WITTER DEAN SEL EQU TR MORG STAN DEAN WIT REIT PORT SEL 98-1
S-6/A, 1998-05-20
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<PAGE>

   
                Registration Number:  333-49917
    
           Filer:  DEAN WITTER SELECT EQUITY TRUST*

                  MORGAN STANLEY DEAN WITTER

                  REIT PORTFOLIO SERIES 98-1

              Investment Company Act No. 811-5065

              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 EQUITY TRUST*,
         MORGAN STANLEY DEAN WITTER
         REIT PORTFOLIO SERIES 98-1
    
     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







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

*    Formerly Dean Witter Select Equity Trust, REIT SERIES 1
<PAGE>

   
     D.  Name and complete address of agent 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
         New York, New York  10005

     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:

         N/A

     H.  Approximate date of proposed sale to public:

         AS SOON AS PRACTICABLE AFTER THE EFFECTIVE DATE OF THE
         REGISTRATION STATEMENT.

         The registrant hereby amends this Registration Statement on such 
         date or dates as may be necessary to delay its effective date until 
         the registrant shall file a further amendment which specifically 
         states that this Registration Statement shall thereafter become 
         effective in accordance with Section 8(a) of the Securities Act of 
         1933 or until the Registration Statement shall become effective on 
         such date as the Commission, acting pursuant to said Section 8(a), 
         may determine.
<PAGE>

   
               DEAN WITTER SELECT EQUITY TRUST,
                  MORGAN STANLEY DEAN WITTER
                  REIT PORTFOLIO SERIES 98-1
    
                     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   )

2.   Name and address of Depositor     )  Table of Contents

3.   Name and address of Trustee       )  Table of Contents

4.   Name and address of principal     )  Table of Contents
     Underwriter                       )

5.   Organization of Trust             )  Introduction

6.   Execution and termination of      )  Introduction; Amendment
     Indenture                         )  and Termination of the
                                       )  Indenture

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

8.   Fiscal Year                       )  Included in Form
                                          N-8B-2

9.   Litigation                        )  *






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

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


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



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

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

     (b)  Type of Securities           )  Administration of the
          (Cumulative or Distributive) )  Trust - Distribution

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

     (d)  Rights of Holders as to      )  Public Offering of Units
          conversion, transfer,        )  - Secondary Market; Exchange
          partial redemption and       )  Option; Redemption; Rights of 
          similar matters              )  Unit Holders -Certificates

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

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

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

          (1)  Composition of assets   )  Administration of the
               of Trust                )  Trust - Reports to Unit
                                       )  Holders; The Trust - Summary
                                       )  Description of the Portfolios
          (2)  Terms and Conditions    )  Amendment and Termination
               of Trust's Securities   )  of the Indenture

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

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


          (3)  Provisions of Indenture )  Amendment and Termination of 
                                       )  the Indenture
          (4)  Identity of Depositor   )  Sponsor; Trustee
               and Trustee             )

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

          (1)  Composition of assets   )  Amendment and Termination
               of Trust                )  of the Indenture
          (2)  Terms and conditions    )  Amendment and Termination
               of Trust's Securities   )  of the Indenture
          (3)  Provisions of           )  Amendment and Termination
               Indenture               )  of the Indenture
          (4)  Identity of Depositor   )  *
               and Trustee             )


     (i)  Other principal features     )  Cover of Prospectus; Tax
          of the Trust's Securities    )  Status

11.  Type of securities comprising     )  The Trust - Summary Description
     units                             )  of the Portfolios; Objectives 
                                       )  and Securities Selection; The
                                       )  Trust - 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                 )






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

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


     (c)  Certain percentages          )  Summary of Essential In
                                       )  formation; Public Offer-
                                       )  ing of Units - Public Of-
                                       )  fering Price; - Profit of
                                       )  Sponsor; - Volume Dis-
                                       )  count

     (d)  Price differentials          )  Public Offering of Units
                                       )  - Public Offering Price
                                       )

     (e)  Certain other loads, fees,   )  Rights of Unit Holders -
          expenses, etc. payable by    )  Certificates
          holders

     (f)  Certain profits receivable   )  Redemption - Purchase by
          by depositor, principal      )  the Sponsors of Units
          underwriters, trustee or     )  Tendered for Redemption
          affiliated persons           )

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

14.  Issuance of trust's securities    )  Introduction; Rights of
                                       )  Unit Holders - Certifi-
                                       )  cates

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

16.  Acquisition and disposition of    )  Introduction; Amendment
     underlying securities             )  and Termination of the
                                       )  Indenture; Objectives and
                                       )  Securities Selection; The
                                       )  Trust - Summary Descrip-
                                       )  tion of the Portfolio;
                                       )  Sponsor - Responsibility
                                       )
                                       )

17.  Withdrawal or redemption          )  Redemption; Public Offer-
                                       )  ing of Units - Secondary
                                       )  Market



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

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


18.  (a)  Receipt and disposition of   )  Administration of the
          income                       )  Trust; Reinvestment Pro-
                                       )  grams

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

     (c)  Reserves or special fund     )  Administration of the
                                       )  Trust - Distribution

     (d)  Schedule of distribution     )  *

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

20.  Certain miscellaneous provi-      )  Amendment and Termination
     sions of the trust agreement      )  of the Indenture; Sponsor
                                       )  - Limitation on Liability
                                       )  - Resignation; Trustee
                                       )  - Limitation on Liability
                                       )  - Resignation

21.  Loans to security holders         )  *

22.  Limitations on liability of de-   )  Sponsor, Trustee; Evalua-
     positor, trustee, custodian,      )  tor - Limitation on Li-
     etc.                              )  ability

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

24.  Other material provisions of      )  *
     the trust agreement               )

     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
                                       )


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

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


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

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

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

30.  Persons controlling Depositor     )  *

31.  Compensation of Officers and      )  *
     Directors of Depositor            )

32.  Compensation of Directors of      )  *
     Depositor                         )

33.  Compensation of employees of      )  *
     Depositor                         )

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

     IV.  DISTRIBUTION AND REDEMPTION OF SECURITIES

35.  Distribution of trust's securi-   )  Public Offering of Units
     ties by states                    )  - Public Distribution

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

37.  Revocation of authority to dis-   )  *
     tribute                           )

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        )



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

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


40.  Certain fees received by prin-    )  Public Offering of Units
     cipal underwriter                 )  - Profit of Sponsor
                                       )

41.  (a)  Business of principal un-    )  Sponsor
          derwriter                    )

     (b)  Branch offices of princi-    )  *
          pal underwriter              )

     (c)  Salesman of principal un-    )  *
          derwriter                    )

42.  Ownership of trust's securities   )  *
     by certain persons                )

43.  Certain brokerage commissions     )  *
     received by principal under-      )
     writer                            )

44.  (a)  Method of valuation          )  Public Offering of Units
     (b)  Schedule as to offering      )  *
          price                        )
     (c)  Variation in offering        )  Public Offering of Units
          price to certain persons     )  - Volume Discount; Ex-
                                       )  change Option

45.  Suspension of redemption rights   )  *

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

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

     V.  INFORMATION CONCERNING THE TRUSTEE OR CUSTODIAN

48.  Organization and regulation of    )  Trustee
     Trustee                           )

49.  Fees and expenses of Trustee      )  Expenses and Charges


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

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


50.  Trustee's lien                    )  Expenses and Charges

     VI.  INFORMATION CONCERNING INSURANCE
          OF HOLDERS OF SECURITIES

51.  (a)  Name and address of Insur-   )  *
          ance 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 can-     )  *
          cellation                    )
     (g)  Method of determining pre-   )  *
          miums                        )
     (h)  Amount of aggregate premi-   )  *
          ums paid                     )
     (i)  Persons receiving any part   )  *
          of premiums                  )
     (j)  Other material provisions    )  *
          of the Trust relating to     )
          insurance                    )

     VII.  POLICY OF REGISTRANT

52.  (a)  Method of selecting and      )  Introduction; Objectives
          eliminating securities       )  and Securities Selection;
          from the Trust               )  The Trust - Summary De-
                                       )  scription of the Portfo-
                                       )  lio; Sponsor - Responsi-
                                       )  bility
     (b)  Elimination of securities    )  *
          from the Trust               )
     (c)  Substitution and elimina-    )  Introduction; Objectives
          tion of securities from      )  and Securities Selection;
          the Trust                    )  Sponsor - Responsibility
     (d)  Description of any funda-    )  *
          mental policy of the Trust   )

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







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

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


     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>
Information contained herein is subject to completion or amendment. A
registration statement relating to these securities has been filed with the
Securities and Exchange Commission. These securities may not be sold nor may
offers to buy them be accepted prior to the time the registration statement
becomes effective. This prospectus shall not constitute an offer to sell or the
solicitation of an offer to buy nor shall there be any sale of these securities
in any State in which such offer, solicitation or sale would be unlawful prior
to registration or qualification under the securities laws of such state.
<PAGE>
   
                   SUBJECT TO COMPLETION, DATED MAY 20, 1998
    
 
PARTS A AND B OF THIS PROSPECTUS DO 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.
 
[LOGO] DEAN WITTER SELECT EQUITY TRUST
 
   
MORGAN STANLEY DEAN WITTER REIT PORTFOLIO Series 98-1
    
- -----------------------------------------------------------------------
 
(A Unit Investment Trust)
- -----------------------------------------------------------------------------
 
   
The objectives of the Trust are primarily current income and secondarily the
potential for long term capital appreciation through an investment in a fixed
portfolio of equity securities ("Securities") issued by publicly traded real
estate investment trusts ("REITs") over a period of approximately four years.
The Trust is a fixed portfolio, consisting of the Securities, and share
weightings, as determined as of             , 1998. The value of the Units of
the Trust will fluctuate with the value of the portfolio of underlying
Securities. UNITS OF THE TRUST ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED
OR ENDORSED BY, ANY BANK, AND THE UNITS ARE NOT INSURED BY THE FEDERAL DEPOSIT
INSURANCE CORPORATION, FEDERAL RESERVE BOARD OR ANY OTHER AGENCY. INVESTMENT IN
UNITS OF THE TRUST IS SUBJECT TO INVESTMENT RISK, INCLUDING THE POSSIBLE LOSS OF
THE PRINCIPAL AMOUNT INVESTED.
    
- --------------------------------------------------------------------------------
 
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.
 
- --------------------------------------------------------------------------------
 
   
              SPONSOR                                      TRUSTEE
- -----------------------------------          -----------------------------------
     Dean Witter Reynolds Inc.                    The Chase Manhattan Bank
       2 World Trade Center                            270 Park Avenue
     New York, New York 10048                     New York, New York 10017
                                                  The Chase Manhatten Bank
                                                       270 Park Avenue
                                                  New York, New York 10017
 
    
 
   
                         PROSPECTUS DATED JUNE   , 1998
    
<PAGE>
                        SUMMARY OF ESSENTIAL INFORMATION
 
   
                        DEAN WITTER SELECT EQUITY TRUST
    
   
             MORGAN STANLEY DEAN WITTER REIT PORTFOLIO SERIES 98-1
    
 
   
                             AS OF JUNE   , 1998(1)
    
 
   
<TABLE>
<S>                                                                     <C>
Aggregate Value of Securities in Trust(2).............................  $
Number of Units.......................................................             (3)
Fractional Undivided Interest in the Trust Represented by Each Unit...      1/     th
Public Offering Price Per 100 Units:
    Aggregate Value of Securities in the Trust Divided by [    ] Units
     (times 100 Units)(4).............................................  $
    Public Offering Price per 100 Units(5)............................  $
                                                                        -----------
                                                                        -----------
Sponsor's Repurchase Price per 100 Units and Redemption Price per 100
  Units (based on the value of the underlying Securities, $    less
  than the Public Offering Price per 100 Units)(6)....................  $
</TABLE>
    
 
   
<TABLE>
<S>                                                 <C>
Evaluation Time...................................  Close of the market: 4:00 P.M. New York time.
Record Dates......................................  Monthly on the first day of each month beginning July 1,
                                                    1998.
Distribution Dates................................  Monthly on the fifteenth day of each month beginning July
                                                    15, 1998.
Minimum Principal Distribution....................  No distribution need be made from the Principal Account if
                                                    the balance therein is less than $1.00 per 100 Units
                                                    outstanding.
In-Kind Distribution Date.........................  May [         ], 2002
Liquidation Period................................  Not to exceed 30 business days after the In-kind
                                                    Distribution Date.(7)
Mandatory Termination Date........................  June [         ], 2002
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 the Securities deposited in the Trust.(3)
Trustee's Fee (including estimated expenses)(8)...  $  per 100 Units.
Organizational Expenses (estimated)(9)............  $  per 100 Units.
Sponsor's Portfolio Supervision Fee...............  Maximum of $0.25 per 100 Units.
 
Minimum Purchase: $1,000 ($250 for IRA's)
</TABLE>
    
 
                                       i
<PAGE>
- ------------------------
 
(1) The Initial Date of Deposit. The Indenture was signed and the initial
deposit of Securities with the Trustee was made on the Initial Date of Deposit.
   
(2) Based on the evaluation of the Securities as of 4:00 P.M. on June
[         ], 1998.
    
(3) The number of Units will be increased as the Sponsor deposits additional
Securities into the Trust. See "Introduction", in Part B.
   
(4) Subsequent to the initial offering period (expected to end on June  , 1998)
a sales charge of 4% of the Public Offering Price (4.167% of the net amount
invested in Securities) will be added. The sales charge is reduced on a
graduated basis on purchases of $25,000 or more (see "Public Offering of
Units--Volume Discount").
    
(5) This price is computed as of the Initial Date of Deposit and may vary from
such price on the date of this Prospectus or any subsequent date.
   
(6) This price is computed as of the Initial Date of Deposit and may vary from
such price on the date of this Prospectus or any subsequent date. After the
initial offering period, the repurchase and cash redemption prices will be
further reduced to reflect the Trust's estimated costs of liquidating Securities
to meet the redemption, currently estimated at $  per 100 Units.
    
(7) The final distribution will be made within 5 business days following the
receipt of proceeds from the sale of all Portfolio Securities. (See:
"Administration of the Trust--Termination".)
(8) See: "Expenses and Charges" herein. The fee and the expenses accrue daily
and are payable quarterly. Estimated dividends from the Securities, based on the
last dividends actually paid, are expected by the Sponsor to be sufficient to
pay the estimated expenses of the Trust. In addition to the Trustee's fee,
brokerage costs borne by the Trust in connection with the purchase of Securities
by the Trustee with cash deposited in the Trust are currently estimated at $
per 100 Units.
(9) The cost of preparation and printing of the Indenture, Registration
Statement and other documents relating to the Trust, Federal and State
registration fees and costs, initial fees of the Trustee, and legal and auditing
expenses will be paid by the Trust and, therefore, will be borne by Unit
Holders. These organizational expenses will be amortized over the life of the
Trust. Organizational expenses per Unit have been estimated based on a Trust
with projected total assets of $[  ] million. To the extent the assets of the
Trust are less than such amount, the organizational expense per Unit will be
greater than the estimate shown.
 
                                       ii
<PAGE>
                 SUMMARY OF ESSENTIAL INFORMATION--(continued)
 
                                     FEE TABLE
 
   
THIS FEE TABLE IS INTENDED TO HELP YOU TO UNDERSTAND THE COSTS AND EXPENSES THAT
YOU WILL BEAR DIRECTLY OR INDIRECTLY. SEE PUBLIC OFFERING OF UNITS AND EXPENSES
AND CHARGES. ALTHOUGH THE TRUST HAS A TERM OF APPROXIMATELY FOUR YEARS, AND IS A
UNIT INVESTMENT TRUST RATHER THAN A MUTUAL FUND, THIS INFORMATION IS PRESENTED
TO PERMIT A COMPARISON OF FEES AND EXPENSES (PERCENTAGES ARE BASED ON A $1,000
INVESTMENT IN 100 UNITS).
    
