REYNOLDS INC. LOGO)
               Two World Trade Center - New York, New York 10048
- --------------------------------------------------------------------------------
                                                                           37684
<PAGE>

                      CONTENTS OF REGISTRATION STATEMENT

            This registration statement comprises the following docdocuments:

            The facing sheet.
            The Cross-reference Sheet.
            The Prospectus.
            The signatures.
            Written consents of the following persons:

                  -Cahill Gordon & Reindel (included in Exhibit 5)
                  -Deloitte & Touche
                  -Kenny S&P Evaluation Services, a division of
                   Kenny Information Systems, Inc., as Evaluator
                  -Standard & Poor's Corporation

The following exhibits:


*   EX-3(a)   Certificate of Incorporation of Dean Witter Reynolds Inc.

*   EX-3(b)   By-laws of Dean Witter Reynolds Inc.
   
    EX-4.1    Trust Indenture and Agreement, dated March 16, 1994

    EX-4.2    Reference Trust Agreement, dated March 16, 1994
    
    EX-4.3    Form of Certificate of Beneficial Interest (included in Trust
               Indenture and Agreement)

    EX-5      Opinion of counsel as to legality of securities being
               registered

    EX-23.1   Consent of Independent Auditors

    EX-23.2   Consent of Kenny S&P Evaluation Services

    EX-23.3   Consent of Standard & Poor's Ratings Group

    EX-23.4   Consent of Cahill Gordon & Reindel (included in Exhibit 5)

    EX-99     Information as to Officers and Directors of Dean Witter
               Reynolds Inc. is incorporated by reference to Schedule A and D
               of Form BD filed by Dean Witter Reynolds Inc. pursuant to Rule
               15b1-1 and 15b3-1

____________________

*     Incorporated by reference to the same exhibit in the Registration
      Statement of Series Tax-Exempt Investment Trust, Insured Long
      Term Series 33 and Long Term Municipal Portfolio Series 106,
      Registration Numbers 33-38086 and 33-37629, respectively.
<PAGE>

               under the Securities Exchange Act of 1934 (1934 Act File No.
               8-14171).













<PAGE>

                                  SIGNATURES
   
      The Registrant, Dean Witter Select Government Trust, U.S. Treasury
Series 7, hereby identifies the Sears Government Investment Trust, U.S.
Treasury Series 1 and Freddie Mac Portfolio Series 3 of the Trust for the
purposes of the representations required by Rule 487 and represents the
following:

      1)   That the portfolio securities deposited in the series
            as to the securities of which this registration
            statement is being filed do not differ materially in
            the type or quality from those deposited in such
            previous series;

      2)   That, except to the extent necessary to identify the
            specific portfolio securities deposited in, and to
            provide essential financial information for, the series
            with respect to the securities of which this
            registration statement is being filed, this
            registration statement does not contain disclosure
            that differs in any material respect from that
            contained in the registration statement for such
            previous series as to which the effective date was
            determined by the Commission or the staff;

      3)    That it has complied with Rule 460 under the Securities
            Act of 1933.
    





<PAGE>
   
      Pursuant to the requirements of the Securities Act of 1933, as amended,
the registrant, Dean Witter Select Government Trust, U.S. Treasury Series 7,
has duly caused this Amendment No. 1 to the Registration Statement to be
signed on its behalf by the undersigned, thereunto duly authorized, all in the
City of New York and State of New York on the 16th day of March, 1994.
    

                                    DEAN WITTER SELECT GOVERNMENT TRUST, U.S.
                                    TREASURY SERIES 7
                                    (Registrant)

                                    By: Dean Witter Reynolds Inc. (Depositor)

                                    Michael D. Browne
                                    Authorized Signatory

            Pursuant to the requirements of the Securities Act of 1933, this
Amendment No. 1 to the Registration Statement has been signed on behalf of
Dean Witter Reynolds Inc., the Depositor, by the following persons in the
following capacities and by the following persons who constitute a majority of
the Depositor's Board of Directors in the City of New York, and State of New
York, on this 16th day of March, 1994.

DEAN WITTER REYNOLDS INC.

       Name                    Office
      ------                  --------

Philip J. Purcell        Chairman & Chief          )
                         Executive Officer*        )

Thomas C. Schneider      Executive Vice            )
                     President and Chief           )
                         Financial Officer         )

                                                   By

                                                   Michael D. Browne
                                                   Attorney-in-fact*

_____________________

*     Executed copies of the Powers of Attorney have been filed with the
      Securities and Exchange Commission in connection with the Registration
      Statement on Form S-6 for Sears Tax-Exempt Investment Trust, Long Term
      Municipal Portfolio Series 96, File No. 33-32860.







<PAGE>

 Name                                      Office
- ------                                    --------

Richard M. DeMartini                      Director*
Nancy S. Donovan                          Director*
Charles A. Fiumefreddo                    Director*
James S. Higgins                          Director*
Stephen R. Miller                         Director*
Richard F. Powers                         Director*
Philip J. Purcell                         Director*
Thomas C. Schneider                       Director*
William B. Smith                          Director*
Robert E. Wood, II                        Director*



_____________________

*     Executed copies of the Powers of Attorney have been filed with the
      Securities and Exchange Commission in connection with the Registration
      Statement on Form S-6 for Sears Tax-Exempt Investment Trust, Long Term
      Municipal Portfolio Series 96, File No. 33-32860.






<PAGE>

                                EXHIBIT INDEX
                                      TO
                                   FORM S-6
                            REGISTRATION STATEMENT
                       UNDER THE SECURITIES ACT OF 1933

EXHIBIT NO.              TITLE OF DOCUMENT
- ------------            -------------------

*   EX-3(a)   Certificate of Incorporation of Dean Witter Reynolds Inc.

*   EX-3(b)   By-laws of Dean Witter Reynolds Inc.

    EX-4.1    Trust Indenture and Agreement, dated March 16, 1994

    EX-4.2    Reference Trust Agreement, dated March 16, 1994

    EX-4.3    Form of Certificate of Beneficial Interest (included in Trust
               Indenture and Agreement)

    EX-5      Opinion of counsel as to legality of securities being
               registered

    EX-23.1   Consent of Independent Auditors

    EX-23.2   Consent of Kenny S&P Evaluation Services

    EX-23.3   Consent of Standard & Poor's Ratings Group

    EX-23.4   Consent of Cahill Gordon & Reindel (included in Exhibit 5)

    EX-99     Information as to Officers and Directors of Dean Witter
               Reynolds Inc. is incorporated by reference to Schedule A and D
               of Form BD filed by Dean Witter Reynolds Inc. pursuant to Rule
               15b1-1 and 15b3-1 under the Securities Exchange Act of 1934
               (1934 Act File No. 8-14171).


____________________

*     Incorporated by reference to the same exhibit in the Registration
      Statement of Series Tax-Exempt Investment Trust, Insured Long
      Term Series 22 and Long Term Municipal Portfolio Series 106,
      Registration Numbers 33-38086 and 33-37629, respectively.


<PAGE>


______________________________________________________________
______________________________________________________________


                     DEAN WITTER SELECT GOVERNMENT TRUST

                        TRUST INDENTURE AND AGREEMENT

                for all series formed on or subsequent to the
                        effective date specified below


                                    Among



                          DEAN WITTER REYNOLDS INC.

                                 As Depositor

                                   THE BANK
                                 OF NEW YORK

                                  As Trustee

                 KENNY S & P EVALUATION SERVICES, a division
                      of KENNY INFORMATION SYSTEMS, INC.

                                 As Evaluator


                           ________________________


                            Dated:  March 16, 1994

______________________________________________________________
______________________________________________________________






<PAGE>

                       TRUST INDENTURE AND AGREEMENT



                                 CONTENTS



      Article and Section                                               Page

PREAMBLES ................................................................ 1

      Form of Certificates ............................................... 3

ARTICLE I -- DEFINITIONS ................................................. 8

ARTICLE II -- DEPOSIT OF SECURITIES; ACCEPTANCE OF TRUST;
      ISSUANCE OF UNITS; FORM OF CERTIFICATES ........................... 13

      Sec. 2.01.        Deposit of Securities ........................... 12
      Sec. 2.02.        Acceptance of Trust ............................. 14
      Sec. 2.03.        Issue of Units .................................. 14
      Sec. 2.04.        Form of Certificates ............................ 15

ARTICLE III -- ADMINISTRATION OF TRUST .................................. 15

      Sec. 3.01.        Initial Costs ................................... 15
      Sec. 3.02.        Interest Account ................................ 16
      Sec. 3.03.        Principal Account ............................... 16
      Sec. 3.04.        Reserve Account ................................. 16
      Sec. 3.05.        Distribution .................................... 17
      Sec. 3.06.        Distribution Statements ......................... 21
      Sec. 3.07.        Sale of Bonds ................................... 24
      Sec. 3.08.        Refunding Bonds ................................. 25
      Sec. 3.09.        Bond Counsel .................................... 26
      Sec. 3.10.        Notice and Sale by Trustee ...................... 26
      Sec. 3.11.        Trustee Not To Amortize ......................... 27
      Sec. 3.12.        Notice to Depositor ............................. 27
      Sec. 3.13.        Sale of Deposited Units ......................... 27
      Sec. 3.14.        Replacement Bond ................................ 28

ARTICLE IV -- EVALUATION OF SECURITIES;
EVALUATOR ............................................................... 29


      Sec. 4.01.        Evaluation by Evaluator ......................... 29
      Sec. 4.02.        Tax Reports ..................................... 30
      Sec. 4.03.        Evaluator's Compensation ........................ 30
      Sec. 4.04.        Liability of Evaluator .......................... 30
      Sec. 4.05.        Successor Evaluator ............................. 30
                                    -i-


<PAGE>

      Article and Section                                               Page

ARTICLE V -- TRUST EVALUATION; REDEMPTION, PURCHASE,
      TRANSFER, INTERCHANGE OR REPLACEMENT OF
      CERTIFICATES ...................................................... 32

      Sec. 5.01.        Trust Evaluation ................................ 32
      Sec. 5.02.        Redemptions by Trustee; Purchases
                        by Depositor .................................... 33
      Sec. 5.03.        Transfer or Interchange of
                        Certificates .................................... 35
      Sec. 5.04.        Certificates Mutilated, Destroyed,
                        Stolen or Lost .................................. 36

ARTICLE VI -- TRUSTEE ................................................... 37

      Sec. 6.01.        General Definition of
                        Trustee's Liabilities, Rights and
                        Duties .......................................... 37
      Sec. 6.02.        Books, Records and Reports ...................... 41
      Sec. 6.03.        Indenture and List of Securities
                        on File ..........................................41
      Sec. 6.04.        Compensation .................................... 42
      Sec. 6.05.        Removal and Resignation of
                        Trustee; Successor .............................. 43
      Sec. 6.06.        Qualifications of Trustee ....................... 46

ARTICLE VII -- RIGHTS OF UNIT HOLDERS ................................... 46

      Sec. 7.01.        Beneficiaries of Trust .......................... 46
      Sec. 7.02.        Rights, Terms and Conditions .....................46

ARTICLE VIII -- DEPOSITOR ............................................... 47

      Sec. 8.01.        Liabilities; Power of Attorney .................. 47
      Sec. 8.02.        Discharge ....................................... 48
      Sec. 8.03.        Successors ...................................... 50
      Sec. 8.04.        Resignation ..................................... 50
      Sec. 8.05.        Additional Depositors ........................... 51
      Sec. 8.06.        Exclusions from Liability ....................... 51
      Sec. 8.07.        Compensation .................................... 52

ARTICLE IX -- ADDITIONAL COVENANTS; MISCELLANEOUS
      PROVISIONS ........................................................ 53

      Sec. 9.01.        Amendments ...................................... 53
      Sec. 9.02.        Termination ..................................... 54
      Sec. 9.03.        Construction .................................... 56
      Sec. 9.04.        Written Notice .................................. 56
      Sec. 9.05.        Severability .................................... 56
                                    -ii-


<PAGE>

      Article and Section                                               Page

      Sec. 9.06.        Dissolution of Depositors Not To
                        Terminate ....................................... 57

EXECUTION ................................................................ *

ACKNOWLEDGMENTS .......................................................... *



                          ______________________


This Table of Contents does not constitute part of the Indenture.






_________________________
* See Applicable Reference Trust Agreement.


                                   -iii-


<PAGE>

            TRUST INDENTURE AND AGREEMENT dated March 16, 1994 among DEAN
WITTER REYNOLDS INC. as Depositor, and THE BANK OF NEW YORK as Trustee, and
KENNY S & P EVALUATION SERVICES, a division of KENNY INFORMATION SYSTEMS,
INC., as Evaluator.

            WITNESSETH that:

            WHEREAS, it is desired to expand the market for certain
Securities issued by the United States Government, and agencies thereof or
other similar entities, some of which Securities, as individual issues or
parts thereof, might be unavailable or impracticable as investments to
certain individual investors, and to provide proper diversification to such
investors, particularly those with limited investment capital; and

            WHEREAS, the Depositor desires to provide for the collection
and distribution of the principal of and interest on such Securities by the
Trustee to such persons as shall purchase an interest therein, as
hereinafter provided; and

            WHEREAS, the Depositor, the Trustee and the Evaluator are
entering into this Trust Indenture and Agreement for the purpose of
establishing certain of the terms, covenants and conditions of the Dean
Witter Select Government Trust created on March 16, 1994, and each
subsequent Series which may be established from time to time after the date
hereof, incorporating by reference the terms hereof; and

            WHEREAS, for the Dean Witter Select Government Trust, and each
subsequent Series of the Dean Witter Select Government Trust, to which this
Trust Indenture and Agreement is applicable, the Depositor, the Trustee,
and the Evaluator shall execute a separate Reference Trust Agreement
incorporating by reference this Trust Indenture and Agreement and effecting
any amendment, supplement or variation from or to such incorporation by
reference with respect to the related series, and specifying for that
series:  (1) the Bonds and Deposited Units (if any) deposited in trust and
the number of Units delivered by the Trustee in exchange for the Bonds and
Deposited Units (if any) pursuant to Section 2.03; (2) the initial
fractional undivided interest represented by each Unit in each Trust;
(3) the First Settlement Date; (4) the first and subsequent Distribution
Dates; (5) the first and subsequent Record Dates; (6) the name of the
Depositor; (7) the amount of the first distribution to Unit Holders of
record as of the first Record Date; (8) the Depositor's fee; (9) the
Trustee's





<PAGE>

                                    -2-



annual fee; (10) the Evaluator's fee; (11) the Termination Date; and
(12) any other change or addition contemplated or permitted by this Trust
Indenture and Agreement; and

            WHEREAS, the Depositor will acquire and, concurrently with the
execution and delivery of the appropriate Reference Trust Agreement, will
deposit in trust with the Trustee the Bonds and the units of prior Series
of the Dean Witter Select Government Trust, if any, to be listed in the
Schedule thereto, all to be held by the Trustee in trust upon the terms and
conditions hereinafter set forth as amended, supplemented or varied by such
Reference Trust Agreement, for the use and benefit of all registered
holders of units of fractional undivided interest in the Trust to which
such Reference Trust Agreement relates; and

            WHEREAS, concurrently with the receipt of the aforesaid
deposit, the Trustee will record on its books the ownership by the
Depositor thereof of units of fractional undivided interest in such Bonds
and such units of prior series of the Dean Witter Select Government Trust
and in the Interest Account and the Principal Account maintained under this
Indenture in the manner hereinafter provided (which units of fractional
undivided interest so recorded respectively will represent in the aggregate
100% of the beneficial interest established hereby in such Bonds, units of
prior series of the Dean Witter Select Government Trust, Interest Account
and Principal Account) and will execute in the name of the Depositor
thereof certificates representing the ownership of the aggregate number of
Units specified in such Reference Trust Agreement (hereinafter called the
"Certificates"), and will deliver said Certificates to or upon the order of
the Depositor; and

            WHEREAS, the form of the Certificates shall be substantially as
follows:








<PAGE>

                                    -3-



No. ______________                                       ____________ Units
                         CERTIFICATE OF OWNERSHIP

                              --evidencing--

                           An Undivided Interest

                                --in the--

                    DEAN WITTER SELECT GOVERNMENT TRUST


                                                               CUSIP
                                                             ____________
                                                            /___________/


            This is to certify that                     is the owner and
registered holder of this Certificate evidencing the ownership of
           unit(s) of undivided interest in the Series of DEAN WITTER
SELECT GOVERNMENT TRUST that is specified on the face hereof (hereinafter
called the "Trust").  The Trust was created by the Trust Indenture and
Agreement applicable to this Series of Dean Witter Select Government Trust,
as amended, supplemented or varied by the Reference Trust Agreement
applicable to this Series of Dean Witter Select Government Trust (such
Trust Indenture and Agreement as amended, supplemented or varied by such
Reference Trust Agreement being hereafter called the "Indenture"), among
Dean Witter Reynolds Inc. (hereinafter called the "Depositor"), The Bank of
New York (hereinafter called the "Trustee") and the evaluator specified in
the Indenture.  The Trust consists of (1) such of the securities and Units
of preceding Series of Dean Witter Select Government Trust, if any,
deposited in trust and listed in the Schedule to the Reference Trust
Agreement relating to the Trust, and such of the Additional Securities as
are supplementally deposited in the Trust, if any, and any other securities
that may be deposited in the Trust in accordance with the Indenture, as may
from time to time continue to be held as part of the Trust and (2) such
cash amounts as from time to time may be held in certain accounts of the
Trust as provided in the Indenture.