 
   
<TABLE>
<CAPTION>
                                                                                  AMOUNT PER
                                                                                    $1,000
                                                                                  INVESTMENT
UNIT HOLDER TRANSACTION EXPENSES                                                 IN 100 UNITS
- -----------------------------------------------------------------                -------------
<S>                                                                <C>           <C>
Sales Charge Imposed on Purchase (during initial offering
 period).........................................................   -0-          $      -0-(a)
</TABLE>
    
 
   
<TABLE>
<S>                                                                <C>           <C>
ESTIMATED ANNUAL TRUST OPERATING EXPENSES
 (AS A PERCENTAGE OF AVERAGE NET ASSETS)(b)
  Trustee's Fee..................................................      %         $
  Organizational Expenses (c)....................................      %
  Portfolio Supervision, Bookkeeping and Administrative Fees.....      %
  Other Operating Expenses.......................................    --                  --
                                                                   -----             ------
      Total......................................................      %         $
                                                                   -----             ------
                                                                   -----             ------
</TABLE>
    
 
                                    EXAMPLE
 
   
<TABLE>
<CAPTION>
                                                                  CUMULATIVE EXPENSES PAID FOR PERIOD
                                                              -------------------------------------------
                                                                            2           3           4
                                                              1 YEAR      YEARS       YEARS       YEARS
                                                              -------   ---------   ---------   ---------
<S>                                                           <C>       <C>         <C>         <C>
An investor would pay the following expenses on a $1,000
 investment, assuming an estimated operating expense ratio
 of    % and a 5% annual return on the investment
 throughout the periods.....................................  $         $           $           $
 
The Example assumes reinvestment of all dividends and distributions and utilizes a 5% annual rate of
return as mandated by Securities and Exchange Commission regulations applicable to mutual funds. Because
the reductions to the repurchase and cash redemption prices described in footnote 6 on page ii apply only
to the secondary market, these reductions have not been reflected in the figures above. The Example
should not be considered a representation of past or future expenses or annual rate of return; the actual
expenses and rate of return may be more or less than those assumed for purposes of the Example.
</TABLE>
    
 
                              -------------------
 
   
(a)   The secondary market sales charge of 4.00% does not apply to purchases
      during the initial offering period.
    
 
   
(b)  The estimates do not include the costs borne by Unit Holders of purchasing
     and selling Securities.
    
 
   
(c)   The cost of preparation and printing of the Indenture, Registration
      Statement and other documents relating to the Trust. Federal and State
      registration fees and costs, initial fees of the Trustee, and legal and
      auditing expenses will be paid by the Trust and, therefore, will be borne
      by Unit Holders. Organizational expenses per Unit have been estimated
      based on a Trust with projected total assets of $  million. To the extent
      the assets of the Trust are less than such amount, the organizational
      expense per Unit will be greater than the estimate shown.
    
 
                                      iii
<PAGE>
                 SUMMARY OF ESSENTIAL INFORMATION--(continued)
 
   
    THE TRUST--The Dean Witter Select Equity Trust, Morgan Stanley Dean Witter
REIT Portfolio Series 98-1 (the "Trust") is a unit investment trust composed of
a fixed portfolio of publicly-traded common stocks and/or common shares of
beneficial interest issued by publicly traded REITs or contracts to purchase
such stocks (the "Securities"). The objectives of the Trust are primarily
current income and secondarily the potential for long term capital appreciation
by an investment in the Securities (selected as of            , 1998). The
Securities may appreciate or depreciate in value (or pay dividends) depending on
the full range of economic and market influences affecting corporate
profitability, the financial condition of issuers and the prices of equity
securities and securities issued by REITs in general and the Securities in
particular. The value of REITs may be particularly adversely affected in the
event of rising interest rates. Therefore, there is no guarantee that the
objectives of the Trust will be achieved. In this prospectus a reference to
common stock shall include both common stock and common shares of beneficial
interest issued by a REIT organized as a trust.
    
 
    On the Initial Date of Deposit and thereafter, the Sponsor may, under the
Indenture and Agreement, deposit additional Securities, contracts to purchase
additional Securities together with a letter of credit and/or cash (or a letter
of credit in lieu of cash) with instructions to purchase additional Securities
in order to create Additional Units while maintaining to the extent practicable
the proportionate relationship between the number of shares of each Security in
the Portfolio.
 
   
    Unitholders may choose to hold their Units for any length of time up to
approximately four years, depending upon the date of purchase, unless the Trust
is terminated early.
    
 
   
    SPECIAL CHARACTERISTICS OF THE TRUST--SECURITIES SELECTION--The Securities
of the Trust were selected by the Sponsor based upon the research of the Morgan
Stanley Dean Witter (MSDW) Global Equity Research Group's REIT analysts and
based upon the ability of Morgan Stanley & Co. Incorporated to purchase the REIT
shares. MSDW Global Equity Research presently rates stocks in the order of the
highest rating category to the lowest as follows: Strong Buy, Outperform,
Neutral and Underperform. All of the Securities were rated either Strong Buy or
Outperform on the Initial Date of Deposit. The Securities of the Trust consist
of shares of Equity REITs.
    
 
   
    REITs generally have interests in income-producing real estate. There are
two principal types of REITs: those which hold primarily real estate and benefit
from the underlying net rental income generated from the properties ("Equity
REITs") and those which hold primarily mortgages which are secured by real
estate assets and benefit predominantly from the difference between the interest
income on the mortgage loans and the interest expense on the capital used to
finance the loans ("Mortgage REITs"). A third type combines the investment
strategies of the Equity REITs and the Mortgage REITs ("Hybrid REITs"). Equity
REITs emphasize direct property investment, holding their invested assets
primarily in the ownership of real estate or other equity interests. The
objective of an Equity REIT is to purchase income-producing real estate
properties in order to generate cash flow from rental income and a gradual asset
appreciation, and they typically invest in properties such as office, retail,
industrial, hotel, parking facilities, apartment buildings and health care
facilities. To qualify for special tax treatment under the federal income tax
law, a REIT must conform to certain requirements of the Internal Revenue Code of
1986, as amended (the "Code").
    
 
   
    PORTFOLIO ACQUISITION--On the Initial Date of Deposit all of the Securities
deposited in the Trust were acquired by the Sponsor in open market purchases on
the New York Stock Exchange. Subsequent to the Initial Date of Deposit and
during the initial offering period, it is expected that all of the Securities
which the Sponsor deposits in the Trust will have been acquired by the Sponsor
in transactions in which Morgan Stanley & Co. Incorporated, an affiliate of the
Sponsor, will have acted as sole underwriter to the issuers in a public
distribution of the Securities or in a private placement. Morgan Stanley & Co.
Incorporated, in its capacity as underwriter, will acquire the Securities at
prices below the current market value of the Securities due to various factors,
including the size of the purchase, expectation of holding period and cost of
issuance. All of the Securities will be deposited in the Trust based upon their
market value as of the dates of deposit. As a result of the Sponsor's ability to
purchase these Securities below market
    
 
                                       iv
<PAGE>
   
value, the Sponsor will offer Units of the Trust with no sales charge during the
initial offering period. By virtue of buying stock at below market prices, the
Sponsor will realize a profit on the deposit of the Securities to the Trust in
an amount of up to 5% of the market value of these Securities. Notwithstanding
the preceding, the Sponsor may create additional Units by depositing Securities
acquired on the applicable national stock exchanges.
    
 
   
    For additional characteristics of the Trust see Part B.
    
 
   
RISK FACTORS--SPECIAL CONSIDERATIONS--An investment in Units of the Trust should
be made with an understanding
    
   
of the following risks:
    
 
   
    Investors should note that the above criteria were applied to the Securities
selected for inclusion in the Trust Portfolio as of June [ ], 1998. The
portfolio of the Trust is an unmanaged fixed portfolio. Subsequent to June [ ],
1998, the Securities may no longer meet the criteria for initial inclusion in
the Trust and may not be rated Strong Buy or Outperform by MSDW Global Equity
Research. Nevertheless, none of these events will cause the removal of any
Securities from the Trust's fixed portfolio. The Sponsor expects to, on and
subsequent to the Initial Date of Deposit, deposit additional Securities which
reflect the Portfolio as of the Initial Date of Deposit, subject to permitted
adjustments, and/or contracts to purchase additional Securities together with a
letter of credit and/or cash (or a letter of credit in lieu of cash) with
instructions to purchase additional Securities and sell such additional Units
created. The sale of additional Units and the sale of Units in the secondary
market may continue even though the Securities would no longer be chosen for
deposit into the Trust if the selection process were to be made at such later
time and even if a Security were rated "neutral" or "underperform" by MSDW REIT
Research at such time.
    
 
   
    There can be no assurance that the Trust's objectives will be achieved. The
Securities, and hence the Units, may be unsuitable for investors depending on
their specific investment objectives and financial position. The Trust is not
appropriate for investors seeking capital preservation. Past performance is not
a guarantee of future results. The price of, and income from, the Securities
and, therefore, the Units may rise or fall. A Unit Holder's Units, when redeemed
or sold, may be worth more or less than their original cost.
    
 
   
    REIT RISK FACTORS--Many factors can have an adverse impact on the
performance of a particular REIT, its cash available for distribution, the
credit quality of a particular REIT or the real estate industry generally.
Fundamentally, the success of REITs depends on both the appreciation of the
underlying property and the ability to raise rents on those properties. Economic
recession, overbuilding, tax law changes, higher interest rates or excessive
speculation can all have a negative impact on REITs. Risks associated with the
direct ownership of real estate include, among other factors, general and local
economic conditions, decline in real estate values, the financial health of
tenants, overbuilding and increased competition for tenants, oversupply of
properties for sale, changing demographics, changes in interest rates, changes
in government regulations, faulty construction, changes in neighborhood values,
and the unavailability of construction financing or mortgage loans at rates
acceptable to developers. Variations in rental income and space availability and
vacancy rates in terms of supply and demand are additional factors affecting
real estate generally and REITs in particular. Investors should also be aware
that REITs may not be diversified and are subject to the risks of financing
projects. The real estate industry may be cyclical and, to the extent the Trust
acquires REIT Securities at or near the top of the cycle, there is increased
risk of a decline in value of the REIT Securities during the life of the Trust.
The recent increased demand for certain types of real estate may have inflated
the value of real estate thereby increasing the risk of a substantial decline in
the value of such real estate and increasing the risk of a decline in the value
of the Securities and therefore the value of the Units. REITs are also subject
to defaults by borrowers and the market's perception of the REIT industry
generally.
    
 
   
    Certain REITs in the Trust may be structured as UPREITs. This form of REIT
owns an interest in a partnership that owns real estate, which can result in a
potential conflict of interest between shareholders of the REIT who may want to
sell an asset and other partnership interest holders who would be subject to tax
liability if the REIT sells the property. In some cases, REITs have entered
    
 
                                       v
<PAGE>
   
into "no sell" agreements, which are designed to avoid a taxable event to the
holders of partnership units by preventing the REIT from selling the property.
This arrangement may mean that the REIT would refuse a lucrative offer for an
asset or be forced to hold on to a poor asset. Since "no sell" agreements are
often undisclosed, the Sponsor is unable to state whether any of the REITs in
the Trust have entered into this kind of arrangement.
    
 
   
    REIT Taxation. Each of the REITs in which the Trust invests will generally
state its intention to operate in such manner as to qualify for taxation as a
"real estate investment trust" under the Code, although, of course, no assurance
can be given that each REIT will at all times so qualify. So long as an issuer
qualifies as a REIT, it will, in general, be subject to Federal income tax only
on income that is not distributed to stockholders. In order to qualify as a REIT
for any taxable year, a REIT must, among other things, hold at least 75% of its
assets in real estate, cash items and government securities; derive at least 75%
of its gross income from rent from real property and interest on mortgages;
derive at least 95% of its gross income from sources that satisfy the 75% gross
income test described in the preceding clause, plus dividends, interest and gain
from the sale or disposition of certain stock or securities; and distribute to
its stockholders annually an amount at least equal to 95% of its REIT taxable
income (computed without regard to net capital gain or the dividends paid
deduction). Failure to qualify for taxation as a REIT in any taxable year will
subject an issuer to tax on its taxable income at regular corporate rates and
certain other taxes. Distributions to stockholders in any year in which an
issuer fails to qualify as a REIT will not be deductible by the issuer. Unless
entitled to relief under specific statutory provisions, the issuer would not
qualify for taxation as a REIT for the next four taxable years after failing to
qualify in any year. Each REIT may also be subject to state, local or other
taxation in various state, local or other jurisdictions. A change in the tax
laws or regulations relating to REIT's may adversely affect the value of the
Securities. The Administration recently issued a budget proposal which contained
provisions which, if enacted, may adversely affect REITs. Such proposals include
new limits on the ownership by REITs of stock in other entities, new limits on
ownership of a REIT and limits on the ability of certain REITs to acquire
additional properties.
    
 
   
    LEGISLATIVE RISK--At any time there may exist proposals by lawmakers to pass
legislation that could adversely affect REIT's including proposals relating to
environmental, fire, safety and tax laws and regulations. The Sponsor cannot
predict whether new laws that affect REITS will be enacted.
    
 
   
    For additional REIT related risks see "Part B--Risk Factors--Special
Considerations".
    
 
   
    There are risks inherent in an investment in common stocks, which comprise
the portfolio of the Trust, including risks associated with the limited rights
of holders of common stock to receive payments from issuers of such stock; such
rights are inferior to those of creditors and holders of debt obligations or
preferred stock. Also, holders of common stock have the right to receive
dividends only when, as and if such dividends are declared by the issuer's board
of directors. Investors should also be aware that the value of the underlying
Securities in the Portfolio may fluctuate in accordance with changes in the
value of common stocks in general. Equity markets have been at historically high
levels and no assurance can be given that these levels will continue. There are
certain risks of price volatility associated with investment in common stocks,
including REIT stocks. Your risk is increased because your capital is
concentrated in stocks from one industry. The value of the common stock in the
Trust may be expected to fluctuate over the life of the Trust to values higher
or lower than those prevailing on a date of deposit. The value of a Unit may be
subject to greater volatility than an investment in a more diversified portfolio
both in terms of the number of issuers and the concentration in issues from one
industry.
    
 
   
    The value of the Units will fluctuate depending on all the factors that have
an impact on the economy and the equity markets. These factors similarly impact
on the ability of an issuer to pay dividends. The Trust is not a "managed"
registered investment company and Securities will not be sold by the Trustee as
a result of ordinary market fluctuations.
    
 
    In connection with the deposit by the Sponsor of cash (or a letter of credit
in lieu of cash) with instructions to purchase additional Securities in order to
create Additional Units, to the extent that the price of a Security fluctuates
between the time the cash
 
                                       vi
<PAGE>
is deposited and the time the cash is used to purchase the Security, Units
(including previously issued Units) may represent more or less of that Security
and more or less of other Securities in the Portfolio of the Trust. In addition,
the brokerage fees incurred in purchasing Securities with such deposited cash
will be borne by the Trust. Any Unit Holder who purchased Units prior to the
purchase of Securities with such deposited cash would experience dilution as a
result of any such brokerage fees.
 
   
    DISTRIBUTION--The Trustee will distribute any dividends (net of Trust
expenses) and any proceeds from the disposition of Securities not used for
redemption of Units received by the Trust on the monthly Distribution Dates to
holders of record on the Record Date immediately preceeding each monthly
Distribution Date. Upon termination of the Trust, the Trustee will distribute to
each Unit Holder of record its pro rata share of the Trust's assets, less
expenses then payable or Unit Holders can elect to reinvest their distributions
automatically in units of a New Series (as defined below), if offered by the
Sponsor, (see "Administration of the Trust--Termination"). The sale of
Securities in the Trust during the period prior to termination and upon
termination may result in a lower amount than might otherwise be realized if
such sale were not required at such time due to impending or actual termination
of the Trust. For this reason, among others, the amount realized by a Unit
Holder upon termination may be less than the amount paid by such Unit Holder.
(See: "Administration of the Trust--Distribution".)
    
 
    The Sponsor anticipates that, based upon the last dividends actually paid by
the companies listed in the "Schedule of Portfolio Securities", dividends from
the Securities will be sufficient to (i) pay expenses of the Trust and (ii)
after such payment, to make distributions to Unit Holders as described herein.
(See: "Expenses and Charges" and "Administration of the Trust-- Distribution".)
 
   
    PUBLIC OFFERING PRICE--The Public Offering Price per 100 Units is computed
on the basis of the aggregate value of the underlying Securities next computed
after receipt of a purchase order plus cash on hand in the Trust, divided by the
number of Units outstanding times 100. After the initial offering period the
Units will be offered at a Public Offering Price determined by aggregating the
value of Securities, reduced by Trust liabilities, and by adding a sales charge
of 4.167% of such evaluation per 100 Units (the amount invested in Securities);
this results in a sales charge of 4.00% of the Public Offering Price. A
proportionate share of amounts, if any, in the Income Account is also added to
the Public Offering Price. (See "Public Offering of Units--Public Offering
Price".) The sales charge will be reduced on a graduated basis on purchases of
$25,000 or more.
    
 
   
    MARKET FOR UNITS--The Sponsor, though not obligated to do so, intends to
maintain a market for the Units. 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 value of the underlying Securities. (See: "Redemption".) Market
conditions may cause such prices to be greater or less than the amount paid for
Units.
    
 
   
    TERMINATION--The Trust will terminate approximately four years after the
Initial Date of Deposit regardless of market conditions at that time. The Trust
will then liquidate. Unit Holders may elect to receive shares in-kind. Prior to
termination of the Trust, the Trustee will begin to sell the Securities held in
the Trust over a period not to exceed 30 consecutive business days (the
"Liquidation Period"). Monies held upon such sale of Securities will be held
uninvested in non-interest bearing accounts created by the Indenture until
distributed pro rata to Unit Holders on or about June [ ], 2002 and will be of
benefit to the Trustee during such period. During the life of the Trust,
Securities will not be sold to take advantage of market fluctuations.
    
 
    Because the Trust is not managed and the Securities can only be sold during
the Liquidation Period or under certain other limited circumstances described
herein, the proceeds received from the sale of Securities may be less than could
be obtained if the sale had taken place at a different time. Depending on the
volume of Securities sold and the prices of and demand for Securities at the
time of such sale, the sales of Securities from the Trust may tend to depress
the market prices of such Securities and hence the value of the Units, thus
reducing termination proceeds available to Unit Holders. In order to mitigate
potential adverse price consequences of heavy volume trading in the Securities
taking place over a short period of time and to provide an average market price
for the Securities, the Trustee will follow procedures set forth in the
Indenture to sell the Securities in an orderly fashion over a
 
                                      vii
<PAGE>
period not to exceed the Liquidation Period. The Sponsor can give no assurance,
however, that such procedures will mitigate negative price consequences or
provide a better price for such Securities. The Trust may terminate earlier than
on the Mandatory Termination Date if the value of the Trust is less than the
Discretionary Liquidation Amount set forth under "Administration of the
Trust--Termination."
 
   
    PORTFOLIO CHARACTERISTICS--A review of the Trust's Securities as of the
Initial Date of Deposit indicates that all are Equity REITs and can be
characterized as being within the following categories set forth below:
    
 
   
<TABLE>
<CAPTION>
                                                                                                   APPROXIMATE
                                                                                                    PERCENTAGE
                                                                                               OF AGGREGATE MARKET
CATEGORY OF ISSUER                                                              PORTFOLIO NO.     VALUE OF TRUST
- ------------------------------------------------------------------------------  -------------  --------------------
<S>                                                                             <C>            <C>
Hotel.........................................................................
Industrial....................................................................
Manufactured housing..........................................................
Multifamily...................................................................
Office........................................................................
Regional mall.................................................................
Self storage..................................................................
Shopping mall.................................................................
</TABLE>
    
 
                                      viii
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
THE UNIT HOLDERS, SPONSOR AND TRUSTEE
   
DEAN WITTER SELECT EQUITY TRUST
MORGAN STANLEY DEAN WITTER REIT PORTFOLIO SERIES 98-1
    
 
   
    We have audited the accompanying statement of financial condition and
schedule of portfolio securities of the Dean Witter Select Equity Trust Morgan
Stanley Dean Witter REIT Portfolio Series 98-1 as of June  , 1998. These
financial statements are the responsibility of the Trustee. (See note (e) to the
Statement of Financial Condition). 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 an 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 June  , 1998, by correspondence with The Chase
Manhattan Bank, 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 Equity Trust Morgan Stanley
Dean Witter REIT Portfolio Series 98-1 as of June  , 1998 in conformity with
generally accepted accounting principles.
    
 
   
DELOITTE & TOUCHE LLP
June  , 1998
New York, New York
    
 
                                       ix
<PAGE>
                        STATEMENT OF FINANCIAL CONDITION
 
                        DEAN WITTER SELECT EQUITY TRUST
   
             MORGAN STANLEY DEAN WITTER REIT PORTFOLIO SERIES 98-1
    
                 INITIAL DATE OF DEPOSIT,               , 1998
 
   
<TABLE>
<S>                                                           <C>
TRUST PROPERTY
    Sponsor's Contracts to purchase underlying Securities
     backed by an irrevocable letter of credit (a)..........  $
    Organizational costs (b)................................
                                                              -----------
      Total.................................................  $
                                                              -----------
                                                              -----------
LIABILITY AND INTEREST OF UNIT HOLDERS
    Liability--
      Accrued liability (b).................................  $
                                                              -----------
      Subtotal..............................................
                                                              -----------
    Interest of Unit Holders--
    Units of fractional undivided interest outstanding:
      Cost to investors (c).................................  $
      Gross underwriting commissions (d)....................
                                                              -----------
    Net amount applicable to investors......................  $
                                                              -----------
      Total.................................................  $
                                                              -----------
                                                              -----------
</TABLE>
    
 
                                       x
<PAGE>
- ------------------------
   
(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 Trustee on the basis set forth
    under "Public Offering of Units--Public Offering Price" as of the Initial
    Date of Deposit. An irrevocable letter of credit drawn on [           ] in
    the amount of $300,000.00 has been deposited with the Trustee.
    
 
   
(b) Organizational costs borne by the Trust have been deferred and will be
    amortized over the life of the Trust. Organizational costs have been
    estimated based on a Trust with projected total assets of $  million. To the
    extent the assets of the Trust are less than $  million, the organizational
    costs may be less although the per Unit amount may increase. To the extent
    the assets of the Trust are more, the organizational costs may be higher.
    
 
   
(c) The Public Offering Price is computed on the basis set forth under "Public
    Offering of Units--Public Offering Price".
    
 
   
(d) There is no sales charge during the Initial Offering Period. See "Summary of
    Essential Information" for additional information.
    
 
   
(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
    controls 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 Trustee determines the price for each
    underlying Security included in the Trust's Schedule of Portfolio Securities
    on the basis set forth in "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.
    
 
                                       xi
<PAGE>
   
                        SCHEDULE OF PORTFOLIO SECURITIES
 
                        DEAN WITTER SELECT EQUITY TRUST
                   MORGAN STANLEY REIT PORTFOLIO SERIES 98-1
                ON INITIAL DATE OF DEPOSIT,               , 1998
    
 
   
<TABLE>
<CAPTION>
                                                     CURRENT
                                                     ANNUAL                     PERCENTAGE
                                                    DIVIDEND                   OF AGGREGATE                         COST OF
                                                       PER       NUMBER OF     MARKET VALUE   PRICE PER SHARE     SECURITIES
   NO.      NAME OF ISSUER                          SHARE (1)      SHARES        OF TRUST        TO TRUST       TO TRUST (2)(3)
- ---------   --------------------------------------  ---------   ------------   ------------   ---------------   ---------------
<C>         <S>                                     <C>         <C>            <C>            <C>               <C>
</TABLE>
    
 
- ------------------------
   
                     (4)
(1) Based on the latest quarterly or semiannual declaration. There can be no
    assurance that future dividend payments, if any, will be maintained in an
    amount equal to the dividend listed above.
    
 
   
(2) All Securities are represented entirely by contracts to purchase entered
    into on June [ ], 1998. Valuation of Securities by the Trustee was made on
    the basis of the closing sale price on the exchange where the Security is
    listed, or on the asked price if not listed on an exchange, on June [ ],
    1998. The aggregate purchase price to the Sponsor for the Securities
    deposited in the Trust is $        .
    
 
   
(3) The Sponsor had no profit or loss on the Initial Date of Deposit.
    
 
   
(4) This Security is a restricted security and is subject to limitations on
    resale. See "The Trust--Risk Factors--Special Considerations--Liquidity."
    
 
                                      xii
<PAGE>
    The Sponsor or affiliates thereof may perform or seek to perform investment
banking services for, and may have acted as an underwriter, manager or
co-manager of a public offering of the securities of, the above issuers during
the last three years. The Sponsor or affiliates may serve as specialists in the
Securities in this Trust on one or more stock exchanges, or markets, may make
markets in or may have a long or short position in or effect transactions in any
of these stocks or in options on any of these stocks, and may be on the opposite
side of public orders executed on the floor of an exchange where the Securities
are listed. An officer, director or employee of the Sponsor or affiliates may be
an officer or director of one or more of the issuers of the Securities in the
Trust. The Sponsor or affiliates may trade for its own account as an odd-lot
dealer, market maker, block positioner and/or arbitrageur in any of the
Securities or options relating thereto. The Sponsor, its affiliates, directors,
elected officers, employees and employee benefits programs may have either a
long or short position in any Security or option relating thereto.
 
                                      xiii
<PAGE>
                               PROSPECTUS PART B
 
                        DEAN WITTER SELECT EQUITY TRUST
 
                                  INTRODUCTION
 
   
    This series of the Dean Witter Select Equity Trust (the "Trust") was created
under the laws of the State of New York pursuant to a Trust Indenture and
Agreement (the "Indenture") and a related Reference Trust Agreement (the
"Agreement") (collectively, the "Indenture and Agreement")*, between Dean Witter
Reynolds Inc. (the "Sponsor") and The Chase Manhattan Bank (the "Trustee"). The
Sponsor is a principal operating subsidiary of Morgan Stanley Dean Witter & Co.,
a publicly-held corporation. (See: "Sponsor".) The objectives of the Trust are
primarily current income and secondarily the potential for long term capital
appreciation through investment in a fixed portfolio of Securities (the
"Portfolio") of publicly-traded common stock. There is no assurance that these
objectives will be met because the Securities may appreciate or depreciate in
value depending on the full range of economic and market influences affecting
corporate profitability, the financial condition of issuers and the prices of
equity securities in general and the Securities in particular.
    
 
    On the date of creation of the Trust (the "Initial Date of Deposit"), the
Sponsor deposited with the Trustee certain securities and contracts and funds
(represented by irrevocable letter(s) of credit issued by major commercial
bank(s)) for the purchase of such securities (collectively, the "Securities") at
prices equal to the market value of such Securities as determined by the Trustee
as of the Initial Date of Deposit and/or cash (or a letter of credit in lieu of
cash) with instructions to the Trustee to purchase such Securities. (See:
"Schedule of Portfolio Securities".) The Trust was created simultaneously with
the deposit of the Securities with the Trustee and the execution of the
Indenture and the Agreement. The Trustee then immediately recorded the Sponsor
as owner of the units (the "Units") comprising the entire ownership of the
Trust.
 
    Through this prospectus (the "Prospectus"), the Sponsor is offering the
Units, including Additional Units, as defined below, for sale to the public. The
holders of Units (the "Unit Holders") will have the right to have their Units
redeemed at a price based on the market value of the Securities (the "Redemption
Value") 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. The Trustee has not participated in the selection of Securities for
the Trust, and neither the Sponsor nor the Trustee will be liable in any way for
any default, failure or defect in any Securities.
 
    With the deposit of the Securities in the Trust on the Initial Date of
Deposit, the Sponsor established a proportionate relationship between the number
of shares of each Security in the Portfolio. (The original proportionate
relationships on the Initial Date of Deposit are set forth in "Schedule of
Portfolio Securities".) The original proportionate relationships are subject to
adjustment under certain limited circumstances. (See: "Administration of the
Trust--Portfolio Supervision".) The Sponsor is permitted under the Indenture and
Agreement to deposit additional Securities, contracts to purchase additional
Securities together with a letter of credit and/or cash (or a letter of credit
in lieu of cash) with instructions to the Trustee to purchase additional
Securities in order to create additional Units ("Additional Units"). Any such
additional deposits made in the 90 day period following the creation of the
Trust will consist of securities identical to those already in the Trust and
will be in amounts which maintain, to the extent practicable, the original
proportionate relationship between the number of shares of each Security and any
cash in the Portfolio. It may not be possible to maintain the exact original
proportionate relationship because of price changes or other reasons.
 
- ------------------------
* Reference is hereby made to said Indenture and Agreement and any statements
  contained herein are qualified in their entirety by the provisions of said
  Indenture and Agreement.
<PAGE>
    Any cash deposited with instructions to purchase Securities may be held in
an interest bearing account by the Trustee. Any interest earned on such cash
will be the property of the Trust. Any cash deposited with instruction to
purchase Securities not used to purchase Securities and any interest not used to
pay Trust expenses will be distributed to Unit Holders on the earlier of the
first Distribution Date or 90 days after the Initial Date of Deposit. Additional
Units may be continuously offered for sale to the public by means of this
Prospectus. Subsequent to the 90 day period following the Initial Date of
Deposit any deposit of additional Securities and cash must exactly replicate the
portfolio immediately prior to such deposit.
 
    The Sponsor may acquire large volumes of additional Securities for deposit
into the Trust over a short period of time. Such acquisitions may tend to raise
the market prices of these Securities. To minimize the risk of price
fluctuations when purchasing Securities, the Trust may purchase Securities at
the closing price as of the Evaluation Time by entering into trades with
unaffiliated broker/dealers for the purchase of large quantities of shares. Such
trades will be entered into at an increased commission cost which will be borne
by the Trust. (See "Summary of Essential Information"). The Sponsor cannot
currently predict the actual market impact of the Sponsor's purchases of
additional Securities, because the actual volume of Securities to be purchased
and the supply and price of such Securities is not known.
 
    Units will be sold to investors at the Public Offering Price next computed
after receipt of the investor's order to purchase Units, if Units are available
to fill orders on the day that that price is set. If Units are not available or
are insufficient to fill the order, the investor's order will be rejected by the
Sponsor. The number of Units available may be insufficient to meet demand
because of the Sponsor's inability to or decision not to purchase and deposit
underlying Securities in amounts sufficient to maintain the proportionate
numbers of shares of each Security as required to create additional Units. The
Sponsor may, if unable to accept orders on any given day, offer to execute the
order as soon as sufficient Units can be created. An investor who agrees to this
will be deemed to place a new order for that number of Units each day until that
order is accepted. The investor's order will then be executed, when Units are
available, at the Public Offering Price next calculated after such continuing
order is accepted. The investor will, of course, be able to revoke his purchase
offer at any time prior to acceptance by the Sponsor. The Sponsor will execute
orders to purchase in the order it determines that they are received, i.e.,
orders received first will be filled first, except that indications of interest
prior to the effectiveness of the registration of the offering of Trust Units
which become orders upon effectiveness will be accepted according to the order
in which the indications of interest were received.
 
    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". Thereafter, if any Units are redeemed, the
amount of Securities in the Trust will be reduced, and the fractional undivided
interest represented by each remaining Unit in the balance of the Trust will be
increased. However, if Additional Units are issued by the Trust, the aggregate
value of the Securities in the Trust will be increased by amounts allocable to
such Additional Units and the fractional undivided interest in the balance will
be decreased. In connection with the deposit by the Sponsor of cash (or a letter
of credit in lieu of cash) with instructions to purchase additional Securities
in order to create Additional Units, to the extent that the price of a Security
fluctuates between the time the cash is deposited and the time the cash is used
to purchase the Security, Units (including previously issued Units) may
represent more or less of that Security and more or less of other Securities in
the Portfolio of the Trust. 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 and Agreement.
 
                                       2
<PAGE>
                                   THE TRUST
 
OBJECTIVE AND SECURITIES SELECTION
 
   
    The objectives of the Trust are primarily current income and secondarily the
potential for long term capital appreciation through an investment in a fixed
diversified portfolio of Securities chosen in the manner described in the
"Summary of Essential Information" in Part A herein. There is, of course, no
guarantee that the Trust's objectives will be achieved. The Trust has an
expected life of approximately four years.
    
 
   
    The Trust consists of such of the Securities listed under "Schedule of
Portfolio Securities" as may continue to be held from time to time in the Trust
and any additional Securities and/or contributed cash acquired and held by the
Trust pursuant to the provisions of the Indenture together with undistributed
income therefrom and undistributed cash realized from the disposition of
Securities (See: "Administration of the Trust"). Neither the Sponsor nor the
Trustee shall be liable in any way for any default, failure or defect in any of
the Securities. However, should any contract deposited hereunder fail and no
substitute Security be acquired, the Sponsor shall cause to be refunded the cost
of the failed contract listed under "Schedule of Portfolio Securities".
    
 
    Because certain Securities from time to time may be sold or their percentage
reduced under certain circumstances described herein, and because additional
Securities are expected to 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
exact composition. (See: "Administration of the Trust--Portfolio Supervision".)
 
    The Trust is organized as a unit investment trust and not as a management
investment company. Therefore, neither the Trustee nor the Sponsor has the
authority to manage the Trust's assets in an attempt to take advantage of
various market conditions to improve the Trust's net asset value, and further,
the Trust's Securities may be disposed of only under limited circumstances.
(See: "Administration of the Trust--Portfolio Supervision".)
 
    There is no assurance that any dividends will be declared or paid in the
future on the Securities initially deposited or to be deposited subsequently in
the Trust.
 