            This Certificate is issued under and is subject to the terms,
provisions and conditions of the Indenture.  The holder of this
Certificate, by virtue of the acceptance hereof, assents to and shall be
bound by the terms of the Indenture, a




<PAGE>

                                    -4-



copy of which is on file and available for inspection at the unit
investment trust office of the Trustee, to which reference is made for all
the terms, conditions and covenants thereof.

            The registered holder of this Certificate is entitled at any
time upon tender of this Certificate to the Trustee at its unit investment
trust office in the City of New York, and upon payment of any tax or other
governmental charges, to receive, on the seventh calendar day following the
day on which such tender is made, or, if such calendar day is not a
business day, on the first business day prior to such calendar day, an
amount in cash equal to the evaluation of the fractional undivided interest
in the Trust evidenced by this Certificate, upon the basis provided for in
the Indenture.  The right of redemption may be suspended and the date of
payment may be postponed for any period during which the New York Stock
Exchange is closed or trading on that Exchange is restricted, for any
period during which an emergency exists so that disposal of the securities
held in the Trust is not reasonably practicable or it is not reasonably
practicable to determine fairly the value of such securities, or for such
other periods as the Securities and Exchange Commission may by order
permit.

            This Certificate shall be transferable by the registered holder
hereof by presentation and surrender hereof at the unit investment trust
office of the Trustee properly endorsed or accompanied by a written
instrument or instruments of transfer in form satisfactory to the Trustee
and executed by the registered holder hereof or his authorized attorney.
Certificates of the Trust are interchangeable for one or more Certificates
in an equal aggregate number of units of undivided interest in the Trust at
the unit investment trust office of the Trustee, in denominations of a
single unit of undivided interest or any multiple thereof.

            The holder hereof may be required to pay a charge as provided
in the Indenture per Certificate issued in connection with the transfer or
interchange of this Certificate and any tax or other governmental charge
that may be imposed in connection with the transfer, interchange or other
surrender of this Certificate.

            The Trust shall terminate upon the maturity, redemption, sale
or other disposition of the last security held therein, provided, however,
that in no event shall the Indenture and the Trust continue beyond the date
set forth in  Part II of the Reference Trust Agreement.  The Indenture also






<PAGE>

                                    -5-



provides that the Trust may be terminated at any time by the written
consent of the holders of 51% of the units of undivided interest in the
Trust and under certain circumstances which include a decrease in the value
of the securities held in the Trust to less than an amount specified in the
Indenture.  Upon any termination the Trustee shall fully liquidate the
securities then held, if any, and distribute pro rata the funds then held
in the Trust upon surrender of the Certificates, all in the manner provided
in the Indenture.  Upon termination, the Trustee shall be under no further
obligation with respect to the Trust, except to hold the funds in trust
without interest until distribution as aforesaid and shall have no duty
upon any such termination to communicate with the holder hereof other than
by mail at the address of such holder appearing in the registration books
of the Trustee.

            This Certificate shall not become valid or binding for any
purpose until properly executed by the Trustee under the Indenture.

            IN WITNESS WHEREOF, Dean Witter Reynolds Inc. has caused this
Certificate to be executed in facsimile by an authorized officer; and The
Bank of New York, as Trustee, has caused this Certificate to be executed in
its corporate name by an authorized officer.

Dated:








<PAGE>

                                    -6-



                                    DEAN WITTER REYNOLDS INC.
                                      DEPOSITOR


                                    By
                                            Authorized Officer



                                    THE BANK OF NEW YORK,
                                      TRUSTEE


                                    By
                                            Authorized Officer








<PAGE>

                                    -7-



            The following abbreviations, when used in the inscription on
the face of the certificate, shall be construed as though they were written
out in full according to applicable laws or regulations:

TEN COM as tenants in common        UNIF GIFT MIN ACT ...Custodian..
                                            (Cust)     (Minor)
TEN ENT as tenants by the entireties           under Uniform
                                             Gifts to Minors
JT TEN as joint tenants with right                Act...........
       of survivorship and not as                 (State)
       tenants in common


      Additional abbreviations may also be used though not in the above
list.


                            FORM OF ASSIGNMENT

                                          PLEASE INSERT SOCIAL
                                          SECURITY OR OTHER
                                          IDENTIFYING NUMBER
                                          OF ASSIGNEE


            For Value Received                       hereby sells, assigns
and transfers unto                       the within Certificate and does
hereby irrevocably constitute and appoint                       attorney,
to transfer the within Certificate on the books of the Trustee, with full
power of substitution in the premises.


Date:




                                    NOTICE:  the signature to this assignment
                                    must correspond with the name as written
                                    upon the face of the Certificate without
                                    alteration or enlargement or any change
                                    whatever.





<PAGE>

                                    -8-



            NOW, THEREFORE, in consideration of the premises and of the mutual
agreements herein contained, the Depositor, the Trustee and the Evaluator
agree as follows:


                                  ARTICLE I

                                 Definitions

            Section 1.01  Whenever used in this Indenture the following words
and phrases, unless the context clearly indicates otherwise, shall have the
following meanings:

            (1)   "Additional Securities" shall mean such Securities (as
      defined herein) as are listed in schedules to a Supplemental
      Indenture and which are deposited in connection with an increase in
      the number of Units initially specified in an Indenture.

            (2)   "Additional Deposited Units" shall mean such Deposited
      Units (as defined herein) as are listed in schedules to a
      Supplemental Indenture and which are deposited in connection with an
      increase in the number of Units initially specified in an Indenture.

            (3)   "Additional Units" shall mean such Units (as defined
      herein) as are issued in respect of Additional Securities.

            (4)   "Basic Agreement" shall mean this Trust Indenture and
      Agreement dated March   , 1994 as originally executed, or if amended
      as hereinafter provided, as so amended, exclusive of the terms
      contained in any related Reference Trust Agreement.

            (5)   "Bonds" shall mean such of the interest-bearing and zero
      coupon obligations, including "when, as and if issued" and/or
      "regular way" contracts, if any, for the purchase of certain bonds,
      and a certified check or checks and/or an irrevocable letter or
      letters of credit in the amount required for such purchase, deposited
      in irrevocable trust and listed in the Schedule to the Reference
      Trust Agreement and Supplementary Reference Trust Agreement, and any
      obligations received in exchange, substitution or replacement for
      such obligations pursuant to Sections 3.08 and 3.14 hereof, as may
      from time to time continue to be held as a part of the Trust to which
      such





<PAGE>

                                    -9-



      Reference Trust Agreement and Supplementary Reference Trust
      Agreements relate.

            (6)   "Business Day" shall mean any day other than a Saturday
      or Sunday or, in the City of New York, a legal holiday, or a day on
      which banking institutions are authorized by law to close.

            (7)   "Certificate" shall mean any one of the certificates
      executed by the Trustee and the Depositor evidencing ownership of an
      undivided fractional interest in the Trust.

            (8)   "Contract Securities" shall mean Bonds which are to be
      acquired by the Trust pursuant to contracts, including (i) Bonds
      listed in the Schedule to the Reference Trust Agreement and
      Supplemental Schedules thereto and (ii) Bonds which the Depositor has
      contracted to purchase for the Trust pursuant to Section 3.14.

            (9)   "Deposited Units" shall mean such of the units of
      preceding series of Dean Witter Select Government Trust, if any,
      deposited in irrevocable trust and listed in the Schedule to the
      Reference Trust Agreement and on any Supplemental Schedules thereto,
      as may from time to time continue to be held as a part of the Trust
      to which such Reference Trust Agreement relates.

            (10)  "Depositor" of the Trust shall have the meaning assigned
      to it in Part II of the Reference Trust Agreement.

            (11)  "Depositor's Special Distribution" shall have the meaning
      assigned to it in Section 3.05 hereof.

            (12)  "Distribution Date" of a Trust shall have the meaning
      assigned to it in Part II of the Reference Trust Agreement relating
      to such Trust.

            (13)  "Evaluation Time" shall mean the time set forth under
      Summary of Essential Information in a prospectus for a Trust.

            (14)  "Evaluator" shall mean Kenny S & P Evaluation Services, a
      division of Kenny Information Systems, Inc., or any corporation into
      which such firm may be merged or with which it may be consolidated,
      or any corporation






<PAGE>

                                   -10-



      resulting from any merger or consolidation to which such firm shall
      be a party, or any firm succeeding to all or substantially all of the
      business of such firm; or any successor evaluator as hereinafter
      provided for.

            (15)  "First Settlement Date" of the Trust shall have the
      meaning assigned to it in Part II of the Reference Trust Agreement
      relating to such Trust.

            (16)  "Indenture" shall mean the Basic Agreement, as further
      amended, supplemented or varied by the Reference Trust Agreement.

            (17)  "Record Date" of a Trust shall have the meaning assigned
      to it in Part II of the Reference Trust Agreement relating to such
      Trust.

            (18)  "Reference Trust Agreement" shall mean a supplement to
      the Basic Agreement, the purpose of which shall be to amend,
      supplement and/or vary certain of the terms contained in the Basic
      Agreement.  Each Reference Trust Agreement, together with the Basic
      Agreement to the extent that such Reference Trust Agreement
      incorporates it by reference, defines all the terms, rights and
      duties relevant to the series of Dean Witter Select Government Trust,
      to which such Reference Trust Agreement relates.

            (19)  "Reinvestment Programs" shall mean the programs, if any,
      for reinvestment of principal and interest payments payable to a Unit
      Holder pursuant to the particular Prospectus relating to such Units
      of a Trust or pursuant to any other prospectus or offering memorandum
      referred to in the Prospectus or in the Indenture.

            (20)  "Replacement Bond" shall mean a Bond purchased by the
      Trustee pursuant to Section 3.14 hereof.

            (21)  "Securities" shall mean both the Bonds and the Deposited
      Units, if any, deposited in trust and listed on a schedule attached
      to the Reference Trust Agreement and on any Supplemental Schedule
      thereto.

            (22)  "Special Bond" shall have the meaning assigned to it in
      Section 3.14 hereof.

            (23)  "Supplemental Indenture" shall mean an amendment or
      supplement to the Indenture executed pursuant to



<PAGE>

                                   -11-



      Section 2.01 hereof for the purpose of making additional deposits of
      Securities in the Trust and issuing a corresponding amount of
      additional units.

            (24)  "Termination Date" shall mean the date set forth in
      Part II of the Reference Trust Agreement.

            (25)  "Trust" shall mean the trust created by this Indenture
      (including the separate, respective trusts mentioned in a Reference
      Trust Agreement), which trust shall be denominated as indicated in
      Part II of the Reference Trust Agreement relating to such Trust and
      which shall consist of the Securities held pursuant and subject to
      this Indenture together with all undistributed interest received or
      accrued thereon, and any undistributed cash held in the Interest and
      Principal Accounts realized from the sale, redemption, liquidation,
      or maturity of the Bonds, the Deposited Units, if any, or the
      underlying obligations held in those series of Dean Witter Select
      Government Trust to which the Deposited Units relate.

            (26)  "Trustee" shall mean The Bank of New York, or any
      successor trustee as hereinafter provided for.

            (27)  "Unit" with respect to the Trust shall represent a
      fractional undivided interest in and ownership of the Trust initially
      equal to the fraction specified for the Trust in Part II of the
      Reference Trust Agreement relating to the Trust.  From time to time,
      the denominator of each of these fractions shall be decreased by the
      number of any such Units redeemed as provided in Section 5.02 hereof
      and increased by the number of Additional Units created pursuant to
      Section 2.05 hereof.

            (28)  "Unit Holder" shall mean the registered holder of any
      Unit as recorded on the books of the Trustee, his legal
      representatives and heirs and the successors of any corporation,
      partnership or other legal entity which is a registered holder of any
      Unit and as such shall be deemed a beneficiary of the Trust created
      by this Indenture to the extent of his pro rata share thereof.

            (29)  Words importing singular number shall include the plural
      number in each case and vice versa, and words importing person shall
      include corporations, and associations, as well as natural persons.






<PAGE>

                                   -12-



            (30)  The words "herein," "hereby," "herewith," "hereof,"
      "hereinafter," "hereunder," "hereinabove," "hereafter", "heretofore"
      and similar words or phrases of reference and association shall refer
      to this Indenture in its entirety.

                                ARTICLE II

                Deposit of Securities; Acceptance of Trust;
                  Issuance of Units; Form of Certificates

            Section 2.01  Deposit of Securities:  (a)  The Depositor,
concurrently with the execution and delivery of the Reference Trust
Agreement, will deposit with the Trustee in trust the Securities listed in
the Schedule or Schedules attached to such Reference Trust Agreement in
bearer form or duly endorsed in blank or accompanied by all necessary
instruments of assignment and transfer in proper form to be held,
administered and applied by the Trustee as herein provided.  The Depositor
shall deliver the Securities listed on said Schedule or Schedules to the
Trustee which were not actually delivered concurrently with the execution
and delivery of the Reference Trust Agreement within 90 days after said
execution and delivery or, if Section 3.14 applies, within such shorter
period as is specified in Section 3.14.

            (b)  From time to time and in the discretion of the Depositor,
the Depositor may make deposits of Additional Securities duly endorsed in
blank or accompanied by all necessary instruments of assignment and
transfer in proper form (or contracts to purchase Additional Securities and
cash or an irrevocable letter of credit in an amount necessary to
consummate the purchase of any Additional Securities pursuant to such
contracts ("Additional Contract Securities")) and Cash (as defined below),
if Cash is an asset of the Trust immediately prior to the supplemental
deposit, provided that each deposit of Additional Securities and Cash, if
any, deposited during the 90-day period following the first deposit of
Securities in the Trust shall replicate, to the extent practicable as
hereinafter provided, the Securities (including Contract Securities) and
shall exactly replicate Cash (other than Cash to be distributed only (i) to
the Depositor with respect to interest accrued prior to the initial date of
deposit or (ii) in respect of Units issued and outstanding prior to the
deposit) held in the Trust immediately prior to each such deposit; and,
provided further, that each deposit of Additional Securities and Cash, if
any, subsequent to such






<PAGE>

                                   -13-



90-day period shall exactly replicate the Securities (including Contract
Securities) and Cash (other than Cash to be distributed only to the
Depositor or in respect of Units issued and outstanding prior to the
deposit) held in the Trust immediately prior to each such deposit.  For
purposes of this paragraph Cash means cash on hand in the Trust and/or cash
receivable by the Trust as of the date of the supplemental deposit in
respect of a coupon date which has occurred on or before the date of such
supplemental deposit, reduced by payables and accrued expenses on such
date.

            Accordingly, for a deposit subsequent to the 90-day period
following the first deposit of Securities:

            1.    Any Additional Securities included in a deposit shall be
      identical to Securities held in the Trust immediately prior to the
      deposit and Bonds included therein shall be in face amounts such that
      (i) the face amount of Bonds of a particular issue included in a
      deposit divided by (ii) the aggregate of the face amounts of all
      Bonds included in the deposit results in a fraction which is the same
      as the fraction resulting from division of (iii) the aggregate face
      amount of the Bonds of the same issue held in the Trust divided by
      (iv) the aggregate face amount of all Bonds held in the Trust
      immediately prior to the deposit;

            2.    Any deposit of Bonds shall be accompanied by Cash in an
      amount bearing the same ratio to the aggregate face amount of all
      Bonds in the deposit as the Cash held in the Trust immediately prior
      to the deposit bears to the aggregate face amount of all Bonds held
      in the Trust immediately prior to the deposit, exclusive of Cash held
      in the Trust and designated for distribution only (i) to the
      Depositor with respect to interest accrued prior to the initial date
      of deposit or (ii) with respect only to Units issued and outstanding
      prior to the deposit; and

            3.    Any Additional Deposited Units included in a deposit
      shall be identical with Deposited Units then held in the Trust and
      shall be in numbers determined by multiplying the number of Deposited
      Units with respect to a particular prior series Dean Witter Select
      Government Trust held in the Trust immediately prior to the deposit
      by the fraction obtained by dividing the face amount of all Bonds
      included in the deposit by the face amount of






<PAGE>

                                   -14-



      all Bonds included in the Trust immediately prior to the deposit;

and for a deposit during the 90-day period following the first deposit of
Securities in the Trust, the rules stated in subparagraphs (1), (2) and (3)
of this paragraph shall apply except that any Additional Securities (in-
cluding Contract Securities) need be only substantially similar (rather
than identical to) Securities held in the Trust immediately prior to the
deposit and the proportionality requirements need be met only to the extent
practicable.  Without limiting the generality of the phrase "to the extent
practicable," if the Depositor specifies a minimum face amount of a Bond or
minimum number of Deposited Units with respect to a particular trust to be
included in a deposit and such minimum requirement cannot be met or if a
Security identical to a Security held in the Trust is not readily
obtainable, substitution of other substantially similar Securities
(including Securities of an issue originally deposited) in order to meet
the foregoing proportionality requirements shall be considered as a meeting
of such requirements "to the extent practicable."

            Each deposit of Additional Securities shall be listed in and
made in accordance with a Supplemental Indenture stating the date of such
deposit and the number of Additional Units being issued therefor.

            Section 2.02  Acceptance of Trust:  The Trustee hereby accepts
the Trust created by this Indenture for the use and benefit of the Unit
Holders in the Trust, subject to the terms and conditions of this
Indenture.

            Section 2.03  Issue of Units:  By executing the Reference Trust
Agreement, the Trustee will thereby acknowledge receipt of the deposit
relating to the Trust to which such Reference Trust Agreement relates,
referred to in Section 2.01, and simultaneously with the receipt of said
deposit, will execute Certificates substantially in the form above recited
representing the ownership of all Units of the Trust as specified in
Part II of the Reference Trust Agreement.  The Trustee hereby agrees that
on the date of any Supplemental Indenture, it shall acknowledge that the
Additional Securities identified therein have been deposited with it by
recording on its books the ownership by the Depositor, or such other person
or persons as may be indicated by the Depositor, of the aggregate number of
Units to be issued in respect of such Additional Securities so deposited,
and shall, if so requested,



<PAGE>

                                   -15-



execute Certificates substantially in the form above recited representing
the ownership of an aggregate number of those Units.

            Under the terms and conditions and at such times as are
permitted by the Trustee, Units may also be held in uncertificated form.
Unit Holders may elect to have their Units held in uncertificated form by
surrendering their Certificates to the Trustee for cancellation.  At such
time, an appropriate notation will be made in the registration books of the
Trustee to indicate that the Units formerly evidenced by such cancelled
Certificates are Units held in uncertificated form.  The Trustee shall, at
the request of the Holder of any Units held in uncertificated form, issue a
new Certificate to evidence such Units and at such time make an appropriate
notation in the registration books of the Trustee.  The rights set forth in
this Agreement of any holder of Units held in uncertificated form shall be
the same as those of any other Unit Holder.

            The Trusts created by this Indenture are separate and distinct
trusts for all purposes and the assets of one such trust may not be
commingled with the assets of any other trust, except as expressly provided
herein, nor shall the expenses of any such trust be charged against the
other.  The Certificates representing the ownership of a fractional
undivided interest in one Trust shall not be exchangeable for certificates
representing the ownership of an undivided fractional interest in any
other.

            Section 2.04  Form of Certificates:  Each Certificate referred
to in Section 2.03 shall be in substantially the form hereinabove recited,
numbered serially for identification, in fully registered form,
transferable only on the books of the Trustee as herein provided, executed
manually or in facsimile by an authorized officer of the Trustee and in
facsimile by an authorized officer of the Depositor of the Trust to which
the Certificate relates, and dated the date of execution and delivery by
the Trustee.

                                ARTICLE III

                          Administration of Trust

            Section 3.01  Initial Costs:  With respect to the Trust, the
cost of the initial preparation and printing and execution of this
Indenture, the initial fees of the Evaluator






<PAGE>

                                   -16-



and other reasonable expenses in connection therewith shall be paid by the
Depositor (the cost of the initial preparation of the Certificates shall be
paid by the Trustee); provided, however, that the liability on the part of
the Depositor for such initial costs, fees and expenses shall not include
any fees, costs or other expenses incurred in connection herewith after the
execution of this Indenture, and the deposit relating to the Trust,
referred to in Section 2.01.

            Section 3.02  Interest Account:  The Trustee shall collect the
interest on the Securities in the Trust as such becomes payable (including
all interest accrued but unpaid prior to the date of deposit of the
Securities in trust and including that part of the proceeds of the sale,
liquidation, redemption or maturity of any Securities which represents
accrued interest thereon and including all moneys paid pursuant to any
insurance contract representing interest on the Bonds in the Trust) and
credit such interest to a separate account to be known as the "Interest
Account."

            Section 3.03  Principal Account:  The Securities in the Trust
and all moneys, including all moneys paid pursuant to any insurance
contract representing principal of any Bond in the Trust, other than
amounts credited to the Interest Account for the Trust, received by the
Trustee in respect of the Securities in the Trust shall be credited to a
separate account for the Trust to be known as the "Principal Account" for
the Trust.

            Section 3.04  Reserve Account:  From time to time the Trustee
shall withdraw from the cash on deposit in the Interest Account or the
Principal Account of the Trust such amounts as it, in its sole discretion,
shall deem requisite to establish a reserve for any applicable taxes or
other governmental charges that may be payable out of the Trust.  Such
amounts so withdrawn shall be credited to a separate account for the Trust
which shall be known as the "Reserve Account."  The Trustee shall not be
required to distribute to the Unit Holders any of the amounts in the
Reserve Account; provided, however, that if it shall, in its sole
discretion, determine that such amounts are no longer necessary for payment
of any applicable taxes or other governmental charges, then it shall
promptly deposit such amounts in the appropriate account or, if such Trust
has been terminated or is in the process of termination, the Trustee shall
distribute to each Unit Holder thereof such holder's interest in the
Reserve Account of such Trust in accordance with Section 9.02.






<PAGE>

                                   -17-



            Section 3.05  Distribution:  On the First Settlement Date for
Units as set forth in the Prospectus the Trustee shall deduct from the
Interest Account and distribute to the Depositor a sum equal to those
amounts advanced by the Trustee  to the Trust, if applicable, sufficient to
cover accrued interest on the Bonds to the First Settlement Date.  On each
settlement date for Contract Securities and Replacement Bonds, the Trustee
shall also deduct from the Interest Account and distribute to the Depositor
a sum equal to those amounts advanced by the Trustee to the Trust
sufficient to cover accrued interest on such Contract Securities or
Replacement Bonds for the period from the First Settlement Date to the
actual settlement date of such Contract Securities or Replacement Bonds.
Such distributions from the Trustee to the Depositor are hereinafter
collectively referred to as the "Depositor's Special Distribution."  In the
event that Bonds are delivered to the Trust later than their expected
delivery dates, the Trustee shall adjust its fee downward as provided in
Section 6.04.  In the event that Contract Securities are issued later than
their expected dates of issue, the Trustee shall adjust its fee downward as
provided in Section 6.04.  The Trustee shall be entitled to reimbursements,
without interest, for such advancements and such reimbursements shall be
made from interest received by the Trust before any further distributions
shall be made from the Interest Account to Unit Holders.  Subsequent
distributions shall be made as hereinafter provided.

            As of each Record Date for a Trust, the Trustee shall:

            (a)  deduct from the Interest Account or, to the
      extent funds are not available in such Account, from the
      Principal Account and pay to itself individually the amounts
      that it is at the time entitled to receive pursuant to
      Section 6.04;

            (b)  deduct from the Interest Account or, to the
      extent funds are not available in such Account, from the
      Principal Account and pay to the Evaluator the amount that
      it is at the time entitled to receive pursuant to Section
      4.03;

            (c)  deduct from the Interest Account or, to the
      extent funds are not available in such Account, from the
      Principal Account and pay to counsel, designated as
      hereinafter provided, an






<PAGE>

                                   -18-



      amount equal to unpaid fees and expenses, if any, of such
      counsel as certified to by the Depositor; and

            (d)  deduct from the Interest Account or, to the
      extent funds are not available in such Account, from the
      Principal Account one-twelfth of the estimated annual amount
      that the Depositor is entitled to receive pursuant to
      Section 8.07 and hold such amount without interest until
      such time as it is payable to the Depositor as set forth
      below.  On or before the first Distribution Date after the
      conclusion of each quarter of the calendar year, the Trustee
      shall distribute to the Depositor from the amount so held
      pursuant to the immediately preceding paragraph the amounts
      that the Depositor is at the time entitled to receive
      pursuant to Section 8.07 on account of its services
      theretofore performed and expenses theretofore incurred.

            Distributions from the Interest and Principal Accounts shall be
made in accordance with the Unit Holder's election (the "Reinvestment
Election").  Such Reinvestment Election shall be made initially upon
purchase of any Units in the manner specified by the Depositor when, as and
if any such Reinvestment Election is or remains available through the
Depositor and, thereafter, such Reinvestment Election shall be made in
writing on a card furnished by the Trustee at the request of the Unit
Holder.  The card shall provide the following choices:  (1) distributions
to be made by mail addressed to the post office address of the Unit Holder
as it appears on the registration books of the Trustee and
(2) distributions to be made to the designated agent for any Reinvestment
Programs when, as and if available to the Unit Holder through the
Depositor.  If no Reinvestment Election is offered by the Depositor or if
no Reinvestment Election is specified by the Unit Holder at the time of
purchase of any Unit, distributions of principal and interest shall be made
to the Unit Holder, as provided in (1) above.  Once a Reinvestment Election
has been chosen by the Unit Holder, such election shall remain in effect
until changed by the Unit Holder.  Such change of election may be made by
notification thereof to the Trustee at any time in form satisfactory to the
Trustee, or by returning the above mentioned election card and noting such
change of election thereon.  A transferee of any Unit shall receive an
election card and may make his Reinvestment Election




<PAGE>

                                   -19-



as set forth above.  The Trustee shall be entitled to receive in writing a
notification from the Unit Holder as to his or her change of address.

            With respect to all Series of the Dean Witter Select Government
Trust, on or shortly after the first Distribution Date, the Trustee shall
distribute, according to the Unit Holder's Reinvestment Election, to all
Unit Holders of record on the preceding Record Date, an amount from the
Interest Account specified in the Reference Trust Agreement for the Trust,
which amount may be a partial distribution, equal to a fraction of the
amount of each monthly distribution as provided for in the Reference Trust
Agreement, together with each Unit Holder's fractional share of the balance
of the Principal Account, computed as of close of business on such Record
Date.

            On each subsequent Distribution Date or within a reasonable
period of time thereafter, the Trustee shall distribute by mail to each
Unit Holder of record at the close of business on the immediately preceding
Record Date at his post office address such holder's pro rata share of the
balance of the Interest Account (on the basis of one-twelfth of the amount
of net annual interest per unit expected to be received by the Trust during
the ensuing twelve months less deductions of estimated expenses for such
period), computed as of such preceding Record Date for the Trust, plus such
holder's pro rata share of the cash balance of the Principal Account of the
Trust, computed as of such preceding Record Date for the Trust, except as
reduced by any amounts deducted pursuant to Paragraphs (a), (b) and (c) of
this Section 3.05.

            The Trustee shall not be required to make a distribution from
the Principal Account for any Series unless the cash balance on deposit
therein available for distribution shall be sufficient to distribute at
least $0.001 per $1 Unit; provided, however, that notwithstanding the
foregoing, when so directed by the Depositor, the Trustee shall hold
specially for anticipated redemptions such amount as the Depositor shall
direct, until that sum is exhausted by disbursements in payment of
redemptions or until the Depositor shall notify the Trustee that such
amount is no longer required for this purpose, at which time such amount
shall cease to be segregated within the Principal Account.

            In the event the amount on deposit in the Interest Account of
the Trust on a Distribution Date therefor is not sufficient for the payment
of the amount of interest to be






<PAGE>

                                   -20-



distributed on the basis of the aforesaid computation, the Trustee shall
advance out of its own funds and cause to be deposited in and credited to
such Interest Account such amount as may be required to permit payment of
the interest distribution to be made on such Distribution Date; provided,
however, that the Trustee shall be entitled to be reimbursed without
interest out of the Trust for any and all amounts advanced by it pursuant
to this Section 3.05.  The Trustee shall pay to itself the amounts which it
is entitled to receive as reimbursement for amounts advanced pursuant to
the preceding sentence, by deducting, subject to the limitations set forth
below, such amounts from the Interest Account when funds are available from
interest payments on the particular Bonds on which accrued interest was
paid.  The Trustee shall be deemed to be the beneficial owner of the
interest payments or coupons in question to the extent of all amounts
advanced by it pursuant to this Section 3.05, and such advances shall be
considered a lien on the Trust and the Trustee shall have priority over
Unit Holders on funds received as payments upon the Bonds, as such payments
are received by the Trustee.

            Nothing in this Section shall be construed so as to permit the
Trustee to reimburse itself for advances, if such reimbursement would
result in a failure by the Trustee to make a required distribution from the
Interest Account except where advances were made by the Trustee on Bonds
which have defaulted and the interest on which is now uncollectible, in
which case the Trustee may reimburse itself for such advances and reduce,
if necessary, the amount of a distribution from the Interest Account.

            If the Depositor fails to replace any failed Special Bond in
accordance with Section 3.14, the Trustee shall distribute to all Unit
Holders the principal attributable to such Special Bond not later than the
second Distribution Date and, to the extent funds are provided by the
Depositor, will at such time distribute on behalf of the Depositor the
sales charge attributable to such Special Bond.

            If less than all moneys attributable to a failed Special Bond
have been applied by the Trustee to purchase Replacement Bonds, the Trustee
shall distribute the remaining moneys to all Unit Holders not later than
the second Distribution Date following the deposit in which the failed
Special Bond was included.





<PAGE>

                                   -21-



            The amount to be so distributed to each Unit Holder of the
Trust shall be that pro rata share of the cash balance of the Interest and
Principal Accounts of the Trust, computed as set forth above, as shall be
represented by the Units registered in the name of such Unit Holder.

            In the computation of each such share, fractions of less than
one cent shall be omitted.  After any such distribution provided for above,
any cash balance remaining in the Interest Account or the Principal Account
of the Trust shall be held in the same manner as other amounts subsequently
deposited in each of such Accounts, respectively.

            For the purpose of distribution as herein provided, the holders
of record on the registration books of the Trustee at the close of business
on each Record Date shall be conclusively entitled to such distribution,
and no liability shall attach to the Trustee by reason of payment to any
such registered Unit Holder of record.  Nothing herein shall be construed
to prevent the payment of amounts from the Interest Account and the
Principal Account of the Trust to individual Unit Holders by means of one
check, draft or other proper instrument, provided that the appropriate
statement of such distribution shall be furnished therewith as provided in
Section 3.06 hereof.

            Section 3.06  Distribution Statements:  With each distribution
from the Interest or Principal Accounts of the Trust the Trustee shall set
forth, either in the instrument by means of which payment of such
distribution is made or in an accompanying statement, the amount being
distributed from each such account expressed as a dollar amount per Unit.