   
    The Sponsor may deposit additional Securities and may continue to sell Units
of the Trust even though one or more of the Securities is no longer rated Strong
Buy or Outperform by MSDW Global Equity Research on the date of deposit of the
additional Securities or sale of the Units.
    
 
SUMMARY DESCRIPTION OF THE PORTFOLIO
 
   
    As used herein, the term "Common Stocks" refers to the common stocks and
common shares of beneficial interest (or contracts to purchase such common
stocks and common interests) (any such contracts to purchase common stocks to be
accompanied by an irrevocable letter of credit sufficient to perform such
contracts), initially deposited in the Trust and described under "Schedule of
Portfolio Securities". The term "Securities" includes any additional common
stock or contracts to purchase additional common stock together with the
corresponding irrevocable letter of credit, subsequently acquired by the Trust
pursuant to the Indenture and Agreement.
    
 
   
    The Portfolio is comprised of REITs that the Sponsor believes offer an
opportunity for current income and the potential for long term capital
appreciation over the life of the Trust. Investors should carefully review the
Portfolio and the objectives of the Trust and consider their ability to assume
the risks involved before investing in the Trust.
    
 
   
    REITs are structured as either corporations or business trusts. REITs will
not be subject to corporate income taxes provided the REIT satisfies the
applicable requirements of the Internal Revenue Code. The major tests for the
tax-qualified status are that the REIT (i) be managed by one or more trustees or
directors, (ii) issue shares of transferable interest to its owners, (iii) have
at least
    
 
                                       3
<PAGE>
   
100 shareholders, (iv) during the last half of each taxable year have no more
than 50% of the shares held by five or fewer individuals, (v) invest
substantially all of its capital in real estate assets and derive substantially
all of its gross income from real estate related assets and (vi) distribute at
least 95% of its taxable income (without regard to any net capital gains) to its
shareholders each year.
    
 
   
    The Securities deposited in the Trust on the Initial Date of Deposit consist
entirely of interests in REITs as set forth in Part A. There are two principal
types of REITs: Equity REITs which typically hold primarily real estate and
benefit from the underlying net rental income generated from the properties, and
Mortgage REITs, which typically hold primarily mortgages which are secured by
real estate assets and benefit predominantly from the difference between the
interest income on the mortgage loans and the interest expense on the capital
used to finance the loans. A third type, Hybrid REITs, combines the investment
strategies of the Equity REITs and the Mortgage REITs.
    
 
   
    In addition to being classified according to investment type, REITS may be
categorized further in terms of their specialization by property type (e.g.,
retail, multifamily, industrial, office, etc.,) or geographic focus (nationwide,
regional or metropolitan area). Additional stratification is then possible
within certain product types (e.g., factory outlets, community centers, and
regional malls are all categories within the retail sector).
    
 
RISK FACTORS--SPECIAL CONSIDERATIONS
 
   
    Investment in the Trust should be made with an understanding that the value
of the underlying Securities, and therefore the value of the Units, will
fluctuate, depending on the full range of economic and market influences which
may affect the market value of the Securities, including the profitability and
financial condition of issuers, conditions in the real estate industry, market
conditions and values of common stocks generally, and other factors. The Trust
is not appropriate for investors requiring conservation of capital.
    
 
   
    The Sponsor's buying and selling of the Securities, especially during the
initial offering of Units of the Trust or to satisfy redemptions of Units may
impact upon the value of the underlying Securities and the Units. The
publication of the list of the Securities selected for the Trust may also cause
increased buying activity in certain of the REITs comprising the Portfolio.
After such announcement, investment advisory and brokerage clients of the
Sponsor and its affiliates may purchase individual Securities appearing on the
list during the course of the initial offering period. Such buying activity in
the stock of these REITs prior to the purchase of the Securities by the Trust
may cause the Trust to purchase the REITs at a higher price than those buyers
who purchase REIT shares prior to the purchases by the Trust and may also
increase the amount of the profit realized by the Sponsor on the purchase of the
Securities from their issuers. In addition, the issuances of the additional
Securities by the REITs in the transactions underwritten by the Sponsor may, in
certain circumstances, have an adverse impact on the value of the Securities and
the Units.
    
 
   
    A substantial amount of the shares of a REIT may be owned by the Trust
and/or other unit investment trusts. The sale proceeds of Securities during the
life of the Trust and particularly at the termination of the Trust may be
adversely affected as a result of the disposition of REIT shares by such other
unit investment trusts.
    
 
   
    Since the Trust will consist entirely of shares issued by REITs, a domestic
corporation or business trust which invests primarily in income producing real
estate or real estate related loans or mortgages, an investment in the Trust
will be subject to risks similar to those associated with the direct ownership
of real estate (in addition to securities markets risks) because of its policy
of concentration in the securities of companies in the real estate industry.
These include declines in the value of real estate, illiquidity of real property
investments, risks related to general and local economic conditions, dependency
on management skill, heavy cash flow dependency, possible lack of availability
of mortgage funds, excessive levels of debt or overleveraged financial
structure, overbuilding, extended vacancies of properties, increase in
competition, increases in property taxes and operating expenses, changes in
zoning laws, losses due to costs resulting from the clean-up of environmental
problems, liability to third parties for
    
 
                                       4
<PAGE>
   
damages resulting from environmental problems, casualty or condemnation losses,
economic or regulatory impediments to raising rents, changes in neighborhood
values and the appeal of properties to tenants and changes in interest rates. In
addition to these risks, Equity REITs may be more likely to be affected by
changes in the value of the underlying property owned by the trusts. Further,
REITs are dependent upon the management skills of the issuers and generally may
not be diversified. REITs are also subject to heavy cash flow dependency,
defaults by borrowers and self-liquidation. The above factors may also adversely
affect a borrower's or a lessee's ability to meet its obligations to the REIT.
In the event of a default by a borrower or lessee, the REIT may experience
delays in enforcing its rights as a mortgagee or lessor and may incur
substantial costs associated with protecting its investments.
    
 
   
    Real estate investment trusts are financial vehicles that have as their
objective the pooling of capital from a number of investors in order to
participate directly in real estate ownership or financing. REITs may be
self-managed or managed by separate advisory companies for a fee which is
ordinarily based on a percentage of the assets of the REIT in addition to
reimbursement of operating expenses. Since the Trust will consist entirely of
shares issued by REITs, an investment in the Trust will be subject to varying
degrees of risk generally incident to the ownership of real property (in
addition to securities market risks) and will involve more risk than a portfolio
of common stocks that is not concentrated in a particular industry or group of
industries.* The underlying value of the Trust's Securities and the Trust's
ability to make distributions to its Unit Holders may be adversely affected by
adverse changes in national economic conditions, adverse changes in local market
conditions due to changes in general or local economic conditions and
neighborhood characteristics, increased competition from other properties,
obsolescence of property, changes in the availability, cost and terms of
mortgage funds, the impact of present or future environmental legislation and
compliance with environmental laws, the ongoing need for capital improvements,
particularly in older properties, changes in real estate tax rates and other
operating expenses, regulatory and economic impediments to raising rents,
adverse changes in governmental rules and fiscal policies, dependency on
management skills, civil unrest, acts of God, including earthquakes and other
natural disasters (which may result in uninsured losses), acts of war, adverse
changes in zoning laws, and other factors which are beyond the control of the
issuers of the REITs in the Trust. The value of the REITs may at times be
particularly sensitive to devaluation in the event of rising interest rates.
    
 
   
    A significant amount of the assets of a REIT may be invested in investments
in specific geographic areas or in specific property types, I.E., hotels,
shopping malls, residential complexes, and office buildings; the impact of
economic conditions on REITs can also be expected to vary with geographic
location and property type. Variations in rental income and space availability
and vacancy rates in terms of supply and demand are additional factors affecting
real estate generally and REITs in particular. In addition, investors should be
aware that REITs may not be diversified and are subject to the risks of
financing projects. REITs are also subject to defaults by borrowers, the
market's perception of the REIT industry generally, and the possibility of
failing to qualify for tax-free pass-through of income under the Internal
Revenue Code, and to maintain exemption from the Investment Company Act of 1940.
A default by a borrower or lessee may cause the REIT to experience delays in
enforcing its rights as mortgagee or lessor and to incur significant costs
related to protecting its investments.
    
 
   
    UNINSURED LOSSES. The issuer of REITs generally maintains comprehensive
insurance on presently owned and subsequently acquired real property assets,
including liability, fire and extended coverage. However, there are certain
types of losses, generally of a catastrophic nature, such as earthquakes and
floods, that may be uninsurable or not economically insurable, as to which the
REITs properties are at risk in their particular locales. The management of REIT
issuers use their discretion in determining amounts, coverage limits and
deductibility provisions of insurance, with a view to requiring appropriate
insurance on their investments at a reasonable costs and on suitable terms. This
may result in insurance coverage that in the event of a substantial loss would
not be sufficient to pay the full current market value or current replacement
cost of the lost investment. Inflation, changes in building codes
 
- ------------------------
    
   
* A Trust is considered to be "concentrated" in a particular industry when the
  Securities in that industry constitute 25% or more of the total asset value of
  the portfolio.
    
 
                                       5
<PAGE>
   
and ordinances, environmental considerations, and other factors also might make
it unfeasible to use insurance proceeds to replace a facility after it has been
damaged or destroyed. Under such circumstances, the insurance proceeds received
by REITs might not be adequate to restore its economic position with respect to
such property.
    
 
   
    ENVIRONMENTAL LIABILITY. Under various federal, state, and local
environmental laws, ordinances and regulations, a current or previous owner or
operator of real property may be liable for the costs of removal or remediation
of hazardous or toxic substances on, under or in such property. Such laws often
impose liability whether or not the owner or operator caused or knew of the
presence of such hazardous or toxic substances and whether or not the storage of
such substances was in violation of a tenant's lease. In addition, the presence
of hazardous or toxic substances, or the failure to remediate such property
properly, may adversely affect the owner's ability to borrow using such real
property as collateral. No assurance can be given that one or more of the REITs
in the Trust may not be presently liable or potentially liable for any such
costs in connection with real estate assets they presently own or subsequently
acquire while such REITs shares are held in the Trust.
    
 
   
    AMERICANS WITH DISABILITIES ACT. Under the Americans with Disabilities Act
of 1990 (the "ADA"), all public accommodations are required to meet certain
federal requirements related to physical access and use by disabled persons. In
the event that any of the REITs in the Trust invest in or hold mortgages in real
estate properties subject to the ADA, a determinaton that any such properties
are not in compliance with the ADA could result in imposition of fines or an
award of damages to private litigants. If any of the REITs in the Trust were
required to make modifications to comply with the ADA, the REIT's ability to
make expected distributions to the Trust could be adversely affected, thus
adversely affecting the ability of the Trust to make distributions to Unit
Holders.
    
 
   
    PROPERTY TAXES. Real estate generally is subject to real property taxes. The
real property taxes on the properties underlying the REITs in the Trust may
increase or decrease as property tax rates change and as the properties are
assessed or reassessed by taxing authorities. An increase in real estate taxes
may adversely affect the value of the Securities.
    
 
   
    See "Part A--REIT Risk Factors" for additional risks relating to REITs.
    
 
   
    An investment in Units of the Trust should be made with an understanding of
the risks which an investment in publicly-traded common stock may entail,
including the risk that the value of the Portfolio and hence of the Units will
decline with decreases in the market value of the Securities. The Trust will be
terminated and liquidated no later than the Mandatory Termination Date set forth
in the "Summary of Essential Information".
    
 
    The value of the underlying Securities, and therefore the value of Units,
will fluctuate, and can decline, depending upon the full range of economic and
market influences which may affect the market value of such Securities. Certain
risks are inherent in an investment in equity securities, including the risk
that the financial condition of one or more of the issuers of the Securities may
worsen or the general condition of the common stock market may weaken. In such
case, the value of the Portfolio Securities and hence the value of Units may
decline.
 
   
    Common stocks are susceptible to general stock market movements and to
volatile and unpredictable increases and decreases in value as market confidence
in and perceptions of the issuers change from time to time. Such perceptions are
based upon varying reactions to such factors as expectations regarding domestic
and foreign economic, monetary and fiscal policies, inflation and interest
rates, currency exchange rates, economic expansion or contraction, and global or
regional political, economic or banking crises. The Sponsor cannot predict the
direction or scope of any of these factors. Additionally, equity markets have
been at historically high levels and no assurance can be given that these levels
will continue. THE TRUST HOLDS STOCKS THAT MAY BE SUBJECT TO ABOVE-AVERAGE PRICE
VOLATILITY. THEREFORE THERE CAN BE NO ASSURANCE THAT THE TRUST WILL BE EFFECTIVE
IN ACHIEVING ITS OBJECTIVE OVER ITS FOUR-YEAR LIFE OR THAT FUTURE PORTFOLIOS
SELECTED USING THE SAME METHODOLOGY AS THE TRUST, IF ANY, DURING CONSECUTIVE
FOUR-YEAR OR OTHER PERIODS WILL MEET THEIR OBJECTIVES. THE TRUST IS NOT DESIGNED
TO BE A COMPLETE INVESTMENT PROGRAM.
    
 
                                       6
<PAGE>
    There are certain payment risks involved in owning common stocks, including
risks arising from the fact that holders of common and preferred stocks have
rights to receive payments from the issuers of those stocks that are generally
inferior to those of creditors of, or holders of debt obligations issued by,
such issuers. Furthermore, the rights of holders of common stocks are inferior
to the rights of holders of preferred stocks. Holders of common stocks of the
type held in the Portfolio have a right to receive dividends only when, as and
if, and in the amounts, declared by the issuer's board of directors and to
participate in amounts available for distribution by the issuer only after all
other claims on the issuer have been paid or provided for. By contrast, holders
of preferred stocks have the right to receive dividends at a fixed rate when and
as declared by the issuer's board of directors, normally on a cumulative basis,
but do not ordinarily participate in other amounts available for distribution by
the issuing corporation. Cumulative preferred stock dividends must be paid
before common stock dividends, and any cumulative preferred stock dividend
omitted is added to future dividends payable to the holders of such cumulative
preferred stock. Preferred stocks are also entitled to rights on liquidation
which are senior to those of common stocks. For these reasons, preferred stocks
entail less risk than common stocks. However, neither preferred nor common
stocks represent an obligation or liability of the issuer and therefore do not
offer any assurance of income or provide the degree of protection of capital of
debt securities.
 
    The issuance of debt securities (as compared with both preferred and common
stock) and preferred stock (as compared with common stock) will create prior
claims for payment of principal and interest (in the case of debt securities)
and dividends and liquidation preferences (in the case of preferred stock) which
could adversely affect the ability and inclination of the issuer to declare or
pay dividends on its common stock or the rights of holders of common stock with
respect to assets of the issuer upon liquidation or bankruptcy. Further, unlike
debt securities which typically have a stated principal amount payable at
maturity (which value will be subject to market fluctuations prior thereto), or
preferred stocks which typically have a liquidation preference and which may
have stated optional or mandatory redemption provisions, common stocks have
neither a fixed principal amount nor a maturity date and have values which are
subject to market fluctuations for as long as the common stocks remain
outstanding. Additionally, market timing and volume trading will also affect the
underlying value of Securities, including the Sponsor's buying of additional
Securities and the Trust's selling of Securities during the Liquidation Period.
The value of the Securities in the Portfolio thus may be expected to fluctuate
over the entire life of the Trust to values higher or lower than those
prevailing on the Initial Date of Deposit. The Sponsor may direct the Trustee to
dispose of Securities under certain specified circumstances (see "Administration
of the Trust--Portfolio Supervision"). However, Securities will not be disposed
of solely as a result of normal fluctuations in market value.
 
   
LIQUIDITY
    
 
   
    Whether or not the Securities are listed on a national securities exchange,
the principal trading market for the Securities may be in the over-the-counter
market. As a result, the existence of a liquid trading market for the Securities
may depend on whether dealers will make a market in the Securities. There can be
no assurance that a market will be made for any of the Securities, that any
market for the Securities will be maintained or of the liquidity of the
Securities in any markets made. In addition, the Trust may be restricted under
the Investment Company Act of 1940 from selling Securities to the Sponsor. The
price at which the Securities may be sold in connection with redemptions and the
value of the Trust will be adversely affected if trading markets for the
Securities are limited or absent.
    
 
   
    One or more of the Securities in the portfolio of the Trust may be a
restricted security meaning a security that cannot be sold publicly by the
Trustee without registration under the Securities Act of 1933, as amended. (See
"Schedule of Portfolio Securities"). The Trust will obtain registration rights
or other rights which will enable the restricted securities to be sold at the
public market price for such securities. To the extent a registration rights or
other rights agreement is not honored or cannot otherwise be utilized, the Trust
would attempt to sell the restricted securities to an institutional investor.
There can be no assurance that there will be a market by institutional investors
for such securities. Any such sale may be at a price substantially below the
public market price for the security and may result in a loss to unit holders.
    