            In the event that the issuer of any of the Bonds in the Trust
shall fail to make payment when due of any interest or principal and such
failure results in a change in the amount which would otherwise be
distributed as a periodic distribution, the Trustee shall, with the first
such distribution relating to such Trust following such failure, set forth
in an accompanying statement (a) the name of the issuer and the Bond, (b)
the amount of the reduction in the distributions per Unit resulting from
such failure, (c) the percentage of the aggregate principal amount of
Securities which such Bond represents and (d) to the extent then
determined, information regarding any disposition or legal action with
respect to such Bond.




<PAGE>

                                   -22-



            In the event that a preceding series of Dean Witter Select
Government Trust to which any of the Deposited Units relate fails to make a
distribution when due of any interest or principal and such failure results
in a change in the amount which would otherwise be distributed hereunder as
a monthly distribution, the Trustee shall, with the first such distribution
following such failure, set forth in an accompanying statement (a) the name
of the preceding series and the Deposited Units, (b) the amount of the
reduction in the distributions per unit resulting from such failure, (c)
the percentage of the aggregate face amount of Securities which such
Deposited Units represent and (d) to the extent then determined,
information regarding any disposition or legal action with respect to such
preceding series or such Deposited Units.

            Within a reasonable period of time after the last business day
of each calendar year, but not later than February 15, the Trustee shall
furnish to each person who at any time during such calendar year was a Unit
Holder of the Trust a statement setting forth, with respect to such
calendar year:

      (A)   as to the Interest Account of the Trust:

            1.    the amount of interest received on the
                  Securities,

            2.    the amounts paid (a) for purchases of
                  Replacement Bonds pursuant to Section 3.14 and
                  (b) for redemption pursuant to Section 5.02,

            3.    the deductions for payment of applicable taxes,
                  compensation of the Evaluator, the Depositor's
                  portfolio supervisory fee and fees and expenses
                  of the Trustee and bond counsel, and

            4.    the balance remaining after such distributions
                  and deductions, expressed both as a total dollar
                  amount and as a dollar amount per 1,000 Units
                  outstanding on the last business day of such
                  calendar year;





<PAGE>

                                   -23-



      (B)   as to the Principal Account of the Trust:

            1.    the dates of the sale, maturity, liquidation or
                  redemption of any of the Securities and the net
                  proceeds received therefrom, excluding any
                  portion thereof credited to the Interest
                  Account,

            2.    the amount paid (a) for purchases of Replacement
                  Bonds pursuant to Section 3.14, and (b) for
                  redemptions pursuant to Section 5.02,

            3.    the deductions for payment of applicable taxes,
                  compensation of the Evaluator, the Depositor's
                  portfolio supervisory fee and fees and expenses
                  of the Trustee and bond counsel, and

            4.    the balance remaining after such distributions
                  and deductions, expressed both as a total dollar
                  amount and as a dollar amount per 1,000 Units
                  outstanding on the last business day of such
                  calendar year; and

      (C)   the following information:

            1.    a list of the Securities held in the Trust as of
                  the last business day of such calendar year,

            2.    the number of Units of such Trust outstanding on
                  the last business day of the calendar year,

            3.    the Unit Value (as defined in Section 5.01)
                  based on the last evaluation of such Trust made
                  during such calendar year, and

            4.    the amounts actually distributed during such
                  calendar year from the Interest and Principal
                  Accounts of the Trust, separately stated,
                  expressed both as total dollar amounts and as
                  dollar



<PAGE>

                                   -24-



                  amounts per Unit outstanding on the record dates
                  for such distributions.

            Section 3.07  Sale of Bonds:  In order to maintain the sound
investment character of the Trust, the Depositor thereof may direct the
Trustee to sell Bonds in the Trust at such price and time and in such
manner as shall be determined by the Depositor, provided that the Depositor
has determined that any one or more of the following conditions exist:

            (a)  that there has been a default on such Bonds in
      the payment of principal or interest, or both, when due and
      payable;

            (b)  that any action or proceeding has been instituted
      in law or equity seeking to restrain or enjoin the payment
      of principal or interest on any such Bonds, attacking the
      constitutionality of any enabling legislation or alleging
      and seeking to have judicially determined the illegality of
      the issuing body or the constitution of its governing body
      or officers, the illegality, irregularity or omission of any
      necessary acts or proceedings preliminary to the issuance of
      such Bonds, or seeking to restrain or enjoin the performance
      by the officers or employees of any such issuing body of any
      improper or illegal act in connection with the
      administration of funds necessary for debt service on such
      Bonds or otherwise; or that there exists any other legal
      question or impediment affecting such Bonds or the payment
      of debt service on the same;

            (c)  that there has occurred any breach of covenant or
      warranty in any resolution, ordinance, trust, indenture or
      other document, which would adversely affect either
      immediately or contingently the payment of debt service on
      such Bonds, or other general credit standing, or otherwise
      impair the sound investment character of such Bonds;

            (d)  that there has been a default in the payment of
      principal of or interest on any other outstanding Securities
      of an issuer of such Bonds;




<PAGE>

                                   -25-



            (e)  that the price of any such Bonds has declined to
      such an extent, or such other market or credit factor
      exists, that in the opinion of the Depositor the retention
      of such Bonds would be detrimental to the Trust and to the
      interest of the Unit Holders thereof;

            (f)  that such Bonds are the subject of an advanced
      refunding.  For the purposes of this Section 3.07(f), "an
      advanced refunding" shall be deemed to have occurred when
      refunding Bonds are issued and the proceeds thereof are
      deposited in irrevocable trust to retire the Bonds on or
      before their redemption date;

            (g)  that as of any Record Date such Bonds are
      scheduled to be redeemed and paid prior to the next
      succeeding Distribution Date; provided, however, that as the
      result of such sale the Trustee will receive funds in an
      amount equal to or greater than $.0005 per Unit.

            Upon receipt of such direction from the Depositor, upon which
the Trustee shall rely, the Trustee shall proceed to sell the specified
Bonds in accordance with such direction; provided, however, that the
Trustee shall not sell any Bonds upon receipt of a direction from the
Depositor specifying that it has determined that the conditions in
subdivision (g) above exist, unless the Trustee shall receive on account of
such sale the full principal amount of such Bonds, plus the premium, if
any, and the interest accrued and to accrue thereon to the date of the
redemption of such Bonds.  The Trustee shall not be liable or responsible
in any way for depreciation or loss incurred by reason of any sale made
pursuant to any such direction or by reason of the failure of the Depositor
to give any such direction, and in the absence of such direction the
Trustee shall have no duty to sell any Bonds under this Section 3.07 except
to the extent otherwise required by Section 3.10 of this Indenture.

            Section 3.08  Refunding Bonds:  In the event that an offer
shall be made by an obligor of any of the Bonds in the Trust to issue new
obligations and/or other property in exchange and substitution for any
issue of Bonds pursuant to a plan for the refunding or refinancing of such
Bonds or the restructuring of the Bond issuer, the Depositor of the Trust
shall instruct the Trustee in writing to reject such offer and



<PAGE>

                                   -26-



either to hold or sell such Bonds, except that if (1) the issuer is in
default with respect to such Bonds or (2) in the opinion of the Depositor,
given in writing to the Trustee, the issuer will probably default with
respect to such Bonds in the reasonably foreseeable future, the other
property so offered in exchange and substitution would not involve the
Trust in the conduct of a trade or business, the Depositor shall instruct
the Trustee in writing to accept or reject such offer or take any other
action with respect thereto as the Depositor may deem proper.  Any cash so
received shall be credited to the Principal Account and distributed to
holders of Units on the record date next following or coinciding with the
date of receipt of such cash.  Any obligation so received in exchange shall
be deposited hereunder and shall be subject to the terms and conditions of
this Indenture to the same extent as the Bonds originally deposited
hereunder.

            Any property received in such exchange other than an obligation
shall be sold for cash by the Trust as soon as practicable and the proceeds
credited to the Principal Account and distributed to the holders of Units
on the record date next following or coinciding with the date of receipt of
such cash.

            Within five days after such deposit, notice of such exchange
and deposit shall be given by the Trustee to each Unit Holder or
Certificateholder, as the case may be, including an identification of the
Bonds eliminated and the Bonds and/or other security substituted therefor.

            Section 3.09  Bond Counsel:  The Depositor may employ from time
to time as it may deem necessary or desirable a firm of attorneys for any
legal services that may be required in connection with the disposition of
Bonds pursuant to Section 3.07 or for any other reasons deemed advisable by
the Depositor or the Trustee, in their discretion.  The fees and expenses
of such counsel may, at the discretion of the Depositor, be paid by the
Trustee from the Interest and Principal Accounts of the Trust as provided
for in Section 3.05(c) hereof.

            Section 3.10  Notice and Sale by Trustee:  If at any time the
principal of or interest on any of the Bonds in a Trust shall be in default
and not paid or provision for payment thereof shall not have been duly
made, the Trustee shall notify the Depositor thereof.  If within thirty
days after such notification the Depositor has not given any instruction to
sell or to hold or has not taken any other action in connection with such
Bonds, the Trustee shall sell such Bonds forthwith,





<PAGE>

                                   -27-



and the Trustee shall not be liable or responsible in any way for
depreciation or loss incurred by reason of such sale.

            Section 3.11  Trustee Not To Amortize:  Nothing in this
Indenture, or otherwise, shall be construed to require the Trustee to make
any adjustments between the Interest and Principal Accounts of the Trust by
reason of any premium or discount in respect of any of the Bonds.

            Section 3.12  Notice to Depositor:  In the event that the
Trustee shall have been notified at any time of any action to be taken or
proposed to be taken by holders of the Securities in a Trust (including but
not limited to the making of any demand, direction, request, giving of any
notice, consent or waiver or the voting with respect to any amendment or
supplement to any indenture, resolution, agreement or other instrument
under or pursuant to which the Securities have been issued) the Trustee
shall promptly notify the Depositor and shall thereupon take such action or
refrain from taking any action (not inconsistent with its duties as
Trustee) as the Depositor shall in writing direct; provided, however, that
if the Depositor shall not within five business days of the giving of such
notice to the Depositor direct the Trustee to take or refrain from taking
any action, the Trustee shall take such action as it, in its sole
discretion, shall deem advisable.  Neither the Depositor nor the Trustee
shall be liable to any person for any action or failure to take action with
respect to this Section 3.12.

            Section 3.13  Sale of Deposited Units:  In order to maintain
the sound investment character of the Trust, the Depositor of such Trust
may direct the Trustee to sell or redeem Deposited Units at such price (in
the case of a sale) and time and in such manner as shall be determined by
the Depositor, provided that the Depositor has determined that the price of
any such Deposited Units has declined to such an extent, or such other
market or credit factor exists, that in the opinion of the Depositor the
retention of such Deposited Units would be detrimental to the Trust and to
the interest of the Unit Holders.

            Upon receipt of such direction from the Depositor, upon which
the Trustee shall rely, the Trustee shall proceed to sell or redeem the
specified Deposited Units in accordance with such direction.  The Trustee
shall not be liable or responsible in any way for depreciation or loss
incurred by reason of any sale or redemption made pursuant to any such
direction or by






<PAGE>

                                   -28-



reason of the failure of the Depositor to give any such direction, and in
the absence of such direction the Trustee shall have no duty to sell any
Deposited Units under this Section 3.13.

            Section 3.14  Replacement Bond:  In the event that the purchase
of any Contract Security is not consummated in accordance with the contract
for its purchase due to any occurrence, act or event beyond the control of
the Depositor and of the Trustee (such a Contract Security being herein
called a "Special Bond"), the Depositor may instruct the Trustee to
purchase a Replacement Bond or Bonds which have been selected by the
Depositor having a cost and an aggregate principal amount not in excess of
the cost and aggregate principal amount of the Special Bonds not so
delivered.  To be eligible for inclusion in the Trust, the Replacement
Bonds which the Depositor selects must:  (i) have a fixed maturity  or
disposition date consistent with the term of the Trust; (ii) be purchased
at a price that results in a yield to maturity and in a current return, in
each case as of the execution and delivery of the applicable Reference
Trust Agreement, which is approximately equivalent to the yield to maturity
and current return of the Special Bonds which failed to be delivered and
for which the Replacement Bonds are substituted; (iii) be purchased within
twenty days after delivery of notice of the failed contract to the Trustee
or to the Depositor, whichever occurs first; and (iv) be consistent with
the objectives of the Trust.

            Any Replacement Bonds received by the Trustee shall be
deposited hereunder and shall be subject to the terms and conditions of
this Indenture to the same extent as other Bonds deposited hereunder.  No
such deposit of Replacement Bonds shall be made after the earlier of (i) 90
days after the date of execution and delivery of the applicable Reference
Trust Agreement or (ii) the first Distribution Date.  On the settlement
date for each Replacement Bond, the Trustee shall deduct from the Interest
Account and distribute to the Depositor a sum sufficient to cover accrued
interest on such Replacement Bond for the period from the purchase date of
such Replacement Bond to the settlement date for such bonds, less an amount
equal to accrued interest, if any, which was charged to the Unit Holders
for the Special Bond that is being replaced.

            Whenever a Replacement Bond is acquired by the Depositor
pursuant to the provisions of this Section 3.14, the Trustee shall, within
five days thereafter, mail to all Unit



<PAGE>

                                   -29-



Holders notices of such acquisition, including an identification of the
failed Special Bond and the Replacement Bond acquired.  The purchase price
of a Replacement Bond shall be paid out of the principal attributable to
the failed Special Bond which it replaces.  The Trustee shall not be liable
or responsible in any way for depreciation or loss incurred by reason of
any purchase made pursuant to any such instructions and in the absence of
such instructions the Trustee shall have no duty to purchase any
Replacement Bonds under this Indenture.  The Depositor shall not be liable
for any failure to instruct the Trustee to purchase any Replacement Bond or
for errors of judgment in selecting any Replacement Bond.

                                ARTICLE IV

                    Evaluation of Securities; Evaluator

            Section 4.01  Evaluation by Evaluator:  The Evaluator shall
determine separately and promptly furnish to the Trustee and the Depositor
upon request the value of each issue of Securities in the Trust (treating
(a) separate maturities of Securities and (b) Deposited Units in separate
preceding series of Dean Witter Select Government Trust as separate issues)
as of the Evaluation Time on the bid side of the market on the days on
which the Trustee shall make the Trust Evaluation required by Section 5.01
and, in addition, (i) as of the Evaluation Time on the offering side of the
market each business day during the initial public offering period, (ii) if
and as long as requested by the Depositor on the offering side of the
market on each business day following such initial public offering period,
(iii) on the offering side of the market on the last business day of each
calendar week commencing with the week in which the Evaluator and the
Trustee have been informed by the Depositor that the initial public
offering of the Units for such Trust has been completed and (iv) on any
other day requested by the Depositor or the Trustee.  In making the
evaluations the Evaluator may determine the value of each issue of the
Securities in the Trust by the following methods or any combination thereof
which it deems appropriate:  (i) on the basis of current bid or offering
prices of such Securities as obtained from investment dealers or brokers
(including the Depositor) who customarily deal in securities comparable to
those held by the Trust (in the case of Deposited Units, such current bid
or offering prices may be based on prevailing daily evaluations of the
underlying obligations held in those preceding series of Dean Witter Select
Government Trust to which Deposited Units relate), or



<PAGE>

                                   -30-



(ii) if bid or offering prices are not available for any of such
Securities, on the basis of bid or offering prices for comparable
Securities, or (iii) by appraisal.  The Evaluator shall also make an
evaluation of the Securities deposited in the Trust as of the times said
Securities are deposited under this Indenture.  Such evaluation shall be
made on the same basis as set forth above and shall be based upon offering
prices of said Securities.  The Evaluator's determination of the offering
price of the Securities of the Trust on the date of deposit shall be
included in the Schedules attached to the Reference Trust Agreement.

            Section 4.02  Tax Reports:  For the purpose of aiding Unit
Holders to satisfy any reporting requirements of applicable Federal or
state tax law, the Evaluator shall make available to the Trustee and the
Trustee shall transmit to any Unit Holder upon request any determinations
made by the Evaluator pursuant to Section 4.01.

            Section 4.03  Evaluator's Compensation:  As compensation for
its services hereunder, the Evaluator, with respect to each series, shall
receive against a statement therefor submitted to the Trustee monthly on or
before each Record Date the amount as set forth in the Reference Trust
Agreement for each evaluation of the series, provided, however, that if at
any time the fee of the Trustee shall have been increased pursuant to
Section 6.04, the compensation of the Evaluator hereunder shall at the same
time be ratably increased.

            Section 4.04  Liability of Evaluator:  The Trustee, Depositor
and Unit Holders may rely on any evaluation furnished by the Evaluator and
shall have no responsibility for the accuracy thereof.  The determinations
made by the Evaluator hereunder shall be made in good faith upon the basis
of the best information available to it.  The Evaluator shall be under no
liability to the Trustee, Depositor or Unit Holders for errors in judgment;
provided, however, that this provision shall not protect the Evaluator
against any liability to which it would otherwise be subject by reason of
willful misfeasance, bad faith or gross negligence in the performance of
its duties or by reason of its reckless disregard of its obligations and
duties hereunder.

            Section 4.05  Successor Evaluator:  (a)  The Evaluator may
resign and be discharged hereunder, by executing an instrument in writing
resigning as Evaluator and filing the



<PAGE>

                                   -31-



same with the Depositor and the Trustee, not less than 60 days before the
date specified in such instrument when, subject to Section 4.05(e), such
resignation is to take effect.  Upon receiving such notice of resignation,
the Depositor and the Trustee shall use their best efforts to appoint a
successor evaluator having qualifications and at a rate of compensation
satisfactory to the Depositor and the Trustee.  Such appointment shall be
made by written instrument executed by the Depositor and the Trustee, in
duplicate, one copy of which shall be delivered to the resigning Evaluator
and one copy to the successor evaluator.  The Depositor may remove the
Evaluator at any time upon 30 days' written notice and appoint a successor
evaluator having qualifications reasonably satisfactory to the Trustee and
at a rate of compensation satisfactory to the Depositor.  Such appointment
shall be made by written instrument executed by the Depositor, in
duplicate, one copy of which shall be delivered to the Evaluator so removed
and one copy to the successor evaluator.  Notice of such resignation or
removal and appointment of a successor evaluator shall be mailed by the
Trustee to each Unit Holder.

            (b)  Any successor evaluator appointed hereunder shall execute,
acknowledge and deliver to the Depositor and the Trustee an instrument
accepting such appointment hereunder, and such successor evaluator without
any further act, deed or conveyance shall become vested with all the
rights, powers, duties and obligations of its predecessor hereunder with
like effect as if originally named Evaluator herein and shall be bound by
all the terms and conditions of this Agreement.

            (c)  In case at any time the Evaluator shall resign and no
successor evaluator shall have been appointed and have accepted appointment
within 30 days after notice of resignation has been received by the
Depositor and the Trustee, the Evaluator may forthwith apply to a court of
competent jurisdiction for the appointment of a successor evaluator.  Such
court may thereupon, after such notice, if any, as it may deem proper and
prescribe, appoint a successor evaluator.

            (d)  Any corporation into which the Evaluator hereunder may be
merged or with which it may be consolidated, or any corporation resulting
from any merger or consolidation to which the Evaluator hereunder shall be
a party, shall be the successor evaluator under this Agreement without the
execution or filing of any paper, instrument or further act to be done on
the part of the parties hereto, anything herein, or in any agreement
relating to such merger or consolidation, by which






<PAGE>

                                   -32-



the Evaluator may seek to retain certain powers, rights and privileges
theretofore obtaining for any period of time following such merger or
consolidation, to the contrary notwithstanding.

            (e)  Any resignation or removal of the Evaluator and
appointment of a successor evaluator pursuant to this Section shall become
effective upon acceptance of appointment by the successor evaluator as
provided in subsection (b) hereof.

                                 ARTICLE V

             Trust Evaluation; Redemption, Purchase, Transfer,
                Interchange or Replacement of Certificates

            Section 5.01  Trust Evaluation:  The Trustee shall make an
evaluation of the Trust as of the close of trading on the New York Stock
Exchange, (i) on the last business day of each of the months of June and
December, (ii) on the day on which any Unit of the Trust is tendered for
redemption, and (iii) on any other day desired by the Trustee or requested
by the Depositor.  Such evaluations shall take into account and itemize
separately (1) the cash on hand in the Principal and Interest Accounts of
the Trust or moneys in the process of being collected from matured interest
coupons or bonds matured or called for redemption prior to maturity, (2)
the value of each issue of the Securities in the Trust on the bid side of
the market as determined by the Evaluator pursuant to Section 4.01, and (3)
interest accrued thereon not subject to collection and distribution.  For
each such evaluation there shall be deducted from the sum of the above (i)
amounts representing any applicable taxes or governmental charges payable
out of the Trust and for which no deductions shall have previously been
made for the purpose of addition to the Reserve Account, (ii) amounts
representing accrued expenses of the Trust and other amounts payable by the
Trust including but not limited to unpaid fees and expenses of the Trustee,
the Depositor, the Evaluator and bond counsel, in each case as reported by
the Trustee to the Evaluator on or prior to the date of evaluation, and
(iii) cash held for distribution to Unit Holders of record as of a date
prior to the evaluation then being made.  The value of the pro rata share
of each Unit of the Trust determined on the basis of any such evaluation
shall be referred to herein as the "Unit Value."  From time to time, the
Depositor may prescribe when appropriate, and the Trustee shall follow,
procedures relating to the estimation of the principal amount of Securities
and accrual of interest






<PAGE>

                                   -33-



thereon during such periods when the principal amount of the Securities is
not publicly available.  Such procedures, if prescribed, may be modified or
rescinded by  the Depositor at any time.

            Section 5.02  Redemptions by Trustee; Purchases by Depositor:
Any Unit tendered for redemption by a Unit Holder or his duly authorized
attorney to the Trustee at its unit investment trust office in the City of
New York, shall be redeemed by the Trustee on the seventh calendar day
following the day on which tender for redemption is made, provided that if
such day of redemption is not a business day, then such Unit shall be
redeemed on the first business day prior thereto (being herein called the
"Redemption Date"). Subject to payment by such Unit Holder of any tax or
other governmental charges which may be imposed thereon, redemption of such
Unit is to be made by payment on the Redemption Date of cash equivalent to
the Unit Value, determined by the Trustee as of the close of trading on the
New York Stock Exchange, on the date of tender plus a sum equivalent to the
amount of accrued interest which would have been payable with respect to
such Unit to, but not including, the fifth business day following the date
of tender (herein called the "Redemption Price").  If so directed by the
Depositor, Units may be redeemed by the distribution of Securities in-kind.
Units received for redemption by the Trustee on any day after the
Evaluation Time will be held by the Trustee until the next day on which the
New York Stock Exchange is open for trading and will be deemed to have been
tendered on such day for redemption at the Redemption Price computed on
that day.

            The Trustee may in its discretion, and shall when so directed
by the Depositor, suspend the right of redemption for Units of the Trust or
postpone the date of payment of the Redemption Price therefor for more than
seven calendar days following the day on which tender for redemption is
made (1) for any period during which the New York Stock Exchange is closed
other than customary weekend and holiday closings or during which trading
on the New York Stock Exchange is restricted; (2) for any period during
which an emergency exists, as a result of which disposal by the Trust of
the Securities is not reasonably practicable or it is not reasonably
practicable to determine fairly in accordance herewith the value of the
Securities; or (3) for such other period as the Securities and Exchange
Commission may by order permit, and shall not be liable to any person or in
any way for




<PAGE>

                                   -34-



any loss or damage which may result from any such suspension or
postponement.

            Not later than the close of business on the day of tender of a
Unit for redemption by a Unit Holder other than the Depositor, the Trustee
shall notify the Depositor of such tender.  Such Depositor shall have the
right to purchase such Unit by notifying the Trustee of its election to
make such purchase as soon as practicable thereafter but in no event
subsequent to the close of business on the next business day after the day
on which such Unit was tendered for redemption.  Such purchase shall be
made by payment for such Unit by the Depositor to the Unit Holder not later
than the close of business on the Redemption Date of an amount not less
than the Redemption Price which would otherwise be payable by the Trustee
to such Unit Holder.

            Any Unit so purchased by the Depositor may at the option of the
Depositor be tendered to the Trustee for redemption at the unit investment
trust office of the Trustee in the manner provided in the first paragraph
of this Section 5.02.

            If the Depositor does not elect to purchase any Unit of the
Trust tendered to the Trustee for redemption, or if a Unit is being
tendered by the Depositor for redemption, that portion of the Redemption
Price which represents interest shall be withdrawn from the Interest
Account of the Trust to the extent available.  No amount in the Principal
Account may be used for any redemption unless the Depositor directs
otherwise.  Instead, Units shall be redeemed by the Trustee segregating on
the books of the Trust Securities selected from among those designated on
the current list maintained for such purpose by the Depositor as provided
below, for the account of the Unit Holder but only to the extent the value
thereof is equal to the Redemption Price (less any cash distributed from
the Interest Account or from the Principal Account as directed by the
Depositor).  The Trustee shall sell the Securities any portion of which has
been segregated, or collect the redemption proceeds thereof, and distribute
such sale or redemption proceeds to the Unit Holder to the extent described
in the immediately preceding sentence, with any balance of the sale or
redemption proceeds deposited into the Principal Account.  In the case of
any Trust for which the Prospectus provides that additional Securities may
be deposited for an indefinite period of time subsequent to the initial
Date of Deposit, the Securities to be segregated shall be selected by the
Depositor






<PAGE>

                                   -35-



so as to maintain the proportionate relationships among the Securities
applicable to such subsequent deposits as described in the Prospectus.  In
the event that funds are withdrawn from the Principal Account for payment
of accrued interest, the Principal Account shall be reimbursed for such
funds so withdrawn when sufficient funds are next available in the Interest
Account.

            The Depositor shall maintain with the Trustee a current list of
Securities held in the Trust designated to be sold for the purpose of
redemption of Units of the Trust, and for payment of expenses hereunder,
provided that if the Depositor shall for any reason fail to maintain such a
list, the Trustee, in its sole discretion, may designate a current list of
Securities for such purposes. The net proceeds of any sales of Securities
from such list representing principal shall be credited to the Principal
Account of the Trust and the proceeds of such sales representing accrued
interest shall be credited to the Interest Account of the Trust.

            Sales of Securities by the Trustee shall be made in such manner
as the Trustee shall determine will bring the best price obtainable for the
Trust; provided, however, that sales shall be made in such manner, as the
Trustee shall determine, as will provide the Trustee with funds in an
amount sufficient and at the time necessary in order for it to pay the
Redemption Price of Units tendered for redemption, regardless of whether or
not a better price could be obtained if the Securities were sold without
regard for the day on which the proceeds of such sale would be received.
The Trustee shall not be liable or responsible in any way for depreciation
or loss incurred by reason of any sale or redemptions of Securities made
pursuant to this Section 5.02.

            Certificates evidencing Units redeemed pursuant to this
Section 5.02 shall be cancelled by the Trustee, and any Unit or Units
redeemed pursuant to this Section 5.02 shall be terminated by such
redemption.

            Section 5.03  Transfer or Interchange of Certificates:  A
Certificate (and the Units it represents) may be transferred by the
registered holder thereof by presentation and surrender of such Certificate
at the corporate trust office of the Trustee properly endorsed or
accompanied by a written instrument or instruments of transfer in form
satisfactory to the Trustee and executed by the Unit Holder or his
authorized attorney, whereupon a new registered Certificate or






<PAGE>

                                   -36-



Certificates for the same number of Units of the Trust executed by the
Trustee and the Depositor will be issued in exchange and substitution
therefor.  Certificates issued pursuant to this Indenture are
interchangeable for one or more other Certificates in an equal aggregate
number of Units of the Trust and all Certificates issued shall be issued in
denominations of one Unit or any multiple thereof as may be requested by
the Unit Holder.

            The Trustee may deem and treat the person in whose name any
Certificate shall be registered upon the books of the Trustee as the owner
of such Certificate for all purposes hereunder, and the Trustee shall not
be affected by any notice to the contrary, nor be liable to any person or
in any way for so deeming and treating the person in whose name any
Certificate shall be so registered.

            A sum sufficient to pay any tax or other governmental charge
that may be imposed in connection with any such transfer or interchange
shall be paid by the Unit Holder to the Trustee.  The Trustee may require a
Unit Holder to pay $2.00 for each new Certificate issued on any such
transfer or interchange.

            All Certificates cancelled pursuant to this Indenture shall be
disposed of by the Trustee without liability on its part.

            Section 5.04  Certificates Mutilated, Destroyed, Stolen or
Lost:  In case any Certificate shall become mutilated or be destroyed,
stolen or lost, the Trustee shall execute and deliver a new Certificate in
exchange and substitution therefor upon the holder's furnishing the Trustee
with proper identification and indemnity satisfactory to the Trustee,
complying with such other reasonable regulations and conditions as the
Trustee may prescribe and paying such expenses as the Trustee may incur.
Any mutilated Certificate shall be duly surrendered and cancelled before
any new Certificate shall be issued in exchange and substitution therefor.
Upon the issuance of any new Certificate a sum sufficient to pay any tax or
other governmental charge will be imposed and payment of the fees and
expenses of the Trustee may be required.  Any such new Certificate issued
pursuant to this Section shall constitute complete and indefeasible
evidence of ownership in the Trust, as if originally issued, whether or not
the lost, stolen or destroyed Certificate shall be found at any time.




<PAGE>

                                   -37-



            In the event the Trust has terminated or is in the process of
termination, the Trustee may, instead of issuing a new Certificate in
exchange and substitution for any Certificate which shall have become
mutilated or shall have been destroyed, stolen or lost, make the
distributions in respect of such mutilated, destroyed, stolen or lost
Certificate (without surrender thereof except in the case of a mutilated
Certificate) as provided in Section 9.02 hereof if the Trustee is furnished
with such security or indemnity as it may require to save it harmless, and
in the case of destruction, loss or theft of a Certificate, evidence to the
satisfaction of the Trustee of the destruction, loss or theft of such
Certificate and of the ownership thereof.