 
                                       7
<PAGE>
DISTRIBUTION
 
    The Record Dates and the Distribution Dates are set forth in Part A hereto.
(See: "Summary of Essential Information".) The distributions will be an amount
equal to such Unit Holder's pro rata portion of the amount of dividend income
received by the Trust and proceeds of the sale of Portfolio Securities,
including capital gains, not used for the redemption of Units, if any (less the
Trustee's fees, Sponsor's portfolio supervision fees and expenses).
Distributions for the account of beneficial owners of Units registered in
"street name" and held by the Sponsor will be made to the investment account of
such beneficial owners maintained with the Sponsor. Whenever required for
regulatory or tax purposes or if otherwise directed by the Sponsor, the Trustee
may make special distributions on special distribution dates to Unit Holders of
record on special record dates declared by the Trustee.
 
                            TAX STATUS OF THE TRUST
 
In the opinion of Cahill Gordon & Reindel, special counsel for the Sponsor,
under existing Federal income tax law:
 
        The Trust is not an association taxable as a corporation for Federal
    income tax purposes, and income received by 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 in the Trust under the grantor trust rules of Sections 671-678 of
    the Internal Revenue Code of 1986, as amended (the "Code"). The total tax
    cost of each Unit purchased solely for cash will equal the cost of Units
    (including any sales charge) plus the amount of organizational expenses
    borne by the Unit Holder. A Unit Holder should determine the tax cost for
    each asset represented by the Holder's Units purchased solely for cash by
    allocating the total cost for such Units (including any sales charge) among
    the assets in the Trust represented by the Units in proportion to the
    relative fair market values thereof on the date the Unit Holder purchases
    such Units. The relevant tax reporting forms sent to Unit Holders will also
    reflect the actual amounts paid to them.
    
 
   
        A Unit Holder will be considered to have received all of the dividends
    paid on the Holder's pro rata portion of each Security when such dividends
    are received by the Trust including the portion of such dividend used to pay
    ongoing expenses and organizational expenses. An individual Unit Holder who
    itemizes deductions will be entitled to an itemized deduction for the
    Holder's pro rata share of fees and expenses (other than organizational
    expenses added to basis) paid by the Trust as though such fees and expenses
    were paid directly by the Unit Holder, but only to the extent that this
    amount together with the Unit Holder's other miscellaneous deductions
    exceeds 2% of the Holder's adjusted gross income. A corporate Unit Holder
    will not be subject to this 2% floor.
    
 
        Under the position taken by the Internal Revenue Service in Revenue
    Ruling 90-7, a distribution by the Trustee to a Unit Holder (or to the
    Holder's agent) of such Holder's PRO RATA share of the Securities in kind
    upon redemption or termination of the Trust will not be a taxable event to
    the Unit Holder. Such Unit Holder's basis for Securities so distributed will
    be equal to the Holder's basis for the same Securities (previously
    represented by the Holder's Units) prior to such distribution and the
    holding period for such Securities will include the period during which the
    Unit Holder held the Units. A Unit Holder will have a taxable gain or loss,
    which will be a capital gain or loss except in the case of a dealer, when
    the Unit Holder disposes of such Securities in a taxable transfer.
 
   
        Under the income tax laws of the State and City of New York, the Trust
    is not an association taxable as a corporation and the income of the Trust
    will be treated as the income of the Unit Holders.
    
 
   
        If the proceeds received by the Distribution Agent or by the Trustee
    upon the sale of an underlying Security exceed a Unit Holder's adjusted tax
    cost allocable to the Security disposed of, that Unit Holder will realize a
    taxable gain to the extent of such excess. Conversely, if the proceeds
    received by the Distribution Agent or by the Trustee upon the sale of an
    underlying Security are less than a Unit Holder's adjusted tax cost
    allocable to the Security disposed of, that Unit Holder will realize a loss
    
 
                                       8
<PAGE>
    for tax purposes to the extent of such difference except that upon
    reinvestment of proceeds in a New Series in connection with an exchange or
    non In-Kind Rollover the Internal Revenue Service may seek to disallow such
    loss to the extent that the underlying securities in each trust are
    substantially identical and the purchase of units of the New Series take
    place less than thirty-one days after the sale of the underlying Security.
    Under the Code, capital gain of individuals, estates and trusts from
    Securities held for more than 1 year, but not more than 18 months, is
    subject to a maximum nominal tax rate of 28% and for Securities held for
    more than 18 months the maximum nominal tax rate is 20%. Such capital gain
    may, however, result in a disallowance of itemized deductions and/or affect
    a personal exemption phase-out. These maximum lower capital gain rates of
    either 28% or 20% will be unavailable with respect to those Securities which
    have been held for less than a year and a day at the time of sale (including
    sales occasioned by mandatory or early termination of the Trust or exchange
    or rollover of Units). Unit Holders should note that their choice of
    termination or rollover option will affect their ability to achieve an 18
    month holding period.
 
   
    The Trust will own shares in REITs, entities that have elected and qualified
for the special tax treatment applicable to "real estate investment trusts"
under the Code. A number of complex requirements must be satisfied in order for
REIT status to be maintained. If the REIT distributes 95% or more of its real
estate investment trust taxable income, subject to certain adjustments, to its
shareholders, it will not be subject to Federal income tax on the amounts so
distributed. Moreover, if the REIT distributes at least 85% of its ordinary
income and 95% of its capital gain net income it will not be subject to the 4%
excise tax on certain undistributed income of REITs.
    
 
   
    Distributions made to shareholders out of a REIT's current or accumulated
earnings and profits generally will be taxed to shareholders as ordinary
dividend income, except that, subject to the discussion below regarding the new
tax rates contained in the Taxpayer Relief Act of 1997 (the "1997 Act"),
distributions of net capital gain designated by the REIT as capital gain
dividends will be taxed to shareholders as long-term capital gain (to the extent
they do not exceed the REIT's actual net capital gain for the taxable year)
without regard to the period for which the REIT shares have been held. To the
extent that distributions exceed current or accumulated earnings and profits,
they will constitute a return of capital, rather than dividend or capital gain
income, and will reduce the tax basis of the shareholder's shares with respect
to which the distribution is made. To the extent that distributions exceed such
basis, they will be taxed in the same manner as gain from the sale of those
shares.
    
 
   
    A REIT is permitted under the Code to elect to retain and pay income tax on
its net capital gain for any taxable year. Under the 1997 Act, however, for
taxable years beginning after December 31, 1997, if the REIT so elects, a
shareholder must include in income such shareholder's proportionate share of the
REIT's undistributed net capital gain for the taxable year, and will be deemed
to have paid such shareholder's proportionate share of the income tax paid by
the REIT with respect to such undistributed net capital gain. Such tax would be
credited against the shareholder's tax liability and subject to normal refund
procedures. In addition, each shareholder's basis in such shareholder's shares
would be increased by the amount of undistributed net capital gain (less the tax
paid by the REIT) included in the shareholder's income.
    
 
   
    The 1997 Act also alters the taxation of capital gain income for individuals
(and for certain trusts and estates). Gain from the sale or exchange of certain
investments held for more than 18 months will be taxed at a maximum rate of 20%.
Gain from the sale or exchange of such investments held for 18 months or less,
but for more than one year, will be taxed at a maximum rate of 28%. The 1997 Act
also provides a maximum rate of 25% for "unrecaptured section 1250 gain"
recognized on the sale or exchange of certain real estate assets. The 1997 Act
allows the Internal Revenue Service to prescribe regulations on how the 1997
Act's new capital gain rates will apply to sales of capital assets by "pass-thru
entities," which include REITs. To date regulations have not yet been
promulgated. However, in Notice 97-64, issued on November 10, 1997, the Internal
Revenue Service indicated that such regulations will provide that whether
capital gain dividends are taxed at the 28%, 25% or 20% rate will be determined
by reference to the REIT's holding period in the property that generates the
gain and the amount of unrecaptured straight-line depreciation attributable to
such property.
    
 
                                       9
<PAGE>
    Each Unit Holder should consult his, her or its tax advisor with respect to
the application of the above general information to his, her or its own personal
situation.
 
                                RETIREMENT PLANS
 
    Units of the Trust may be suited for purchase by Individual Retirement
Accounts and pension plans or profit sharing and other qualified retirement
plans. Investors considering participation in any such plan should review
specific tax laws and pending legislation relating thereto and should consult
their attorneys or tax advisors with respect to the establishment and
maintenance of any such plan.
 
    A qualified retirement plan provides employee retirement benefits and is
funded in whole or in part by contributions from the employer (including
contributions by a self-employed individual, in which case the plan is sometimes
called a Keogh plan). The employer contributions are, within limits, deductible
in determining the taxable income of the contributing employer for Federal
income tax purposes. Income received by the plan is not taxed when received by
it (nor are plan losses deductible), but distributions from the plan are
generally included in ordinary income of the distributee upon receipt. A lump
sum payout of the entire amount held in such a plan can, however, be eligible
for 5 or 10 year averaging.
 
    An individual retirement account (an "IRA") is similar to a qualified
retirement plan but contributions to an IRA up to $2,000 per year are generally
made by an individual from earned income, rather than by an employer.
(Additional contributions of up to $2,000 may also be made to an IRA of an
individual's spouse provided that the combined income of the individual and his
or her spouse is sufficient.) An individual is permitted to contribute to an IRA
even though he or she is also covered by a qualified retirement plan; but, in
the case of higher-income individuals who are active participants in a qualified
retirement plan, IRA contributions are neither currently deductible nor taxed
when paid out by the IRA (although income earned in the IRA is taxed as ordinary
income when distributed). The IRA beneficiary must not have attained age 70 1/2
by the close of the taxable year for which an IRA contribution is made; and 5
and 10 year averaging is not allowable for IRA distributions. Small employers
can establish so-called SIMPLE IRA plans allowing annual pre-tax contributions
by an employee to an IRA of up to $6,000 (subject to cost-of-living adjustments)
and requiring a minimum level of employer contributions. Two new types of IRAs
have been created by recent legislation effective beginning in 1998: Roth IRAs
and education IRAs. Contributions to Roth IRAs and education IRAs are not
deductible, but distributions of the income of the IRA can be received tax-free
if the applicable requirements are met (however, such income would be taxed upon
distribution if such requirements are not met). Distributions from a Roth IRA
are tax-free if made after satisfaction of a 5-year holding period and (i) on or
after attainment of age 59 1/2, (ii) upon death or disability, or (iii) to buy
or construct a first home as a principal residence for the individual, his
spouse or any child, grandchild or ancestor (up to $10,000). Distributions from
an education IRA are tax-free to the extent not in excess of the beneficiary's
qualified higher education expenses for the applicable year. (Distributions of
the non-deductible contributions themselves would in any event not be taxed.)
Contributions to Roth IRAs are limited to $2,000 per year (reduced by
contributions to other IRAs); contributions to education IRAs are limited to
$500 per year for each beneficiary under age 18. Higher-income individuals
cannot establish Roth IRAs or education IRAs.
 
    Distributions from qualified retirement plans must begin in minimum amounts
no later than the April 1 following the calendar year in which the employee
attains age 70 1/2 (or in the case of a person other than a 5% owner, April 1
following the calendar year in which the employee retires, if later) or within 5
years after his or her prior death if death occurs before distributions begin
(with later distribution allowed for a surviving spouse and with lifetime
annuity-type payouts to any beneficiary permitted). Minimum required
distributions from IRAs (other than Roth IRAs and education IRAs) are governed
by similar rules (except that minimum distributions to the individual for whom
the IRA is maintained must in all cases begin no later than the April 1
following the calendar year in
 
                                       10
<PAGE>
which the individual attains age 70 1/2). Roth IRAs are not required to commence
distributions upon the individual's attainment of age 70 1/2 but are subject to
the foregoing post-death minimum distribution requirements upon the individual's
death. Education IRAs are required to distribute the account balance within 30
days of the death of the designated beneficiary to the beneficiary's estate.
 
    Forms and arrangements for establishing qualified retirement plans and IRAs
are available from the Sponsor, as well as from other brokerage firms, other
financial institutions and others. Fees and charges with respect to such plans
and IRAs are not uniform and may vary from time to time as well as from
institution to institution.
 
    Distributions received from a qualified retirement plan or IRA (other than
an education IRA) before the employee attains age 59 1/2 are subject to a 10%
additional tax on the amount includible in income unless the distribution is (i)
made on or after the employee's death, (ii) attributable to his being disabled,
(iii) in the nature of a life annuity, (iv) made to the employee after
separation from service after attainment of age 55, (v) made from an IRA after
1997 to pay certain qualified higher education expenses for the individual, his
spouse or any child or grandchild, (vi) made from an IRA after 1997 to buy or
construct a first home as a principal residence for the individual, his spouse
or any child, grandchild or ancestor (up to $10,000), or (vii) made for other
reasons specified in the law. Distributions from an education IRA in excess of
qualified higher education expenses are subject to a 10% additional tax on the
amount includible in income, unless the distribution is (i) made on or after the
death of the designated beneficiary, (ii) attributable to the designated
beneficiary's being disabled, or (iii) made on account of a scholarship or
certain other educational assistance allowances. Qualifying distributions from a
qualified retirement plan or from an IRA may, however, be rolled over or
transferred to another qualified retirement plan or IRA under specified
circumstances.
 
    The foregoing information is of a general nature, does not purport to be
complete and relates only to the Federal income tax rules applicable to
qualified retirement plans and IRAs. State and local tax rules and foreign tax
regimes may treat qualified retirement plans and IRAs differently. Anyone
contemplating establishing a qualified retirement plan or IRA or investing funds
of such a plan or IRA in Trust units should consult his, her or its tax advisor
with respect to the tax consequences of any such action and the application of
the foregoing general tax information to his, her or its particular situation.
 
                            PUBLIC OFFERING OF UNITS
 
PUBLIC OFFERING PRICE
 
   
    The Public Offering Price of the Units during the initial public offering
period is computed by determining the value (as set forth below) of the
Securities in the Trust, adding cash and other Trust assets less Trust
liabilities and dividing such sum by the number of Units outstanding. The Units
outstanding may be split (or split in reverse). Commissions and any other
transactional costs, if any, incurred by the Sponsor in connection with the
deposit of additional Securities or contracts to purchase additional Securities
for the creation of Additional Units will be added to the Public Offering Price.
After the Initial Date of Deposit, a proportionate share of amounts in the
Income Account and Principal Account and amounts receivable in respect of stocks
trading ex-dividend (other than money required to be distributed to Unit Holders
on a Distribution Date and money required to redeem tendered Units) is added to
the Public Offering Price. In the event a stock is trading ex-dividend at the
time of deposit of additional Securities, an amount equal to the dividend that
would be received if such stock were to receive a dividend will be added to the
Public Offering Price. The Public Offering Price per Unit is calculated to five
decimal places and rounded up or down to three decimal places. The Public
Offering Price on any particular date will vary from the Public Offering Price
on the Initial Date of Deposit (set forth in the "Summary of Essential
Information") in accordance with fluctuations in the aggregate market value of
the Securities, the amount of available cash on hand in the Trust and the amount
of certain accrued fees and expenses.
    
 
                                       11
<PAGE>
   
    After the initial offering period the Public Offering Price of the Units
will be computed by adding a sales charge to the net asset value of a Unit. The
maximum sales charge will equal 4% of the Public Offering Price (4.167% of the
net amount invested).
    
 
   
    As more fully described in the Indenture, the aggregate market value of the
Securities is determined by the Trustee based on closing prices on the day the
valuation is made as described under "Redemption--Computation of Redemption
Price" or, if there are no such reported prices, by taking into account the same
factors referred to under "Redemption--Computation of Redemption Price".
Determinations are effective for transactions effected subsequent to the last
preceding determination.
    
 
   
    Certain of the Securities may be considered restricted securities within the
meaning of the Securities Act. Restricted securities are subject to limitations
on resale and other restrictions and are often sold at a discount from the
public market price. The Trust will obtain registration rights or other rights
in connection with the acquisition of the restricted securities. Because these
rights will enable the Trust to sell these Securities at the public market price
for the Securities, these Securities will be evaluated at the public market
price. If the Trust cannot sell the Securities at the public market price the
evaluation price of these Securities may be less than the public market price
for such Securities.
    
 
PUBLIC DISTRIBUTION
 
    Units issued on the Initial Date of Deposit and Additional Units issued in
respect of additional deposits of Securities will be distributed to the public
by the Sponsor and through dealers at the Public Offering Price determined as
provided above. 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 determined as provided above.
 
    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. Sales to dealers during the initial
offering period will be made at prices which reflect a concession of 65% of the
applicable sales charge, subject to change from time to time. In addition, 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 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. The Sponsor reserves the right to reject, in
whole or in part, any order for the purchase of Units.
 
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 Equity Trust and to continuously offer to repurchase Units
from Unit Holders at the Sponsor's Repurchase Price. The Sponsor's Repurchase
Price is computed by adding to the aggregate value of the Securities in the
Trust, any cash on hand in the Trust including dividends receivable on stocks
trading ex-dividend (other than money required to redeem tendered Units and cash
deposited by the Sponsor to purchase Securities or cash held in the Reserve
Account) and deducting therefrom expenses of the Trust, Sponsor, counsel and
taxes, if any, and cash held for distribution to Unit Holders of record as of a
date on or prior to the evaluation; and then dividing the resulting sum by the
number of Units outstanding, as of the date of such computation. In addition,
after the initial offering period, the Sponsor's Repurchase Price will be
reduced to reflect the estimated costs of liquidating the Securities to meet
redemption requests. There is no sales charge incurred when a Unit Holder sells
Units
    
 
                                       12
<PAGE>
   
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. 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".
Alternatively, Unit Holders may redeem their Units through the Trustee.
 
   
PROFIT OF SPONSOR
    
 
   
    The Sponsor, in connection with its acting as underwriter with regard to the
Securities deposited in the Trust subsequent to the initial Date of Deposit, may
realize a profit of up to 5% of the market value of the Securities. An
underwriter or underwriting syndicate purchases common stock from the issuer on
a negotiated or competitive bid basis as principal with the motive of marketing
such common stock to investors at a profit. The Sponsor may also realize a
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 on the Initial Date of Deposit see:
"Schedule of Portfolio Securities"). The Sponsor may realize a similar profit
(or loss) in connection with each additional deposit of Securities. In addition,
the Sponsor may have acted as broker in transactions relating to the purchase of
Securities for deposit in the Trust. During the initial public offering period
the Sponsor may realize additional profit (or sustain a loss) due to daily
fluctuations in the 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 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 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, 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.
 
   
    Subsequent to the Initial Offering Period, the sales charge of 4.00% of the
Public Offering Price will be reduced pursuant to the following graduated scale
for sales to any person of at least $25,000. The following scale assumes a
public offering price of $1,000.00 per 100 units:
    
 
   
<TABLE>
<CAPTION>
                                                           SALES CHARGE
                                          ----------------------------------------------
                                                                        PERCENT OF
                                                PERCENT OF          THE AMOUNT INVESTED
                                          PUBLIC OFFERING PRICE        IN SECURITIES
                                          ----------------------   ---------------------
<S>                                       <C>                      <C>
Less than $25,000.......................               %                        %
$25,000 to $49,999......................
$50,000 to $99,999......................
$100,000 to $249,999....................
$250,000 to $999,999....................
$1,000,000 or more......................
</TABLE>
    
 
                                       13
<PAGE>
   
    The reduced sales charges as shown on the chart above will apply to all
purchases of Units of this Trust 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 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.
 
    The dealer concession will be 65% of the sales charge per Unit.
 
                                   REDEMPTION
 
RIGHT OF REDEMPTION
 
   
    One or more Units may be redeemed at the Redemption Price upon delivery of a
request for redemption to the Trustee at its unit investment trust office in the
City of New York, in form satisfactory to the Trustee. A Unit Holder may tender
its Units for redemption at any time after the settlement date for purchase. The
Redemption Price per Unit is calculated as set forth under "Computation of
Redemption Price". There is no sales charge incurred when a Unit Holder tenders
its Units to the Trustee for redemption.
    
 
    On the third business day following the tender to the Trustee of Units to be
redeemed the Unit Holder will be entitled to receive monies per Unit equal to
the Redemption Price per Unit as determined by the Trustee as of the Evaluation
Time on the date of tender.
 
    The "date of tender" is deemed to be the date on which Units are received by
the Trustee, except that as regards Units received after the Evaluation Time,
the date of tender is the next day on which the New York Stock 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.
 
    During the period in which the Sponsor maintains a secondary market for
Units, the Sponsor may repurchase any Unit presented for tender to the Trustee
for redemption no later than the close of business on the next Business Day
following such presentation.
 
    In connection with each redemption the Sponsor will direct the Trustee to
redeem Units in accordance with the procedures set forth in either (a) or (b)
below.
 
    (a) Units will be redeemed by the Trustee solely in cash for any one Unit
Holder tendering less than 25,000 Units. With respect to redemption requests
regarding at least 25,000 Units, the Sponsor may determine, in its discretion,
to direct the Trustee to redeem Units "in kind" by distributing Portfolio
Securities to the redeeming Unit Holder. The Sponsor may direct the Trustee to
redeem Units "in kind" even if it is then maintaining a secondary market in
Units of the Trust. Unit Holders redeeming "in kind" will receive an amount and
value of Trust Securities per Unit equal to the Redemption Price Per Unit as
determined as of the Evaluation Time next following the tender as set forth
herein under "Computation of Redemption Price" below. The distribution "in kind"
for redemption of Units will be held by the Trustee for the account of, and for
disposition in accordance with the instructions of, the tendering Unit Holder.
The tendering Unit Holder will be entitled to receive whole shares of each of
the underlying Portfolio Securities, plus cash equal to the Unit Holder's pro
rata share of the cash balance of the Income and Principal Accounts and cash
from the Principal Account equal to the fractional shares to which such
tendering Unit Holder is entitled. The Trustee, in connection with implementing
the redemption "in kind," procedures outlined above, may make any adjustments
necessary to reflect differences between the Redemption Price of Units and the
value of the Securities distributed "in kind" as of the date of tender. If the
Principal Account does not contain amounts sufficient to cover the required cash
distribution to the tendering Unit Holder, the
 
                                       14
<PAGE>
Trustee is empowered to sell Securities in the Trust Portfolio in the manner
discussed below. A Unit Holder receiving redemption distributions of Securities
"in kind" may incur brokerage costs and odd-lot charges in converting Securities
so received into cash. The Trustee will assess transfer charges to Unit Holders
taking Securities "in kind" according to its usual practice.
 
    The portion of the Redemption Price which represents the Unit Holder's
interest in the Income Account shall be withdrawn from the Income Account to the
extent available. The balance paid on any redemption, including dividends
receivable on stocks trading ex-dividend, if any, shall be drawn from the
Principal Account to the extent that funds are available for such purpose. The
Trustee is authorized by the Agreement to sell Securities in order to provide
funds for redemption. To the extent Securities are sold, the size of the Trust
will be reduced. 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. The Redemption Price received by a tendering Unit Holder may be more
or less than the purchase price originally paid by such Unit Holder, depending
on the value of the Securities in the Portfolio at the time of redemption.
Moreover, due to the minimum lot size 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 on the next following Record Date.
 
    Securities to be sold for purposes of redeeming Units will be selected from
a list supplied by the Sponsor. If not so instructed by the Sponsor, the Trustee
will select the Securities to be sold so as to maintain, as closely as
practicable, the proportionate relationship between the number of shares of each
Security in the Trust.
 
   
    (b) The Trustee will redeem Units in kind by an in kind distribution to The
Chase Manhattan Bank as the Distribution Agent. A Unit Holder will be able to
receive in kind an amount per Unit equal to the Redemption Price per Unit as
determined as of the day of tender. In kind distributions (the "In Kind
Distribution") to Unit Holders will take the form of whole shares of Securities.
Cash will be distributed by the Distribution Agent in lieu of fractional shares.
The whole shares, fractional shares and cash distributed to the Distribution
Agent will aggregate an amount equal to the Redemption Price per Unit.
    
 
    Distributions in kind on redemption of Units shall be held by the
Distribution Agent, whom each Unit Holder shall be deemed to have designated as
his agent upon purchase of a Unit, for the account, and for disposition in
accordance with the instructions of, the tendering Unit Holder as follows:
 
    (i) The Distribution Agent shall sell the In Kind Distribution as of the
close of business on the date of tender or as soon thereafter as possible and
remit to the Unit Holder not later than seven calendar days thereafter the net
proceeds of sale, after deducting brokerage commissions and transfer taxes, if
any, on the sale unless the tendering Unit Holder requests a distribution of the
Securities as set forth in paragraph (ii) below. The Distribution Agent may sell
the Securities through the Sponsor, and the Sponsor may charge brokerage
commissions on those sales.
 
    (ii) If the tendering Unit Holder requests distribution in kind and tenders
in excess of 25,000 Units, the Distribution Agent shall sell any portion of the
In Kind Distribution represented by fractional interests in shares in accordance
with the foregoing and distribute the net cash proceeds plus any other
distributable cash to the tendering Unit Holder together with certificates or
book-entry credit to the account of the Unit Holder at the Sponsor representing
whole shares of each of the Securities comprising the In Kind Distribution.
 
    The 25,000 Unit threshold will not apply to redemptions in kind in
connection with a rollover or on an In-Kind Distribution Date in connection with
the termination of the Trust.
 
    The portion of the Redemption Price which represents the Unit Holder's
interest in the Income Account shall be withdrawn from the Income Account to the
extent available. The balance paid on any redemption, including dividends
receivable on stocks trading ex-dividend, if any, shall be drawn from the
Principal Account to the extent that funds are available for such purpose. To
the extent Securities are distributed in kind to the Distribution Agent, the
size of the Trust will be reduced. Sales by the Distribution
 
                                       15
<PAGE>
Agent may be required at a time when Securities would not otherwise be sold and
might result in lower prices than might otherwise be realized. The Redemption
Price received by a tendering Unit Holder may be more or less than the purchase
price originally paid by such Unit Holder, depending on the value of the
Securities in the Portfolio at the time of redemption.
 
    Securities to be sold for purposes of redeeming Units will be selected from
a list supplied by the Sponsor. If not so instructed by the Sponsor, the Trustee
will select the Securities to be sold so as to maintain, as closely as
practicable, the proportionate relationship between the number of shares of each
Security in the Trust.
 
COMPUTATION OF REDEMPTION PRICE
 
    The Trust Evaluation per Unit is determined as of the Evaluation Time stated
under "Summary of Essential Information" above (a) semiannually, on the last
Business Day of each of the months of June and December, (b) on the day on which
any Unit of the Trust is tendered for redemption (unless tender is made after
the Evaluation Time on such day, in which case Tender shall be deemed to have
been made on the next day subsequent thereto on which the New York Stock
Exchange is open for trading) and (c) on any other Business Day desired by the
Sponsor or the Trustee, (1) by adding:
 
        a.  The aggregate value of Securities in the Trust, as determined by the
    Trustee;
 
        b.  Cash on hand in the Trust, including dividends receivable on stocks
    trading ex-dividend, other than money deposited to purchase Securities or
    money credited to the Reserve Account;
 
        c.  All other assets of the Trust;
 
   
    (2) and then, by deducting from the resulting figure: amounts representing
any applicable taxes or governmental charges payable by the Trust for the
purpose of making an addition to the reserve account (as defined in the
Agreement, the "Reserve Account"), amounts representing estimated accrued fees
and expenses of the Trust (including legal and auditing expenses), amounts
representing unpaid fees of the Trustee, the Sponsor and counsel, and monies
held to redeem tendered Units and for distribution to Unit Holders of record as
of the Business Day prior to the Evaluation being made on the days or dates set
forth above and then;
    
 
    (3) by dividing the result of the above computation by the total number of
Units outstanding on the date of such Evaluation. The resulting figure equals
the Redemption Price for each Unit.
 
    In addition, after the initial offering period, the Redemption Price will be
reduced to reflect estimated costs of liquidating the Securities to meet the
redemption.
 
   
    The aggregate value of the Securities shall be determined by the Trustee in
good faith in the following manner: If the Securities are listed on one or more
national securities exchanges, such valuation shall be based on the closing
price on such exchange which is the principal market thereof and which shall be
deemed to be the New York Stock Exchange if the Securities are listed thereon
(unless the Trustee deems such price inappropriate as a basis for valuation). If
the Securities are not so listed, or, if so listed and the principal market is
other than such exchange or there is no closing price on such exchange, such
valuation shall be based on the closing price in the over-the-counter market
(unless the Trustee deems such price inappropriate as a basis for valuation) or
if there is no such closing price, by any of the following methods which the
Trustee deems appropriate: (i) on the basis of current bid 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, or (ii) if bid prices are not available for any of such Securities, on
the basis of bid prices for comparable securities, or (iii) by appraisal of the
value of the Securities on the bid side of the market or by such other appraisal
as is deemed appropriate, or (iv) by any combination of the above.
    
 
                                       16
<PAGE>
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 (i) for any period during which the New York Stock Exchange, Inc.
is closed, other than for customary weekend and holiday closings, or (ii) for
any period during which, as determined by the Securities and Exchange
Commission, either trading on the New York Stock Exchange, Inc. is restricted or
an emergency exists as a result of which disposal or evaluation of the
Securities is not reasonably practicable, or (iii) 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.
 
                                EXCHANGE OPTION
 
    Unit Holders of any Dean Witter Select Trust or any holders of units of any
other unit investment trust (collectively, "Holders") may elect to exchange any
or all of their units for units of one or more of any series of the Dean Witter
Select Equity Trust or for units of any other Dean Witter Select Trusts, that
may from time to time be made available for such exchange by the Sponsor (the
"Exchange Trusts"). Such an exchange is implemented by a sale of Units and a
purchase of the units of an Exchange Trust. Such units may be acquired at prices
based on reduced sales charges per unit. The purpose of such reduced sales
charge is to permit the Sponsor to pass on to the Holder who wishes to exchange
units the cost savings resulting from such exchange. The cost savings result
from reductions in time and expense related to advice, financial planning and
operational expense required for the Exchange Option. The following Exchange
Trusts are currently available: the Dean Witter Select Municipal Trust, the Dean
Witter Select Government Trust, the Dean Witter Select Equity Trust, the Dean
Witter Select Investment Trust and the Dean Witter Select Corporate Trust.
 
    Each Exchange Trust has different investment objectives: a Holder should
read the Prospectus for the applicable Exchange Trust carefully to determine the
investment objective prior to exercise of this option.
 
    This option will be available provided the Sponsor maintains a secondary
market in units of the applicable Exchange Trust and provided that units of the
applicable Exchange Trust are available for sale and are lawfully qualified for
sale in the state in which the Holder is a resident. While it is the Sponsor's
present intention to maintain a secondary market for the units of Exchange
Trusts, there is no obligation on its part to do so. Therefore, there is no
assurance that a market for units will in fact exist on any given date in which
a Holder wishes to sell or exchange Units; thus, there is no assurance that the
Exchange Option will be available to any Unit Holder. The Sponsor reserves the
right to modify, suspend or terminate this option. Sixty days notice will be
given prior to the date of the termination of or a material amendment to the
Exchange Option except that no notice need be given in certain circumstances
approved by the Securities and Exchange Commission. In the event the Exchange
Option is not available to a Unit Holder at the time such Unit Holder wishes to
exercise such option, the Unit Holder will be immediately notified and no action
will be taken with respect to such tendered Units without further instruction
from the Unit Holder.
 
    Exchanges will be affected in whole units only. Any excess proceeds from the
surrender of a Unit Holder's Units will be returned. Alternatively, Unit Holders
will be permitted to make up any difference between the amount representing the
Units being submitted for exchange and the amount representing the units being
acquired up to the next highest number of whole units.
 
    An exchange of Units pursuant to the Exchange Option will constitute a
"taxable event" under the Code, i.e., a Holder will recognize a gain or loss at
the time of exchange, except that, upon an exchange of Units for units of any
series of the Exchange Trusts which are grantor trusts for U.S. federal income
tax purposes the Internal Revenue Service may seek to disallow any loss incurred
upon such exchange to the extent that the underlying securities in each Trust
are substantially identical and the purchase of the units of an Exchange Trust
takes place less than thirty-one days after the sale of the Units. In order to
avoid the potential disallowance of losses for tax purposes, a Unit Holder may
notify the Sponsor that the Unit Holder desires to purchase units of the
 
                                       17
<PAGE>
Exchange Trust on the thirty-first day after the day of the sale of the Units
exchanged. The proceeds of the Units surrendered will be deposited in the Unit
Holder's brokerage account at the Sponsor and may be withdrawn at any time. Cash
from the account will be utilized to purchase units of the Exchange Trust on the
thirty-first day after the day of sale of the Units exchanged in accordance with
the procedures set forth above. A Unit Holder may revoke the order to purchase
at any time prior to the purchase on the thirty-first day by calling his
financial advisor. Units will be purchased at a price based upon the net asset
value per unit plus the applicable sales charge of 2.0%. However, there can be
no assurance that a market for units will exist on such date or that units will
be available for purchase on such date. If units are unavailable, the Sponsor
may acquire units in the secondary market or create units as soon as possible
thereafter, which units will be sold by the Sponsor based on the net asset value
on the date of purchase of the units plus the applicable sales charge of 2.0%.
The order does not create a contract or option to acquire units. If units are
not held in the Sponsor's inventory on the 31st day or if the Sponsor does not
create additional units or is unable to acquire units in the secondary market,
units of the Exchange Trust will not be purchased and the cash will remain in
the Unit Holder's account. A Unit Holder who exchanges Units of one Trust for
units of another Trust should consult his or her tax advisor regarding the
extent to which such exchange results in the recognition of a loss for Federal
and/or state or local income tax purposes.
 