                                ARTICLE VI

                                  Trustee

            Section 6.01  General Definition of Trustee's Liabilities,
Rights and Duties:  In addition to and notwithstanding the other duties,
rights, privileges and liabilities of the Trustee as elsewhere set forth
herein, the liabilities of the Trustee are further defined as follows:

            (a)  all moneys deposited with or received by the
      Trustee hereunder shall be held by it without interest in
      trust as part of the Trust or the Reserve Account until
      required to be disbursed in accordance with the provisions
      of this Indenture and such moneys will be segregated by
      separate recordation on the trust ledger of the Trustee so
      long as such practice preserves a valid preference under
      applicable law, or if such preference is not so preserved
      the Trustee shall handle such moneys in such other manner as
      shall constitute the segregation and holding thereof in
      trust within the meaning of the Investment Company Act of
      1940;

            (b)  the Trustee shall be under no liability for any
      action taken in good faith on any appraisal, paper, order,
      list, demand, request, consent, affidavit, notice, opinion,
      direction, evaluation, endorsement, assignment, resolution,
      draft or other document whether or not of the same kind
      prima facie properly executed, or for the disposition of
      moneys, Securities, Units or Certificates pursuant to this
      Indenture, or in





<PAGE>

                                   -38-



      respect of any evaluation which it is required to make or is
      required or permitted to have made by others under this
      Indenture or otherwise, except by reason of its own willful
      misfeasance, bad faith or gross negligence in the
      performance of its duties or by reason of its reckless
      disregard of its obligations and duties hereunder; provided,
      however, that the Trustee shall not in any event be liable
      or responsible for any evaluation made by the Evaluator.
      The parties hereto may construe any of the provisions of
      this Indenture, insofar as the same may appear to be
      ambiguous or inconsistent with any other provisions hereof.
      The Trustee shall be under no liability for any construction
      of any such provisions hereof, which construction shall be
      binding upon the parties hereto;

            (c)  the Trustee shall not be responsible for or in
      respect of the recitals herein, the validity or sufficiency
      of this Indenture or for the due execution hereof by the
      Depositor or the Evaluator, or for the form, character,
      genuineness, sufficiency, value or validity of any
      Securities or for or in respect of the validity or
      sufficiency of the Certificates or of the due execution
      thereof by the Depositor and the Trustee shall in no event
      assume or incur any liability, duty or obligation to any
      Unit Holder or the Depositor other than as expressly
      provided for herein. The Trustee shall not be responsible
      for or in respect of the validity of any signatures by or on
      behalf of the Depositor or the Evaluator;

            (d)  the Trustee shall not be under any obligation to
      appear in, prosecute or defend any action, which in its
      opinion may involve it in expense or liability, unless as
      often as required by the Trustee, it shall be furnished with
      reasonable security and indemnity against such expense or
      liability, and any pecuniary cost of the Trustee from such
      actions shall be deductible from and a charge against the
      Interest and Principal Accounts of the Trust.  The Trustee
      shall in its discretion undertake such action as it may deem
      necessary at any and all times to protect the Trust and the
      rights and interests of



<PAGE>

                                   -39-



      the Unit Holders pursuant to the terms of this Indenture;
      provided, however, that the expenses and costs of such
      actions, undertakings or proceedings shall be reimbursable
      to the Trustee from the Interest and Principal Accounts, and
      the payment of such costs and expenses shall be secured by a
      lien on the Trust prior to the interests of the Unit
      Holders;

            (e)  the Trustee may employ agents, attorneys,
      accountants and auditors and shall not be answerable for the
      default or misconduct of any such agents, attorneys,
      accountants or auditors if such agents, attorneys,
      accountants or auditors shall have been selected with
      reasonable care; provided, however, that if the Trustee
      chooses to employ the Depository Trust Company in connection
      with the storage and handling of, and the furnishing of
      administrative services in connection with the Securities,
      the Trustee will be answerable for any default or misconduct
      of the Depository Trust Company and its employees and agents
      as fully and to the same extent as if such default or
      misconduct had been committed or occasioned by the Trustee.
      The Trustee shall be fully protected in respect of any
      action under this Agreement taken, or suffered, in good
      faith by the Trustee, in accordance with the opinion of its
      counsel.  The accounts of the Trusts shall be audited not
      less frequently than annually by independent certified
      public accountants designated from time to time by the
      Depositor, and the reports of such accountants shall be
      furnished by the Trustee to Unit Holders upon request.  The
      fees and expenses charged by such agents, attorneys,
      accountants or auditors shall constitute an expense of the
      Trustee reimbursable from the Interest and Principal
      Accounts of the Trust as set forth in Section 6.04 hereof;

            (f)  if the Depositor should fail to undertake or
      perform any of the duties which by the terms of this
      Indenture are required by it to be undertaken or performed
      or should the Depositor resign as Depositor or the Depositor
      should become incapable of acting or should an order of
      relief have been entered with respect to the Depositor,



<PAGE>

                                   -40-



      or a receiver of the Depositor or of its property should be
      appointed, or any public officer shall take charge or
      control of the Depositor or of its property or affairs for
      the purpose of rehabilitation, conservation or liquidation,
      then in any such case, the Trustee may:  (1) appoint a
      successor depositor (which may be the Trustee) who shall act
      hereunder in all respects in place of the Depositor which
      successor shall be satisfactory to the Trustee, and which
      may be compensated at the times specified in Section 3.05,
      at rates deemed by the Trustee to be reasonable under the
      circumstances, by deduction from the Interest Account of the
      Trust or, to the extent funds are not available in such
      Account, from the Principal Account of the Trust but no such
      deduction shall be made exceeding such reasonable amount as
      the Securities and Exchange Commission may prescribe in
      accordance with Section 26(a)(2)(C) of the Investment
      Company Act of 1940, or (2) terminate this Agreement and the
      trust created hereby and liquidate the Trust in the manner
      provided in Section 9.02;

            (g)  if at any time the value of Securities held in
      the Trust including supplemental deposits, if any, of
      Securities theretofore in the Trust as shown by any
      evaluation by the Trustee pursuant to Section 5.01 hereof
      shall be less than 40% of the value of Securities
      theretofore deposited in the Trust, the Trustee shall, when
      so directed by the Depositor, terminate this Indenture and
      the trust created hereby and liquidate the Trust, all in the
      manner provided in Section 9.02;

            (h)  the Trustee is authorized and empowered at the
      request and direction of the Depositor to execute and file
      on behalf of the Trust any and all documents, in connection
      with consents to service of process, required to be filed
      under the securities laws of the various States in order to
      permit the sale of Units of the Trust in such States by the
      Depositor;

            (i)  in no event shall the Trustee be liable for any
      taxes or other governmental charges imposed upon or in
      respect of the Securities or






<PAGE>

                                   -41-



      upon the interest thereon or upon it as Trustee hereunder or
      upon or in respect of the Trust which it may be required to
      pay under any present or future law of the United States of
      America or of any other taxing authority having jurisdiction
      in the premises.  For all such taxes and charges and for any
      expenses, including counsel fees, which the Trustee may
      sustain or incur with respect to such taxes or charges, the
      Trustee shall be reimbursed and indemnified out of the
      Reserve Account and/or the Interest and Principal Accounts
      of the Trust, and the payment of such amounts so paid by the
      Trustee shall be secured by a lien on the Trust prior to the
      interests of the Unit Holders; and

            (j)  the Trustee except by reason of its own gross
      negligence, bad faith or willful misconduct shall not be
      liable for any action taken, omitted or suffered to be taken
      by it in good faith and believed by it to be authorized or
      within the discretion or rights or powers conferred upon it
      by this Indenture.

            Section 6.02  Books, Records and Reports:  The Trustee shall
keep proper books of record and account of all the transactions under this
Indenture at its unit investment trust office including a record of the
name and address of, the Units held by, and the Certificates issued by the
Trust and held by, every Unit Holder, and the books and records shall be
open to inspection by any Unit Holder of the Trust at all reasonable times
during the usual business hours of the Trustee.

            The Trustee shall make such annual or other reports as may from
time to time be required under any applicable state or federal statute or
rule or regulation thereunder.

            Section 6.03  Indenture and List of Securities on File:  The
Trustee shall keep a certified copy in duplicate original of this Indenture
(including the Reference Trust Agreement) on file at its unit investment
trust office available for inspection at all reasonable times during the
usual business hours by any Unit Holder, together with a current list of
the Securities in the Trust.





<PAGE>

                                   -42-



            Section 6.04  Compensation:  For services performed under this
Indenture the Trustee shall be paid an amount set forth in Part II of the
Reference Trust Agreement per $1,000 principal amount of Securities in the
Trust.  Such compensation shall be computed on the basis of the greatest
amount of such principal amount of Bonds in the Trust at any time during
the period with respect to which such compensation is made.  The Trustee
may from time to time adjust its computation set forth above; provided,
however, that the total adjustment upward does not, at the effective time
of such adjustment, exceed the percentage of the total increase, after the
date hereof, in consumer prices for services as measured by the United
States Department of Labor Consumer Price Index entitled "All Services Less
Rent" or, if such Index is no longer published, in a similar index to be
determined by the Trustee and the Depositor.  Further provided, however,
that the right of the Trustee to increase its fees shall not be cumulative
and, if not exercised by the Trustee for any calendar year, shall be deemed
waived for such calendar year.  No exercise of its right to such increase
shall be effective unless made by the Trustee by means of notification to
the Depositor within 60 days following the publication of the annual
consumer price information referred to above.  After the effective time of
any such adjustment or increase, the Trustee shall also be entitled to
charge an additional reasonable fee at a rate or amount to be determined by
the Trustee and the Depositor based upon the face amount of Deposited Units
in the Trust for the Trustee's services in such Deposited Units.  The
consent or concurrence of any Unit Holder hereunder shall not be required
for any such adjustment or increase.  Such compensation shall be deemed to
provide only for the usual normal and proper functions undertaken as
Trustee pursuant to this Indenture.  The Trustee may charge the Interest
and Principal Accounts of the Trust the fees of counsel which may be
retained by the Trustee in connection with its activities hereunder, and
disbursements incurred hereunder and additional compensation for any
extraordinary services performed by the Trustee hereunder.  In addition,
the Trustee may charge the Interest and Principal Accounts of the Trust for
any and all expenses (including, but not limited to, legal, auditing and
printing expenses) of maintaining registration or qualification of the
Units and/or the Trust under Federal or state securities laws subsequent to
initial registration so long as the Depositor is maintaining a market for
the Units, provided, however, that no portion of such amount shall be
deducted or paid unless payment thereof from the Trust is at that time
lawful.  The Trustee shall be indemnified by the Trust and held harmless
against any loss or



<PAGE>

                                   -43-



liability accruing to it without gross negligence, bad faith or willful
misconduct on its part, arising out of or in connection with the acceptance
or administration of the Trust, including the costs and expenses (including
counsel fees) of defending itself against any claim of liability in the
premises.  If the cash balances in the Interest and Principal Accounts of
the Trust shall be insufficient to provide for amounts payable pursuant to
this Section 6.04, the Trustee shall have the power to sell (i) Securities
of the Trust from the current list of Securities designated to be sold
pursuant to Section 5.02 hereof, or (ii) if no such Securities have been so
designated such Securities of the Trust as the Trustee may see fit to sell
in its own discretion, and to apply the proceeds of any such sale in
payment of the amounts payable pursuant to this Section 6.04.  The Trustee
shall not be liable or responsible in any way for depreciation or loss
incurred by reason of any sale of Securities made pursuant to this Section
6.04.  Any moneys payable to the Trustee pursuant to this Section shall be
secured by a lien on the Trust prior to the interests of the Unit Holders.

            In the event that settlement or delivery of Contract Securities
does not occur prior to the First Settlement Date, the Trustee shall reduce
the level of its compensation specified in Section 6.04(a) by an amount
equal to the amount of interest which would have accrued on such Securities
from the First Settlement Date of the Units to the respective delivery
dates of such Securities.

            In the event that Securities (1) are issued later than their
expected date(s) of issue (but no more than two months after such expected
date in the case of Securities originally designated for deposit in the
Trust) and (2) are deemed not to be failed Contract Securities, the Trustee
shall also reduce its fee by an amount equal to the amount of interest
which would have accrued on such Securities from the expected date of issue
to the actual date of issue.  If the Trustee's fee is inadequate to cover
this additional amount of accrued interest, the Securities shall be deemed
and treated as failed Contract Bonds.  The Depositor shall reimburse the
Trustee for any reduction in its fee at the times such fee would be payable
pursuant to Section 3.05.

            Section 6.05  Removal and Resignation of Trustee; Successor:
The following provisions shall govern the removal and resignation of the
Trustee and the appointment of any successor trustee:




<PAGE>

                                   -44-



            (a)  the Trustee or any trustee or trustees hereafter
      appointed may resign and be discharged of the trusts created
      by this Indenture, by executing an instrument in writing
      resigning as Trustee of the Trust and filing the same with
      the Depositor and mailing a copy of a notice of resignation
      to all Unit Holders then of record, not less than sixty days
      before the date specified in such instrument when, subject
      to Section 6.05(e), such resignation is to take effect.
      Upon receiving such notice of resignation, the Depositor
      shall promptly appoint a successor trustee as hereinafter
      provided, by written instrument, in duplicate, one copy of
      which shall be delivered to the resigning Trustee and one
      copy to the successor trustee.  If at any time the Trustee
      shall become incapable of acting, or shall have an order of
      relief entered with respect to it, or a receiver of the
      Trustee or of its property shall be appointed, or any public
      officer shall take charge or control of the Trustee or of
      its property or affairs for the purposes of rehabilitation,
      conservation or liquidation, or upon the determination of
      the Depositor to remove the Trustee for any reason, either
      with or without cause, including but not limited to a
      determination by the Depositor that the Trustee has
      materially failed to perform its duties under this Indenture
      and the interest of Unit Holders has been substantially
      impaired as a result, and such failure has continued for a
      period of sixty days following the Trustee's receipt of
      notice of such determination by the Depositor, then in any
      such case the Depositor may remove the Trustee and appoint a
      successor trustee by written instrument, in duplicate, one
      copy of which shall be delivered to the Trustee so removed
      and one copy to the successor trustee; provided that a
      notice of such removal and appointment of a successor
      trustee shall be mailed by the Depositor to each Unit Holder
      then of record;

            (b)  any successor trustee appointed hereunder shall
      execute, acknowledge and deliver to the Depositor and to the
      retiring Trustee an instrument accepting such appointment
      hereunder, and such successor trustee without any further




<PAGE>

                                   -45-



      act, deed or conveyance shall become vested with all the
      rights, powers, duties and obligations of its predecessor
      hereunder with like effect as if originally named Trustee
      herein and shall be bound by all the terms and conditions of
      this Indenture.  Upon the request of such successor trustee,
      the Depositor and the retiring Trustee shall, upon payment
      of any amounts due the retiring Trustee, or provision
      therefor to the satisfaction of such retiring Trustee,
      execute and deliver an instrument acknowledged by them
      transferring to such successor trustee all the rights and
      powers of the retiring Trustee; and the retiring Trustee
      shall transfer, deliver and pay over to the successor
      trustee all Securities and moneys at the time held by it
      hereunder, together with all necessary instruments of
      transfer and assignment or other documents properly executed
      necessary to effect such transfer and such of the records or
      copies thereof maintained by the retiring Trustee in the
      administration hereof as may be requested by the successor
      trustee, and shall thereupon be discharged from all duties
      and responsibilities under this Indenture.  The retiring
      Trustee shall, nevertheless, retain a lien upon all
      Securities and moneys at the time held by it hereunder to
      secure any amounts then due the retiring Trustee;

            (c)  in case at any time the Trustee shall resign and
      no successor trustee shall have been appointed and have
      accepted appointment within thirty days after notice of
      resignation has been received by the Depositors, the
      retiring Trustee may forthwith apply to a court of competent
      jurisdiction for the appointment of a successor trustee.
      Such court may thereupon, after such notice, if any, as it
      may deem proper and prescribe, appoint a successor trustee;

            (d)  any corporation into which any trustee hereunder
      may be merged or with which it may be consolidated, or any
      corporation resulting from any merger or consolidation to
      which any trustee hereunder shall be a party, or any
      corporation succeeding to all or substantially all of the
      business of the Trustee shall be the successor trustee under
      this Indenture without the execution



<PAGE>

                                   -46-



      or filing of any paper, instrument or further act to be done
      on the part of the parties hereto, anything herein, or in
      any agreement relating to such merger or consolidation, by
      which any such trustee may seek to retain certain powers,
      rights and privileges theretofore obtaining for any period
      of time following such merger or consolidation, to the
      contrary notwithstanding; and

            (e)  any resignation or removal of the Trustee and
      appointment of a successor trustee pursuant to this Section
      shall become effective upon acceptance of appointment by the
      successor trustee as provided in subsection (b) hereof.

            Section 6.06  Qualifications of Trustee:  The Trustee shall be
a corporation organized and doing business under the laws of the United
States or any state thereof, which is authorized under such laws to
exercise corporate trust powers and having at all times an aggregate
capital, surplus, and undivided profits of not less than $5,000,000.

                                ARTICLE VII

                          Rights of Unit Holders

            Section 7.01  Beneficiaries of Trust:  By the purchase and
acceptance or other lawful delivery and acceptance of a Unit of the Trust
the Unit Holder shall be deemed to be a beneficiary of such Trust and
vested with all right, title and interest in the Trust attributable to such
Unit, subject to the terms and conditions of this Indenture and of the
Certificate evidencing such Unit.

            Section 7.02  Rights, Terms and Conditions:  In addition to the
other rights and powers set forth in the other provisions and conditions of
this Indenture, the Unit Holders shall have the following rights and powers
and shall be subject to the following terms and conditions:

            (a)  a Unit Holder may at any time prior to the
      Trustee's close of business as of the date on which the
      Trust is terminated tender his Units to the Trustee for
      redemption in accordance with Section 5.02;




<PAGE>

                                   -47-



            (b)  the death or incapacity of any Unit Holder shall
      not operate to terminate this Indenture or the Trust, nor
      entitle his legal representatives or heirs to claim an
      accounting or to take any action or proceeding in any court
      of competent jurisdiction for a partition or winding up of
      the Trust, nor otherwise affect the rights, obligations and
      liabilities of the parties hereto or any of them.  Each Unit
      Holder expressly waives any right he may have under any rule
      of law, or the provisions of any statute, or otherwise, to
      require the Trustee at any time to account, in any manner
      other than as expressly provided in this Indenture, in
      respect of the Securities or moneys from time to time
      received, held and applied by the Trustee hereunder; and

            (c)  no Unit Holder shall have any right to vote or in
      any manner otherwise control the operation and management of
      the Trust or the obligations of the parties hereto, nor
      shall anything herein set forth, or contained in the terms
      of the Certificates, be construed so as to constitute the
      Unit Holders from time to time as partners or members of any
      association; nor shall any Unit Holder ever be under any
      liability to any third persons by reason of any action taken
      by the parties to this Indenture, or any other cause
      whatsoever.

                               ARTICLE VIII

                                 Depositor

            Section 8.01  Liabilities; Power of Attorney:  The Depositor,
or the Depositors if there be more than one, shall be severally liable in
accordance herewith for the obligations imposed upon and undertaken by the
Depositor hereunder, provided, however, that, without in any way affecting
or diminishing such several liability, each Depositor of the Trust shall
indemnify the other Depositors thereof and hold such other Depositors
harmless from and against any and all costs, expenses and liabilities
(including attorneys' fees) which such other Depositors may suffer or incur
as a result of or by reason of any act or failure to act hereunder on the
part of the indemnifying Depositor.  At all times prior to the termination
of the Trust and while the Depositors thereof shall



<PAGE>

                                   -48-



continue to act jointly hereunder, there shall be maintained on file with
the Trustee a power of attorney executed in favor of one Depositor by the
other Depositors constituting and appointing the nonexecuting Depositor the
true and lawful agent and attorney-in-fact of the executing Depositors to
execute and deliver for and on behalf of the executing Depositors any and
all notices, opinions, certificates, lists, demands, directions,
instruments, or other documents provided or permitted to be executed or
delivered by the Depositors hereunder in connection with the Trust or to
take any other action in respect hereof.  Such power of attorney shall
continue in effect as to the executing Depositors until written notice of
revocation thereof has been given by such executing Depositors to the
Trustee.  Prior to receipt of such notice of revocation the Trustee shall
be entitled to rely conclusively upon such power of attorney as authorizing
the non-executing Depositor to give any notice, opinion, certificate, list,
demand, direction, instrument or other document provided for or permitted
hereunder or to take any other action in respect hereof on behalf of the
executing Depositors as to which such power of attorney is in effect.

            Section 8.02  Discharge:  (i)  If there be more than one
Depositor, the following provisions shall provide for the discharge of a
Depositor and the liability of the Depositors in the event of the discharge
of a Depositor:

            (a)  in the event that any Depositor shall fail to
      undertake or perform any of the duties which by the terms of
      this Agreement are required by it to be undertaken or
      performed and such failure shall continue for 30 days after
      notice to the Depositors from the Trustee or if any
      Depositor shall become incapable of acting or shall have an
      order of relief entered with respect to it, or a receiver of
      the property of any Depositor shall be appointed or any
      public officer shall take charge or control of any Depositor
      or its property or affairs for the purpose of
      rehabilitation, conservation or liquidation, then such
      Depositor shall forthwith be and shall be deemed to be
      discharged forever as a Depositor hereunder and thereupon
      the remaining Depositors shall act hereunder without the
      necessity of any other or further action on its part or on
      the part of the Trustee;




<PAGE>

                                   -49-



            (b)  in the event that the power of attorney referred
      to in Section 8.01 shall be revoked by written notice given
      by an executing Depositor and it shall not be replaced
      within one business day by another power of attorney
      conforming with the requirements of said Section 8.01, the
      Depositors of the Trust shall be deemed to have been unable
      to reach agreement with respect to action to be taken
      jointly by them hereunder in connection with the Trust and
      thereupon the Depositor which has revoked the power of
      attorney executed by it shall be discharged hereunder upon
      the expiration of such one-day period and thereupon the
      other Depositors shall act hereunder without the necessity
      of any other or further action on their part or on the part
      of the Trustee;

            (c)  notwithstanding the discharge of a Depositor of
      the Trust in accordance with this Section 8.02, such
      Depositor shall continue to be fully liable in accordance
      with the provisions hereof in respect of action taken or
      refrained from under this Agreement by the Depositors before
      the date of such discharge or by the undischarged Depositors
      before or after the date of such discharge, as fully and to
      the same extent as if no discharge has occurred.

           (ii)  If there is only one Depositor the following provisions
shall provide for the discharge of the Depositor and the liability of the
Depositor in the event of the discharge of the Depositor:

            (a)   in the event that the Depositor shall fail to
      undertake or perform any of the duties which by the terms of
      this Agreement are required by it to be undertaken or
      performed and such failure shall continue for thirty days
      after notice to the Depositor from the Trustee or if the
      Depositor shall become incapable of acting or shall be
      adjudged a bankrupt or insolvent, or a receiver of the
      property of the Depositor shall be appointed or any public
      officer shall take charge or control of the Depositor or its
      property or affairs for the purpose of rehabilitation,
      conservation or liquidation, then such Depositor




<PAGE>

                                   -50-




      shall forthwith be and shall be deemed to be
      discharged forever as a Depositor hereunder;

            (b)   notwithstanding the discharge of a
      Depositor in accordance with this Sec-
      tion 8.02(ii), such Depositor shall continue to be
      fully liable in accordance with the provisions
      hereof in respect of action taken or refrained
      from under this Agreement by the Depositor before
      the date of such discharge as fully and to the
      same extent as if no discharge had occurred.

            Section 8.03  Successors:  The covenants, provisions
and agreements herein contained shall in every case be binding
upon any successor or successors to any Depositor and shall be
binding upon the General Partners of any Depositor which may be
a partnership and upon the capital interest of the limited
partners of any Depositor which may be a partnership.  In the
event of the death, resignation or withdrawal of any partner of
any Depositor which may be a partnership, the partner so dying,
resigning or withdrawing shall be relieved of all further
liability hereunder if at the time of such death, resignation
or withdrawal such Depositor maintains a net worth (determined
in accordance with generally accepted accounting principles) of
at least $1,000,000.  In the event of an assignment by any
Depositor to a successor corporation or partnership as
permitted by the next following sentence, such Depositor and,
if such Depositor is a partnership, its partners shall be
relieved of all further liability under this Agreement.  Any
Depositor may transfer all or substantially all of its assets
to a corporation or partnership which carries on the business
of such Depositor, if at the time of such transfer such
successor duly assumes all the obligations of such Depositor
under this Agreement.

            Section 8.04  Resignation:  If at any time the
Depositor of the Trust shall desire to resign its position as
such a Depositor hereunder, the Depositor desiring to resign
may resign by delivering to the Trustee an instrument executed
by such resigning Depositor and, upon such delivery, the
resigning Depositor shall be discharged and shall no longer be
liable in any manner hereunder except as to acts or omissions
occurring prior to such delivery; provided, however, that if
upon such resignation there would be no Depositor then acting,
concurrently with or subsequent to such resignation the Trustee
shall proceed as provided in Section 6.01(f).  Such new
Depositor shall not be under any liability hereunder for




<PAGE>

                                   -51-



occurrences or omissions prior to the effective time of
execution of such instrument.

            Section 8.05  Additional Depositors:  The Depositor
of the Trust and the Trustee may at any time appoint one or
more corporations or partnerships to act as new Depositor of
such Trust, in addition to those currently serving, by an
instrument executed by such Depositor, the Trustee, and such
corporations or partnerships; provided, however, that at the
time of such execution each new Depositor maintains a net worth
(determined in accordance with generally accepted accounting
principles) of at least $1,000,000.  Upon such execution, a new
Depositor shall be deemed to be a depositor for all purposes
under this Indenture, and the covenants, provisions and
agreements herein contained shall in every case be binding upon
such new Depositor and shall be binding upon the General
Partner of any such new Depositor which may be a partnership
and upon the capital interest of the limited partners of any
such new Depositor which may be a partnership, but such new
Depositor shall not be liable hereunder for occurrences or
omissions prior to the effective time of execution of such
instrument.

            Section 8.06  Exclusions from Liability:  The
following provisions shall provide for certain exclusions from
the liability of the Depositor:

            (a)  no Depositor of the Trust shall be under
      any liability to any other Depositor of the Trust,
      such Trust or the Unit Holders thereof, for any
      action taken or for refraining from the taking of
      any action in good faith pursuant to this
      Agreement, or for errors in judgment or liable or
      responsible in any way for depreciation or loss
      incurred by reason of the acquisition or sale of
      any Securities; provided, however, that this
      provision shall not protect the Depositor against
      any liability to which it would otherwise be
      subject by reason of willful misfeasance, bad
      faith or gross negligence in the performance of
      its duties or by reason of its reckless disregard
      of its obligations and duties hereunder.  The
      Depositor of the Trust may rely in good faith on
      any paper, order, notice, list, affidavit,
      receipt, evaluation, opinion, endorsement,
      assignment, draft or any other document of any
      kind prima facie properly executed and submitted




<PAGE>

                                   -52-



      to them, or any of them, by any other Depositor of
      the Trust, the Trustee, bond counsel, the
      Evaluator or any other person.  The Depositor
      shall in no event be deemed to have assumed or
      incurred any liability, duty, or obligation to any
      Unit Holder, the Evaluator or the Trustee other
      than as expressly provided for herein;

            (b)  the Depositor shall not be under any
      obligation to appear in, prosecute or defend any
      legal action which in its opinion may involve it
      in any expense or liability; provided, however,
      that the Depositor may in its discretion undertake
      any such action which it may deem necessary or
      desirable in respect of this Agreement and the
      rights and duties of the parties hereto and the
      interests of the Unit Holders hereunder;

            (c)  none of the provisions of this Agreement
      shall be deemed to protect or purport to protect
      the Depositor of the Trust against any liability
      to the Trust or to the Unit Holders thereof or to
      each other (if there is more than one Depositor)
      to which the Depositor would otherwise be subject
      by reason of willful misfeasance, bad faith or
      gross negligence in the performance of the duties
      of the Depositor, or by reason of the Depositor's
      reckless disregard of the obligations and duties
      of the Depositor under this Agreement.

            Section 8.07  Compensation:  The Depositor shall
receive at the times set forth in Section 3.05 as compensation
for performing portfolio supervisory services, such amount and
for such periods as are specified in the Reference Trust
Agreement.  The computation of such compensation shall be made
on the basis of the aggregate face amount of Bonds in the Trust
at any time during the period for which such compensation is
being computed.  At no time, however, will the total amount
received by the Depositor for services rendered to all series
of the Dean Witter Select Government Trust in any calendar year
exceed the aggregate cost to it of supplying such services in
such calendar year except to the extent permitted by law.  Such
rate may be increased from time to time, without the consent or
approval of any Certificateholder or the Trustee, by amounts
not exceeding the percentage of the total increase during the
period from the date of such Reference Trust Agreement to the
date of such increase, in consumer prices for services as




<PAGE>

                                   -53-



measured by the United States Department of Labor Consumer
Price Index "All Services Less Rent" or, if such Index is no
longer published, a similar index.

            The Depositor shall receive, as reimbursement for any
bookkeeping and related administrative services performed by
the Depositor on behalf of the Trust of a character normally
performed by the Trustee, such amounts as the Depositor, in
writing, shall direct the Trustee to pay, provided that the
total amount paid to the Depositor for such services in any
calendar year shall not exceed the aggregate cost to the
Depositor of supplying such services in such calendar year,
except to the extent permitted by law and provided further that
the Trustee shall not reimburse the Depositor for services
currently performed for the Trust by the Trustee.

                               ARTICLE IX

          Additional Covenants; Miscellaneous Provisions

            Section 9.01  Amendments:  This Indenture may be
amended from time to time by the parties hereto or their
respective successors, without the consent of any of the Unit
Holders, (a) to cure any ambiguity or to correct or supplement
any provision contained herein which may be defective or
inconsistent with any other provision contained herein; or
(b) to make such other provision in regard to matters or
questions arising hereunder as shall not adversely affect the
interests of the Unit Holders; provided, that the Indenture may
also be amended by the Depositor and the Trustee (or the
performance of any of the provisions of the Indenture may be
waived) with the consent of Unit Holders evidencing 51% of the
Units at the time outstanding for the purposes of adding any
provisions to or changing in any manner or eliminating any of
the provisions of the Indenture or of modifying in any manner
the rights of Unit Holders; provided, further, that this
Indenture (including any Reference Trust Agreement) may not be
amended (nor may any provision thereof be waived) so as to
(1) increase the number of Units issuable in respect of the
Trust above the aggregate number specified in Part II of the
Reference Trust Agreement or such lesser amount as may be
outstanding at any time during the term of this Indenture
except as the result of the deposit of Additional Securities,
as herein provided, or reduce the relative interest in the
Trust of any Unit Holder without his consent, (2) permit the
deposit or acquisition hereunder of interest-bearing
obligations or other securities or other property either in




<PAGE>

                                   -54-



addition to or in substitution for any of the Bonds except in
the manner permitted by the Trust Indenture as in effect on the
date of the first deposit of Securities under a particular
Indenture or permit the Trustee to engage in business or
investment activities not specifically authorized in this
Indenture as originally adopted or (3) adversely affect the
characterization of the Trust as a grantor trust for federal
income tax purposes.

            Promptly after the execution of any such amendment
the Trustee shall furnish written notification to all holders
of then outstanding Units of the substance of such amendment.

            Section 9.02  Termination:  The Trust shall terminate
upon the maturity, redemption, sale or other disposition as the
case may be of the last Security held in the Trust unless
sooner terminated as hereinbefore specified and may be
terminated at any time by the written consent of the Holders of
Fifty One per cent of the Units of the Trust; provided, that in
no event shall the Trust continue beyond the Termination Date.
Written notice of any termination, specifying the time or times
at which the Unit Holders of such Trust may surrender any
Certificates they hold for cancellation shall be given by the
Trustee to each Unit Holder at his address appearing on the
registration books of the Trustee.  Within a reasonable period
of time after termination of the Trust the Trustee shall fully
liquidate the Securities of the Trust then held, if any, and
shall:

            (a)  deduct from the Interest Account of the
      Trust or, to the extent that funds are not
      available in such Account, from the Principal
      Account of the Trust and pay to itself
      individually an amount equal to the sum of (1) its
      accrued compensation for its ordinary recurring
      services in connection with the Trust, (2) any
      compensation due it for its extraordinary services
      and (3) any costs, expenses or indemnities in
      connection with the Trust as provided herein;

            (b)  deduct from the Interest Account of the
      Trust or, to the extent that funds are not
      available in such Account, from the Principal
      Account of the Trust and pay any unpaid fees and
      expenses of bond counsel in connection with the
      Trust, of the Depositor and of the Evaluator, if





<PAGE>

                                   -55-



      any, as directed and certified to by the
      Depositor;

            (c)  deduct from the Interest Account of the
      Trust or the Principal Account of the Trust any
      amounts which may be required to be deposited in
      the Reserve Account of the Trust to provide for
      payment of any applicable taxes or other
      governmental charges and any other amounts which
      may be required to meet expenses incurred under
      this Indenture in connection with the Trust;

            (d)  distribute to each Unit Holder of the
      Trust, upon surrender for cancellation of his
      Certificate or Certificates, such Holder's pro
      rata share of the balance of the Interest Account
      of the Trust;

            (e)  together with such distribution to each
      Unit Holder as provided for in (d) and (e),
      furnish to each such Unit Holder a final
      distribution statement as of the date of the
      computation of the amount distributable to Unit
      Holders, setting forth the data and information in
      substantially the form and manner provided for in
      Section 3.06 hereof.

            The amounts to be so distributed to each Unit Holder
shall be that pro rata share of the balance of the total
Interest and Principal Accounts of the Trust as shall be
represented by the Units therein held of record by such Unit
Holder.

            The Trustee shall be under no liability with respect
to moneys held by it in the Interest and Principal Accounts of
the Trust or the Reserve Account with respect to the Trust upon
termination except to hold the same in trust without interest
until disposed of in accordance with the terms of this
Indenture.

            In the event that all of the Unit Holders who hold
Certificates of the Trust shall not surrender their
Certificates for cancellation within six months after the time
specified in the above-mentioned written notice, the Trustee
shall give a second written notice to the remaining holders of
Certificates to surrender their Certificates for cancellation
and receive the liquidation distribution with respect thereto.