    To exercise the Exchange Option, a Unit Holder should notify the Sponsor of
the desire to acquire units of one or more of the Exchange Trusts. Upon the
exchange of Units of the Trust, any Deferred Sales Charge balance will be
deducted from the exchange proceeds. If units of the applicable outstanding
series of the Exchange Trust are at that time available for sale, the Unit
Holder may select the series or group of series for which the Units are to be
exchanged. The Unit Holder will be provided with a current prospectus or
prospectuses relating to each series in which interest is indicated.
 
    The exchange transaction will operate in a manner essentially identical to
any secondary market transaction, i.e., Units will be repurchased at a price
based upon the aggregate bid side evaluation per Unit of the Securities in the
Portfolio. Units of the Exchange Trust will be sold to the Unit Holder at a
price equal to the net asset value based on the offering or bid side evaluation
(as applicable) per unit of the securities in the Exchange Trust's Portfolio,
plus accrued interest, if any, and the applicable sales charge of 2.0% of the
Public Offering Price per Unit. If the Exchange Trust is a series of Dean Witter
Select Equity Trust the applicable sales charge on such Trust will be the
Deferred Sales Charge of such Trust which may be more or less than 2.0% of the
Public Offering Price.
 
                              REINVESTMENT PROGRAM
 
   
    Unit Holders may elect to have the distributions with respect to their Units
automatically reinvested in additional Units of the Trust. The Unit Holder may
participate in the Trust's reinvestment program (the "Program") by filing with
the Trustee a written notice of election. The Unit Holder's completed notice of
election to participate in the Program must be received by the Trustee at least
ten days prior to the Record Date applicable to any distribution in order for
the Program to be in effect as to such distribution. Elections may be modified
or revoked on similar notice.
    
 
    Such distributions, to the extent reinvested in the Trust, will be used by
the Trustee at the direction of the Sponsor in one or both of the following
manners. (i) The distributions may be used by the Trustee to purchase Units of
this Series of the Trust held in the Sponsor's inventory. The purchase price
payable by the Trustee for each of such Units will be equal to the applicable
Trust evaluation per Unit on (or as soon as possible after) the close of
business on the Distribution Date. The Units so purchased by the Trustee will be
issued or credited to the accounts of Unit Holders participating in the Program.
(ii) If there are no Units in the Sponsor's inventory, the Sponsor may purchase
additional Securities for deposit into the Trust (as described in "Prospectus
Part B--Introduction.") The additional Securities with any necessary cash will
be deposited by the Sponsor with the Trustee in exchange for new Units. The
distributions may then be used by the Trustee to purchase the new Units from the
Sponsor. The price for such new Units will be the applicable Trust evaluation
per Unit on (or as soon as possible after) the close of business on the
 
                                       18
<PAGE>
Distribution Date. (See "Public Offering of Units--Public Offering Price.") The
Units so purchased by the Trustee will be issued or credited to the accounts of
Unit Holders participating in the Program. The Sponsor may terminate the Program
if it does not have sufficient Units in its inventory or it is no longer deemed
practical to create additional Units.
 
    No fractional Units will be issued under any circumstances. If, after the
maximum number of full Units has been issued or credited at the applicable
price, there remains a portion of the distribution which is not sufficient to
purchase a full Unit at such price, the Trustee will distribute such cash to
Unit Holders. The cost of administering the reinvestment program will be borne
by the Trust and thus will be borne indirectly by all Unit Holders.
 
                             RIGHTS OF UNIT HOLDERS
 
UNIT HOLDERS
 
    A Unit Holder is deemed to be a beneficiary of the Trust created by the
Indenture and Agreement and vested with all right, title and interest in the
Trust created therein. A Unit Holder may at any time tender its Units to the
Trustee for redemption.
 
    Unit Holders are required to hold their Units in uncertificated form. The
Trustee will credit a Unit Holder's account with the number of Units held by the
Unit Holder. Units are transferable only on the records of the Trustee upon
presentation of evidence satisfactory to the Trustee for each transfer and any
sums payable for taxes or other governmental charges imposed upon these
transactions and compliance with the formalities necessary to redeem Units.
 
CERTAIN LIMITATIONS
 
    The death or incapacity of any Unit Holder will not operate to terminate the
Trust nor 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.
 
    No Unit Holder shall have the right to vote except with respect to removal
of the Trustee or amendment and termination of the Trust. (See: "Administration
of the Trust--Amendment" and "Administration of the Trust--Termination".) 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 Units outstanding at any
time for purposes of amendment, or termination of the Trust or discharge of the
Trustee, all as provided in the Agreement; however, no Unit Holder shall ever be
under any liability to any third party for any action taken by the Trustee or
Sponsor. Unit Holders will be unable to dispose of any of the Securities in the
Portfolio, as such, and will not be able to vote the Securities. The Trustee, as
holder of the Securities, will have the right to vote all of the voting
Securities held in the Trust, and will vote such Securities in accordance with
the instructions of the Sponsor, if given, otherwise the Trustee shall vote as
it, in its sole discretion, shall determine.
 
                              EXPENSES AND CHARGES
 
EXPENSES
 
    The estimated annual Trust expenses are listed in Part A--Summary of
Essential Information; if actual expenses exceed the estimated amounts such
excess will be borne by the Trust.
 
    All or a portion of the organizational expenses and charges incurred in
connection with the establishment of the Trust including the cost of the
preparation, printing and execution of the Indenture, Registration Statement and
other documents relating
 
                                       19
<PAGE>
to the Trust, Federal and State registration fees and costs, the initial fees
and expenses of the Trustee and legal and auditing expenses will be paid by the
Trust and amortized over the life of the Trust. Historically, the costs of
establishing unit investment trusts have been borne by a trust's sponsor.
Advertising and selling expenses will be paid by the Sponsor at no cost to the
Trust.
 
FEES
 
    The Sponsor's fee, earned for portfolio supervisory services, is based upon
the largest number of Units outstanding during the computation period. The
Sponsor's fee as set forth in "Summary of Essential Information" may exceed the
actual costs of providing portfolio supervisory services for this Trust, but at
no time will the total amount the Sponsor receives for portfolio supervisory
services rendered to all series of the Dean Witter Select Equity Trust in any
calendar year exceed the aggregate cost to it of supplying such services in such
year.
 
    Under the Indenture and Agreement for its services as Trustee and evaluator,
the Trustee receives the fee set forth in "Summary of Essential Information".
Certain regular expenses of the Trust, including certain mailing and printing
expenses, are borne by the Trust.
 
    The Sponsor's fee, the Trustee's fees and the Trust expenses accrue daily
but are paid quarterly from the Income 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 proportion to increases under
the classification "All Services Less Rent" in the Consumer Price Index
published by the United States Department of Labor or, if no longer published, a
similar index. The Trustee, pursuant to normal banking procedures, also receives
benefits to the extent that it holds funds on deposit in various non-interest
bearing accounts created under the Indenture and Agreement.
 
OTHER CHARGES
 
    The following additional charges are or may be incurred by the Trust as more
fully described in the Indenture and Agreement: (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 negligence, bad faith, wilful
malfeasance or wilful 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
Agreement without gross negligence, bad faith, wilful malfeasance or wilful
misconduct or reckless disregard of its obligations and duties, (g) expenditures
incurred in contacting Unit Holders upon termination of the Trust, and (h)
brokerage commissions or charges incurred in connection with the purchase or
sale of Securities.
 
PAYMENT
 
    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. Dividends
on the Securities are expected to be sufficient to pay the estimated expenses of
the Trust. If the balances in the Income and Principal Account 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 may
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 lot size 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.
 
                                       20
<PAGE>
                          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 4 New York Plaza, New York, New York
10004. These records and accounts 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 an executed copy of the
Indenture and Agreement together with a current list of the Securities then 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
 
   
    Dividends payable to the Trust as a holder of record of its Securities are
credited by the Trustee to an Income Account, as of the date on which the Trust
is entitled to receive such dividends. Other receipts, including return of
investment and gain and amounts received upon the sale, pursuant to the
Indenture and Agreement, of rights to purchase other Securities distributed in
respect of the Securities in the Portfolio, are credited to a Principal Account.
Any distribution for each Unit Holder as of a Record Date will be made on the
next following Distribution Date or shortly thereafter and shall consist of an
amount approximately equal to the dividend income per Unit, after deducting
estimated expenses, if any, plus such Holder's pro rata share of the
distributable cash balance of the Principal Account. Proceeds received from the
disposition of any of the Securities which are not used for redemption of Units
will be held in the Principal Account to be distributed on the Distribution Date
following receipt of such proceeds. No distribution need be made from the
Principal Account if the balance therein is less than $1.00 per 100 Units
outstanding. A Reserve Account may be created by the Trustee by withdrawing from
the Income or Principal Accounts, from time to time, such amounts as it deems
requisite to establish a reserve for any taxes or other governmental charges
that may be payable out of the Trust. Funds held by the Trustee in the various
accounts created under the Indenture are non-interest bearing to Unit Holders.
    
 
    The Trustee will follow a policy that it will place securities acquisition
or disposition transactions with a broker or dealer only if it expects to obtain
the most favorable prices and executions of orders. Transactions in securities
held in the Trust are generally made in brokerage transactions (as distinguished
from principal transactions) and the Sponsor may act as broker therein and
receive commissions thereon if the Trustee expects thereby to obtain favorable
prices and execution. The furnishing of statistical and research information to
the Trustee by any of the securities dealers through which transactions are
executed will not be considered in placing securities transactions.
 
PORTFOLIO SUPERVISION
 
    The original proportionate relationship between the number of shares of each
Security in the Trust will be adjusted to reflect the occurrence of a stock
dividend, a stock split, merger, reorganization or a similar event which affects
the capital structure of the issuer of a Security in the Trust but which does
not affect the Trust's percentage ownership of the common stock equity of such
issuer at the time of such event. If the Trust receives the securities of
another issuer as the result of a merger or reorganization of, or a spin-off,
split-off or split-up by the issuer of a Security included in the original
portfolio, the Trust may hold those securities as if they were one of the
Securities initially deposited and adjust the proportionate relationship
accordingly for all future subsequent deposits. The Portfolio of the Trust is
not "managed" by the Sponsor or the Trustee; their activities described below
are governed solely by the provisions of the Indenture and Agreement. The
Sponsor may direct the Trustee to dispose of Securities upon failure of the
issuer of a Security in the Trust to declare or pay anticipated cash dividends,
institution of certain materially adverse legal proceedings, default under
certain documents materially and adversely affecting future declaration or
payment of dividends, or the
 
                                       21
<PAGE>
   
occurrence of other market or credit factors that in the opinion of the Sponsor
would make the retention of such Securities in the Trust detrimental to the
interests of the Unit Holders. Except as otherwise discussed herein, the
acquisition of any Securities for the Trust other than those initially deposited
and deposited in order to create additional Units, is prohibited. The Sponsor is
authorized under the Indenture to direct the Trustee to invest the proceeds of
any sale of Securities not required for the redemption of Units in eligible
money market instruments selected by the Sponsor which will include only
negotiable certificates of deposit or time deposits of domestic banks which are
members of the Federal Deposit Insurance Corporation and which have, together
with their branches or subsidiaries, more than $2 billion in total assets,
except that certificates of deposit or time deposits of smaller domestic banks
may be held provided the deposit does not exceed the insurance coverage on the
instrument (which currently is $100,000), and provided further that the Trust's
aggregate holding of certificates of deposit or time deposits issued by the
Trustee may not exceed the insurance coverage of such obligations and U.S.
Treasury notes or bills (which shall be held until the maturity thereof) each of
which matures prior to the earlier of the next following Distribution Date or 90
days after receipt, the principal thereof and interest thereon (to the extent
such interest is not used to pay Trust expenses) to be distributed on the
earlier of the 90th day after receipt or the next following Distribution Date.
    
 
    During the life of the Trust, the Sponsor, as part of its administrative
responsibilities, shall conduct reviews to determine whether or not to recommend
the disposition of Securities. Such determination may be based on analysis
performed by the Portfolio Consultant who will be compensated by the Trust for
providing such service. In addition, the Sponsor shall undertake to perform such
other reviews and procedures as it may deem necessary in order for it to give
the consents and directions, including directions as to voting on the underlying
Securities, required by the Indenture and Agreement. For the administrative
services performed in making such recommendations and giving such consents and
directions, and in making the reviews called for in connection therewith the
Sponsor shall receive the portfolio supervisory fee referred to under "Summary
of Essential Information".
 
VOTING OF THE PORTFOLIO SECURITIES
 
    Pursuant to the Indenture and Agreement, voting rights with respect to the
Portfolio Securities and Replacement Securities, if any, will be exercised by
the Trustee in accordance with the Indenture or the directions given by the
Sponsor.
 
REPORTS TO UNIT HOLDERS
 
   
    With each distribution, the Trustee will furnish to Unit Holders a statement
of the amount of income and other receipts distributed, including the proceeds
of the sale of the Securities expressed in each case as a dollar amount per
Unit.
    
 
    Within a reasonable period of time after the last Business Day in each
calendar year, but not 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:
 
        1.  As to the Income and Principal Account:
 
           (a) the amount of income received on the Securities;
 
           (b) the amount paid for redemption of Units;
 
   
           (c) the deductions for applicable taxes or other governmental
       charges, if any, and fees and expenses of the Sponsor, the Trustee and
       counsel;
    
 
   
           (d) the amounts distributed from the Income Account;
    
 
   
           (e) any other amount credited or deducted from the Income Account;
       and
    
 
   
           (f)  the net amount remaining after such payments and deductions
       expressed both as a total dollar amount and as a dollar amount per Unit
       outstanding on the last business day of such calendar year.
    
 
                                       22
<PAGE>
        2.  The following information:
 
           (a) a list of the Securities as of the last business day of such
       calendar year;
 
           (b) the number of Units outstanding as of the last business day of
       such calendar year;
 
           (c) the Unit Value (as defined in the Agreement) based on the last
       Evaluation made during such calendar year; and
 
           (d) the amounts actually distributed during such calendar year from
       the Income and Principal Accounts, separately stated, expressed both as
       total dollar amounts and as dollar amounts per Unit outstanding on the
       Record Dates for such distributions.
 
AMENDMENT
 
    The Indenture and Agreement may be amended from time to time by the Trustee
and the Sponsor 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 therein which may be defective or inconsistent with any
other provision contained therein; (b) to change any provision thereof as may be
required by the Securities and Exchange Commission or any successor governmental
agency exercising similar authority; or (c) to make such other provision in
regard to matters or questions arising thereunder as shall not adversely affect
the interest of the Unit Holders; provided, that the Indenture and Agreement may
also be amended from time to time by the parties thereto (or the performance of
any of the provisions of this Indenture and Agreement may be waived) with the
expressed written consent of Holders of Units evidencing 51% of the Units at the
time outstanding under the Indenture and Agreement for the purpose of adding any
provisions to or changing in any manner or eliminating any of the provisions of
the Indenture and Agreement or of modifying in any manner the rights of the Unit
Holders; provided, further however, that the Indenture and 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 Agreement or such lesser amount as may be
outstanding at any time during the term of the Indenture except as the result of
the deposit of Additional Securities, as therein provided, or reduce the
relative interest in the Trust of any Unit Holder without his consent, (2)
permit the deposit or acquisition thereunder of securities or other property
either in addition to or in substitution for any of the Securities except in the
manner permitted by the Trust Indenture as in effect on the date of the first
deposit of Securities or permit the Trustee to engage in business or investment
activities not specifically authorized in the Indenture and Agreement as
originally adopted or (3) adversely affect the characterization of the Trust as
a grantor trust for federal income tax purposes.
 