<PAGE>

                                   -56-



If within one year after the second notice all the Certificates
shall not have been surrendered for cancellation, the Trustee
may take steps, or may appoint an agent to take appropriate
steps, to contact the remaining holders of Certificates
concerning surrender of their Certificates and the cost thereof
shall be paid out of the moneys and other assets which remain
in trust hereunder.

            Section 9.03  Construction:  This Indenture is
delivered in the State of New York, and all laws or rules of
construction of such State shall govern the rights of the
parties hereto and the Unit Holders and the interpretation of
the provisions hereof.

            Section 9.04  Written Notice:  Any notice, demand,
direction or instruction to be given to the Depositor hereunder
shall be in writing and shall be duly given if mailed or
delivered to the Depositor, c/o Dean Witter Reynolds Inc., Two
World Trade Center, New York, New York 10048, Attention:  Unit
Investment Trust Division, or at such other address as shall be
specified by the Depositor to the other parties hereto in
writing.  Any notice, demand, direction or instruction to be
given to the Trustee shall be in writing and shall be duly
given if mailed or delivered to the unit investment trust
office of the Trustee, 101 Barclay Street, New York, New York
10286, or such other address as shall be specified to the other
parties by the Trustee in writing.  Any notice, demand,
direction or instruction to be given to the Evaluator shall be
in writing and shall be duly given if mailed or delivered to
the Evaluator, Attention:  F.A. Shinal, Senior Vice President,
65 Broadway, New York, New York 10006, or such other address as
shall be specified to the other parties hereto by the Evaluator
in writing.  Any notice to be given to the Unit Holders shall
be duly given if mailed or delivered to each Unit Holder at the
address of such holder appearing on the registration books of
the Trustee.

            Section 9.05  Severability:  If any one or more of
the covenants, agreements, provisions or terms of this
Indenture shall be held contrary to any express provision of
law or contrary to policy of express law, though not expressly
prohibited, or against public policy, or shall for any reason
whatsoever be held invalid, then such covenants, agreements,
provisions or terms shall be deemed severable from the
remaining covenants, agreements, provisions or terms of this
Indenture and shall in no way affect the validity or





<PAGE>

                                   -57-



enforceability of the other provisions of this Indenture or of
the Certificates, or the rights of the Unit Holders.

            Section 9.06  Dissolution of Depositors Not To
Terminate:  The dissolution of one or all of the Depositors (if
more than one) from or for any cause whatsoever shall not
operate to terminate this Indenture insofar as the duties and
obligations of the Trustee and Evaluator are concerned.











<PAGE>

                                   -58-



            IN WITNESS WHEREOF, Dean Witter Reynolds Inc. has
caused this Trust Indenture and Agreement to be executed by one
of its authorized officers and its corporate seal to be hereto
affixed and attested by its Secretary or Assistant Secretary;
The Bank of New York has caused this Trust Indenture and
Agreement to be executed by one of its authorized officers and
its corporate seal to be hereto affixed and attested by one of
its Assistant Secretaries and Kenny S & P Evaluation Services,
a division of Kenny Information Systems, Inc., has caused this
Trust Indenture and Agreement to be executed by facsimile
signature of one of its Vice Presidents or Assistant Vice
Presidents and its corporate seal to be hereto affixed and
attested by facsimile signature by one of its Vice Presidents
or Secretaries; all as of the day, month and year first above
written.


<PAGE>

                                   -59-



                                   DEAN WITTER REYNOLDS INC.,
                                     Depositor



                                   By: John T. Pavick
                                       John T. Pavick
                                   Title:  Vice President





(SEAL)

ATTEST:



BY:  Michael D. Browne
     Michael D. Browne
     Assistant Secretary

<PAGE>

                                   -60-


                              THE BANK OF NEW YORK,
                                   Trustee



                              By:  Nina Bruno
                                   Nina Bruno
                              Title:  Assistant Vice President



(SEAL)

ATTEST:

By:  Paul Kelleher
     Paul Kelleher
     Title:  Assistant Treasurer


STATE OF NEW YORK   )
                    :  ss.:
COUNTY OF NEW YORK  )


     I, Ludim Sanabria , a Notary Public in and for the said
County in the state aforesaid, do hereby certify that
Nina Bruno and Paul Kelleher personally known to me to be the
same persons whose names are subscribed to the foregoing
instrument and personally known to me to be an Assistant Vice
President and Assistant Treasurer respectively of The Bank of New
York, a corporation, appeared before me this day in person, and
acknowledged that they signed, sealed with a corporate seal of
The Bank of New York, and delivered the said instrument as their
free and voluntary act as such Assistant Vice President
and Assistant Treasurer, respectively, and as the free and
voluntary act of said The Bank of New York, for the uses and
purposes therein set forth.

     GIVEN, under my hand and notarial seal this 16th day of
March, 1994.



                                               Ludim Sanabria
                                               Notary Public



(SEAL)

<PAGE>

                                   -61-

                              KENNY INFORMATION SYSTEMS, INC.
                                Evaluator



                              By:  James R. Quandt
                                   James R. Quandt
                                   President



(SEAL)

ATTEST:



F. A. Shinal
F. A. Shinal
Senior Vice President/
Chief Financial Officer


<PAGE>


                  DEAN WITTER SELECT GOVERNMENT TRUST
                  U.S. Treasury Series 7
               REFERENCE TRUST AGREEMENT


            This Reference Trust Agreement dated March 16, 1994
among DEAN WITTER REYNOLDS INC., as Depositor, THE BANK OF NEW
YORK, as Trustee and KENNY S&P EVALUATION SERVICES, as
Evaluator, sets forth certain provisions in full and
incorporates other provisions by reference to the document
entitled "Dean Witter Select Government Trust, Trust Indenture
and Agreement" (the "Basic Agreement") dated March 16, 1994.
Such provisions as are incorporated by reference constitute a
single instrument (the "Indenture").

                             WITNESSETH THAT:

            In consideration of the premises and of the mutual
agreements herein contained, the Depositor, the Trustee, and
the Evaluator agree as follows:

                                    I

                  STANDARD TERMS AND CONDITIONS OF TRUST

            Subject to the provisions of Part II hereof, all the
provisions contained in the Basic Agreement are herein
incorporated by reference in their entirety and shall be
deemed to be a part of this instrument as fully and to the
same extent as though said provisions had been set forth in
full in this instrument.

                                    II

                  SPECIAL TERMS AND CONDITIONS OF TRUST

            The following special terms and conditions are
hereby agreed to:

            A.    The Trust is denominated Dean Witter Select
Government Trust, U.S. Treasury Series 7 (the "Treasury
Trust").

            B.    The securities listed in Schedule A hereto are
those which, subject to the terms of this Indenture, have been
or are to be deposited in trust under this Indenture.





<PAGE>

                                    -2-



            C.    The term, "Depositor" shall mean Dean Witter
Reynolds Inc.

            D.    The aggregate number of Units referred to in
Sections 2.03 and 9.01 of the Basic Agreement is 500,000 for
the Treasury Trust.

            E.    A Unit is hereby declared initially equal to
1/500,000th for the Treasury Trust.

            F.    The distribution on the First Distribution
Date, April 15, 1994, to Unit Holders of record on the first
Record Date, April 9, 1994, shall be a partial distribution in
the amount of $2.35 per 1000 Units.

            G.    The term "First Settlement Date" shall mean
March 24, 1994.

            H.    For the Treasury Trust, the term "Record Date"
shall mean the 9th day of each month commencing April 9,
1994.

            I.    For the Treasury Trust, the term "Distribution
Date" shall mean the 15th day of each month following the
Record Date commencing April 15, 1994.

            J.    The term "Termination Date" shall mean
May 1, 2000.

            K.    For purposes of this Series -- Dean Witter
Select Government Trust, U.S. Treasury Series 7 -- the form of
Certificate set forth in this Indenture shall be appropriately
modified to reflect the title of this Series and such of the
Special Terms and Conditions of Trust set forth herein as may
be appropriate.

            L.    For the Treasury Trust, the Evaluators Fee
shall be a minimum of $10.00 per evaluation plus $0.40 for each
issue of underlying Securities.

            M.    For the Treasury Trust, the Depositor's Annual
Supervision Fee shall be a maximum of $0.25 per $1,000
principal amount of underlying Securities.

            N.    For the Treasury Trust, the Trustee's Annual
Fee as defined in the Indenture shall be $1.32 per $1,000
principal amount of underlying Securities.




<PAGE>

                                    -3-



            O.    With respect to distributions from the
Principal Account only, Record Date shall also mean the first
Business Day following the date of maturity of any Bond prior
to the Termination of the Trust.  The Trustee shall distribute
by mail to each Unit Holder of record at the close of business
on such Record Date such Unit Holder's pro rata share of the
cash balance of the Principal Account as of such Record Date
on the Second Business Day following such Record Date.




<PAGE>
   
                        SCHEDULE OF PORTFOLIO SECURITIES
                      DEAN WITTER SELECT GOVERNMENT TRUST
                             U.S. TREASURY SERIES 7
                              AS OF MARCH 16, 1994
    

   
<TABLE>
<CAPTION>
                                                                                                       COST OF
                                                                                                      SECURITIES
 PORTFOLIO                                                      FACE       COUPON                      TO TRUST
    NO.      TITLE OF SECURITIES CONTRACTED FOR (1)            AMOUNT       RATE     MATURITY DATE      (2)(3)
- -----------  -----------------------------------------------  ---------  ----------  --------------  ------------
<C>          <S>                                              <C>        <C>         <C>             <C>
        1.   U.S. Treasury Note                               $ 100,000      4.625%     02/15/96     $   99,406
        2.   U.S. Treasury Note                                 100,000      6.250%     01/31/97        102,406
        3.   U.S. Treasury Note                                 100,000      5.625%     01/31/98         99,875
        4.   U.S. Treasury Note                                 100,000      5.500%     02/28/99         98,375
        5.   U.S. Treasury Note                                 100,000      5.500%     04/15/00         97,344
                                                                                                     ------------
                                                                                                     $  497,406
                                                                                                     ------------
                                                                                                     ------------
<FN>
- ---------
(1)   The  contracts to purchase Securities were  entered into on March 16, 1994
      with the final settlement date expected to be March 23, 1994.
(2)   Offering prices of Securities are determined by the Evaluator on the basis
      stated under  "Public Offering  of Units  -- Public  Offering Price".  The
      aggregate value based on the bid side evaluation at the Evaluation Time on
      the  Date of Deposit was $497,091, which  is $315 lower than the aggregate
      Cost of Securities to Trust based on the offering side evaluation.
(3)   Other information regarding Securities in the Trust:
      (a)     Purchase   Price   of  Securities   to   Sponsor   was   $497,406.
      (b)  Estimated Annual Interest Income to the Trust is $27,500.
</TABLE>
    

<PAGE>


                 [Letterhead of Cahill Gordon & Reindel]





                              March 16, 1994
Dean Witter Reynolds Inc.
Two World Trade Center
New York, New York  10048


            Re:   Dean Witter Select Government Trust,
                  U.S. Treasury Series 7


Gentlemen:

            We have acted as special counsel for you as
Depositor of the Dean Witter Select Government Trust, U.S.
Treasury Series 7 (the "Trust"), in connection with the
issuance under the Trust Indenture and Agreement, dated
March 16, 1994 and a related Reference Trust Agreement,
dated March 16, 1994 (such Trust Indenture and Agreement and
Reference Trust Agreement collectively referred to as the
"Indenture"), among you, as Depositor, The Bank of New York,
as Trustee and Kenny Information Systems, Inc., as Evaluator,
of units of fractional undivided interest in said Trust (the
"Units") comprising the Units of Dean Witter Select Government
Trust, U.S. Treasury Series 7.  In rendering our opinion
expressed below, we have relied in part upon the opinions and
representations of your officers and upon opinions of counsel
to Dean Witter Reynolds Inc.


<PAGE>

                                    -2-



            Based upon the foregoing, we advise you that, in our
opinion, when the Indenture has been duly executed and
delivered on behalf of the Depositor and the Trustee and when
the certificate evidencing the Units has been duly executed
and delivered by the Depositor and the Trustee in accordance
with the Indenture, the Units will be legally issued, fully
paid and nonassessable by the Trust, and will constitute valid
and binding obligations of the Trust and the Depositor in
accordance with their terms, except that enforceability of
certain provisions thereof may be limited by applicable
bankruptcy, insolvency, reorganization, moratorium or other
similar laws affecting creditors generally and by general
equitable principles.

            We hereby consent to the filing of this opinion as
an exhibit to the Registration Statement (File No. 33-49975)
relating to the Units referred to above and to the use of our
name and to the reference to our firm in said Registration
Statement and the related Prospectus.

                                          Very truly yours,

                                          Cahill Gordon & Reindel







<PAGE>


                      CONSENT OF INDEPENDENT AUDITORS

            We consent to the use of our report dated March 16,
1994, accompanying the financial statements of the Dean Witter
Select Government Trust, U.S. Treasury Series 7 included herein
and to the reference to our Firm as experts under the heading
"Auditors" in the prospectus which is a part of this
registration statement.


                                          Deloitte & Touche

New York, New York
March 16, 1994







<PAGE>




              (Letterhead of Kenny Information System, Inc.)

Dean Witter Reynolds, Inc.
Two World Trade Center
New York, NY  10048

            Re:  Dean Witter Select Government Trust,
                  U.S. Treasury Series 7

Gentlemen:

            We have examined Registration Statement File
No. 33-49975 for the above-captioned trust.  We hereby
acknowledge that Kenny S&P Evaluation Services, a division of
Kenny Information Systems, Inc. is currently acting as the
evaluator for the trust.  We hereby consent to the use in the
Registration Statement of the reference to Kenny S&P
Evaluation Services, a division of Kenny Information Systems,
Inc. as evaluator.

            You are hereby authorized to file a copy of this
letter with the Securities and Exchange Commission.

                                    Sincerely,



                                    F.A. Shinal
                                    Senior Vice President



March 16, 1994



<PAGE>


             (Letterhead of Standard & Poor's Ratings Group)



Mr. Michael D. Browne
Dean Witter Reynolds, Inc.
2 World Trade Center
New York, NY 10048

                  Re:  Dean Witter Select Government Trust
                        U.S. Treasury Series 7
                        (SEC Reg. # 33-49975)

Dear Mr. Browne:

            Pursuant to your request for a Standard & Poor's
rating on the units of the above captioned trust, we have
reviewed the  information presented to us and have assigned an
"AAA" rating to the units in the trust.  The rating is a
direct reflection of the portfolio of the trust, which will be
composed solely of U.S. Treasury Debt Obligations fully
guaranteed as to principal and interest by the full faith and
credit of the United States.

            You have permission to use the name of Standard &
Poor's Ratings Group and the above-assigned rating in
connection with your dissemination of information relating to
these units, provided that it is understood that the rating is
not a "market" rating nor a recommendation to buy, hold, or
sell the units of the trust.  Further, it should be understood
the rating does not take into account the extent to which fund
expenses or portfolio asset sales for less than the fund's
purchase price will reduce payment to the unit holders of the
interest and principal required to be paid on the portfolio
assets.  S&P reserves the right to advise its own clients,
subscribers, and the public of the rating.  S&P relies on the
sponsor and its counsel, accountants, and other experts for
the accuracy and completeness of the information submitted in
connection with the rating.  S&P does not independently verify
the truth or accuracy of any such information.

            This letter evidences our consent to the use of the
name of Standard & Poor's Ratings Group and the above-assigned



<PAGE>


rating in the registration statement or prospectus relating to
the units or the trust.  However, this letter should not be
construed as a consent by us, within the meaning of Section 7
of the Securities Act of 1933, to the use of the name of
Standard & Poor's Ratings Group in connection with the ratings
assigned to the securities contained in the trust.  You are
hereby authorized to file a copy of this letter with the
Securities and Exchange Commission.

            Please be certain to send us three copies of your
final prospectus as soon as it becomes available.  Should we
not receive them within a reasonable time after the closing or
should they not conform to the representations made to us, we
reserve the right to withdraw the rating.

            We are pleased to have had the opportunity to be of
service to you.  Our bill will be sent to you within one
month.  If we can be of further help, please do not hesitate
to call upon us.

                                          Sincerely,



                                          Hyman C. Grossman


March 16, 1994





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