TERMINATION
 
    The Indenture and Agreement provides that the Trust will be liquidated
during the Liquidation Period as set forth under "Summary of Essential
Information" and terminated at the end of such period. Additionally, if the
value of the Trust as shown by any Evaluation is less than forty percent (40%)
of the value of the Securities deposited in the Trust on the Initial Date of
Deposit and thereafter, the Trustee will, if directed by the Sponsor in writing,
terminate the Trust. The Trust may also be terminated at any time by the written
consent of Unit Holders owning 51% or more of the Units then outstanding. Unit
Holders will receive their final distributions (that is, their pro rata
distributions realized from the sale of Portfolio Securities plus any other
Trust assets, less Trust expenses) according to their Election Instructions. The
Election Instructions will provide for the following distribution options: (1)
cash distributions; (2) distributions "in kind"; or (3) investment of the
distributions attributable to the Unit Holder in units of a subsequent series of
the Dean Witter Select Equity Trust as designated by the Sponsor (the "New
Series") if such New Series is offered at such time (the "Rollover Option").
Unit Holders who do not tender properly completed Election Instructions to the
Trustee will be deemed to have elected a cash distribution.
 
                                       23
<PAGE>
    CASH OR "IN KIND" DISTRIBUTIONS. Unit Holders holding Units at termination
will receive distributions in respect of their Units in cash, unless they
indicate to the Trustee that they wish to receive termination distributions "in
kind", by returning to the Trustee properly completed Election Instructions
distributed by the Trustee to such Unit Holders of record 45 days prior to the
Termination Date. No minimum number of Units are needed to elect an in kind
distribution. The Trustee will duly honor such election instructions received on
or before the In Kind Distribution Date. Such Unit Holder will be entitled to
receive whole shares of each of the underlying Portfolio Securities and cash
from the Principal Account equal to the fractional shares to which such
tendering Unit Holder is entitled. A Unit Holder receiving distributions of
Securities "in kind" may incur brokerage and odd-lot costs in converting
Securities so received into cash. The Trustee will transfer the Securities to be
delivered in kind to the account of, and for disposition in accordance with the
instructions of, the Unit Holder.
 
   
    ROLLOVER OPTION. A Unit Holder may elect to invest the distributions
attributable to the Unit Holder in units of a New Series. It is expected that
the terms of the New Series will be substantially the same as the terms of the
Trust described in this Prospectus, and that similar options to invest in a
subsequent series of the Trust will be exercisable as respects termination
distributions from each New Series of the Trust approximately four years after
that New Series' creation. The availability of this option does not constitute a
solicitation of an offer to purchase Units of a New Series or any other
security. A Unit Holder's election to exercise this option will be treated as an
indication of interest only. At any time prior to the purchase by a Unit Holder
of units of a New Series, such Unit Holder may change his investment strategy
and receive, in cash, the proceeds of the sale of the Securities.
    
 
    METHOD OF SECURITIES DISPOSAL. The Trustee will begin to sell the remaining
Securities held in the Trust on the next business day following the In-Kind
Date. Since the Trust is not managed, Securities in the Portfolio must be sold
in accordance with the Indenture, which provides for sales over a period of days
or on any one day during the Liquidation Period set forth in the "Summary of
Essential Information". Daily proceeds of such sales will be deposited into the
Trust, will be held in a non-interest bearing account until distributed and will
be of benefit to the Trustee. The sales of Portfolio Securities may tend to
depress the market prices for such Securities and thus reduce the proceeds
available to Unit Holders. The Sponsor believes that gradual liquidation of
Securities during the Liquidation Period may mitigate negative market price
consequences stemming from the trading of large volumes of Securities over a
short period of time. There can be no assurance, however, that such procedures
will effectively mitigate any adverse price consequences of heavy volume trading
or that such procedures will produce a better price for Unit Holders than might
have been obtained had all the Securities been sold on one particular day during
the Liquidation Period.
 
    The Trustee will, after deduction of brokerage charges and costs incurred in
connection with the sale of Securities, any fees and expenses of the Trust and
payment into the Reserve Account of any amount required for taxes or other
governmental charges that may be payable by the Trust, distribute to each Unit
Holder after due notice of such termination, such Unit Holder's pro rata share
in the Income 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 amount
paid by such Unit Holder for Units.
 
    The Division of Investment Management of the SEC is of the view that the
rollover option constitutes an "exchange offer", for the purposes of Section
11(c) of the Investment Company Act of 1940, and would therefore be prohibited
absent an exemptive order. The Sponsor has received an exemptive order under
Section 11(c) which it believes permits it to offer the rollover, but no
assurance can be given that the SEC will concur with the Sponsor's position and
additional regulatory approvals may be required.
 
                                       24
<PAGE>
                       RESIGNATION, REMOVAL AND LIABILITY
 
REGARDING THE TRUSTEE
 
    The Trustee shall be under no liability for any action taken in good faith
in reliance on prima facie properly executed documents or for the disposition of
monies or Securities in the Trust, nor shall the Trustee be liable or
responsible in any way for depreciation or loss incurred by reason of the
disposition of any Securities by the Trustee. However, the Trustee shall be
liable for wilful misfeasance, bad faith or negligence in the performance of its
duties or by reason of its reckless disregard of its obligations and duties
under the Indenture and Agreement. In the event of a failure of the Sponsor to
act, the Trustee may act under the Indenture and Agreement and shall not be
liable for any such action taken by it in good faith. The Trustee shall not be
personally liable for any taxes or other governmental charges imposed upon the
Trust or in respect of the Securities or the interest thereon. The Agreement
also contains other customary provisions limiting the liability of the Trustee
and providing for the indemnification of the Trustee for any loss or claim
accruing to it without negligence, bad faith, wilful misconduct, wilful
misfeasance or reckless disregard of its duties and obligations under the
Agreement on its part.
 
   
    The Trustee or any successor may resign by executing an instrument in
writing, filing the same with the Sponsor and mailing a copy of such notice of
resignation to all Unit Holders then of record. Upon receiving such notice the
Sponsor will use its best efforts to appoint a successor Trustee promptly. 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 Agreement. If
within 30 days of the resignation of a Trustee no successor has been appointed
or, if appointed, has not accepted the appointment, 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.
    
 
REGARDING THE SPONSOR
 
    The Sponsor shall be under no liability to the Trust or to Unit Holders for
taking any action or for refraining from any action in good faith or for errors
in judgment. Nor shall the Sponsor be liable or responsible in any way for
depreciation or loss incurred by reason of the disposition of any Security. The
Sponsor will, however, be liable for its own wilful misfeasance, wilful
misconduct, bad faith, gross negligence or reckless disregard of its duties and
obligations under the Agreement.
 
    If at any time the Sponsor shall resign under the Agreement or shall fail or
be incapable of performing its duties thereunder or shall become bankrupt or its
affairs are taken over by public authorities, the Agreement directs the Trustee
to 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 Indenture and
Agreement and the Trust and liquidate the Trust. The Trustee will promptly
notify Unit Holders of any such action.
 
                                 MISCELLANEOUS
 
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
Morgan Stanley Dean Witter & Co. ("MSDW"), a publicly-held corporation. On May
31, 1997, Dean Witter, Discover & Co., Dean Witter's former parent company, and
Morgan Stanley Group Inc. merged to form MSDW. Dean Witter is a financial
services company that provides to its individual, corporate, and institutional
clients services as a broker in securities and
    
 
                                       25
<PAGE>
   
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
Options 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 more than 350 domestic and international offices with approximately
10,000 account executives servicing individual and institutional client
accounts.
    
 
TRUSTEE
 
   
    The Trustee is The Chase Manhattan Bank, a New York Bank with its principal
executive office located at 270 Park Avenue, New York, New York 10017. The
Trustee is organized under the laws of the State of New York, 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. Unit Holders should direct inquiries regarding distributions, address
changes and other matters relating to the administration of the Trust to the
Trustee at Unit Investment Trust Division, 4 New York Plaza, New York, New York
10004.
    
 
LEGAL OPINIONS
 
    The legality of the Units offered hereby has 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 Statement of Financial Condition and Schedule of Portfolio Securities of
this series of the Dean Witter Select Equity Trust included in this Prospectus
have been audited by Deloitte & Touche LLP, certified public accountants, as
stated in their report as set forth in Part A of this Prospectus, and are
included in reliance upon such report given upon the authority of that firm as
experts in accounting and auditing.
 
                                       26
<PAGE>
  NO PERSON IS AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
  REPRESENTATIONS WITH RESPECT TO THIS INVESTMENT COMPANY NOT CONTAINED IN
  PARTS A AND B OF THIS PROSPECTUS; AND ANY INFORMATION OR REPRESENTATION NOT
  CONTAINED HEREIN MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED. PARTS A
  AND B OF THIS PROSPECTUS DO 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.
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                        PAGE
                                                                        -----
<S>                                                                     <C>
PART A
Summary of Essential Information......................................      i
Independent Auditors' Report..........................................     ix
Statement of Financial Condition......................................      x
Schedule of Portfolio Securities......................................    xii
PART B
Introduction..........................................................      1
The Trust.............................................................      3
    Objectives and Securities Selection...............................      3
    Summary Description of the Portfolio..............................      3
    Risk Factors--Special Considerations..............................      4
    Distribution......................................................      8
Tax Status of the Trust...............................................      8
Retirement Plans......................................................     10
Public Offering of Units..............................................     11
    Public Offering Price.............................................     11
    Public Distribution...............................................     12
    Secondary Market..................................................     12
    Profit of Sponsor.................................................     13
    Volume Discount...................................................     13
Redemption............................................................     14
    Right of Redemption...............................................     14
    Computation of Redemption Price...................................     16
    Postponement of Redemption........................................     17
Exchange Option.......................................................     17
Reinvestment Program..................................................     18
Rights of Unit Holders................................................     19
    Unit Holders......................................................     19
    Certain Limitations...............................................     19
Expenses and Charges..................................................     19
    Expenses..........................................................     19
    Fees..............................................................     20
    Other Charges.....................................................     20
    Payment...........................................................     20
Administration of the Trust...........................................     21
    Records and Accounts..............................................     21
    Distribution......................................................     21
    Portfolio Supervision.............................................     21
    Voting of the Portfolio Securities................................     22
    Reports to Unit Holders...........................................     22
    Amendment.........................................................     23
    Termination.......................................................     23
Resignation, Removal and Liability....................................     25
    Regarding the Trustee.............................................     25
    Regarding the Sponsor.............................................     25
Miscellaneous.........................................................     25
    Sponsor...........................................................     25
    Trustee...........................................................     26
    Legal Opinions....................................................     26
Auditors..............................................................     26
</TABLE>
    
 
      37272
 
[LOGO] DEAN WITTER SELECT EQUITY TRUST
   
MORGAN STANLEY DEAN WITTER
REIT PORTFOLIO SERIES 98-1
    
- ------------------------
(A Unit Investment Trust)
 
Sponsor:
- -------------------------------------------
[LOGO] DEAN WITTER REYNOLDS INC.
- -------------------------------------------
               Two World Trade Center - New York, New York 10048
 
             READ AND RETAIN THIS PROSPECTUS FOR FUTURE REFERENCE.
 
This prospectus may be used as a preliminary prospectus for a future series,
such as when Units of this Trust are no longer available, or for Investors who
will reinvest into subsequent series of the Trust. In such cases, Investors
should note that:
 
    Information contained herein is subject to amendment. A registration
statement relating to securities of a future series has been filed with the
Securities and Exchange Commission. These securities may not be sold nor may
offers to buy be accepted prior to the time the registration statement becomes
effective. This Prospectus shall not constitute an offer to sell or the
solicitation of an offer to buy nor shall there be any sale of these securities
in any State in which such offer, solicitation or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.
<PAGE>

          PART II.  ADDITIONAL INFORMATION NOT REQUIRED IN PROSPECTUS

                       CONTENTS OF REGISTRATION STATEMENT

       This registration statement on Form S-6 comprises the fol-
          lowing documents:

       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 LLP

The following Exhibits:

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

   ***EX-3(ii)   By-Laws of Dean Witter Reynolds Inc.

     *EX-4.1     Trust Indenture and Agreement, dated September 30, 1993.

    **EX-4.2     Draft of Reference Trust Agreement.

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

  ****EX-23.1    Consent of Independent Auditors.

  ****EX-23.2    Consent of Cahill Gordon & Reindel
                 (included in Exhibit 5).

   
- ---------------------------
    
*     The Trust Indenture and Agreement is incorporated by reference to 
      exhibit of same designation filed with the Securities and Exchange 
      Commission as an exhibit to the Registration Statement of Dean Witter 
      Select Equity Trust, Selected Opportunities Series 18, Registration 
      number 33-50105 and as amended and filed as an exhibit to Dean Witter 
      Select Equity Trust, Select 10 Industrial Portfolio 98-1, Registration 
      Number 333-41785.
   
**    Previously filed.
    
***   Incorporated by reference to exhibit of same designation filed 
      with the Securities and Exchange Commission as an exhibit to the 
      Registration Statement of Sears Tax-Exempt Investment Trust, Insured 
      Long Term Series 33 and Long Term Municipal Portfolio Series 106, 
      Registration numbers 33-38086 and 33-37629, respectively.
****  To be filed by amendment.
<PAGE>


                          SIGNATURES
   
          Pursuant to the requirements of the Securities Act of
1933, the registrant, Dean Witter Select Equity Trust, Morgan
Stanley Dean Witter REIT Portfolio Series 98-1, 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 19th
day of May, 1998.
    
   
                              DEAN WITTER SELECT EQUITY TRUST,
                              MORGAN STANLEY DEAN WITTER
                              REIT PORTFOLIO SERIES 98-1
                              (Registrant)
    
                              By:  Dean Witter Reynolds Inc.
                                   (Depositor)



                                   /s/Thomas Hines
                                   -------------------------
                                   Thomas Hines
                                   Authorized Signatory
<PAGE>

   
          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 Deposi-
tor, by the following person in the following capacities and by
the following persons who constitute a majority of the Deposi-
tor's Board of Directors in the City of New York, and State of
New York, on this 19th day of May, 1998.
    
                              DEAN WITTER REYNOLDS INC.

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

Philip J. Purcell             Chairman & Chief    )
                              Executive Officer   )
                              and Director***     )
Richard M. DeMartini          Director***
Robert J. Dwyer               Director***
Christine A. Edwards          Director***
Charles A. Fiumefreddo        Director**
James F. Higgins              Director***
Mitchell M. Merin             Director*
Stephen R. Miller             Director***
Richard F. Powers III         Director*
Philip J. Purcell             Director***
Thomas C. Schneider           Director**
William B. Smith              Director**

                              By:  /s/Thomas Hines           
                                   --------------------------
                                   Thomas Hines
                                   Attorney-in-fact*, **, ***

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

*    Executed copies of the Powers of Attorney have been filed
     with the Securities and Exchange Commission in connection
     with Amendment No. 1 to the Registration Statement on Form
     S-6 for Dean Witter Select Equity Trust, Select 10 Indus-
     trial Portfolio 97-1, File No. 333-16839.

**   Executed copies of Powers of Attorney have been filed with
     the Securities and Exchange Commission in connection with
     Amendment No. 1 to the Registration Statement on Form S-6
     for Dean Witter Select Equity Trust, Select 10 Industrial
     Portfolio 96-4, File No. 333-10499.

***  Executed copies of Powers of Attorney have been filed with
     the Securities and Exchange Commission in connection with
     the Registration Statement on Form S-6 for Dean Witter Se-
     lect Equity Trust, Select 10 International Series 95-1,
     File No. 33-56389.

<PAGE>

                         Exhibit Index
                              To
                           Form S-6
                    Registration Statement
               Under the Securities Act of 1933

Exhibit No.         Document
- -----------         --------

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

     ***EX-3(ii)    By-Laws of Dean Witter Reynolds Inc.

       *EX-4.1      Trust Indenture and Agreement, dated Sep-
                    tember 30, 1993.

      **EX-4.2      Draft of Reference Trust Agreement.

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

    ****EX-23.1     Consent of Independent Auditors.

    ****EX-23.2     Consent of Cahill Gordon & Reindel
                    (included in Exhibit 5).


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

*    The Trust Indenture and Agreement is incorporated by ref-
     erence to exhibit of same designation filed with the Secu-
     rities and Exchange Commission as an exhibit to the Regis-
     tration Statement of Dean Witter Select Equity Trust, Se-
     lected Opportunities Series 18, Registration number 33-
     50105 and as amended and filed as an exhibit to Dean Wit-
     ter Select Equity Trust, Select 10 Industrial Portfolio
     98-1, Registration Number 333-41785.

**   Previously filed.

***  Incorporated by reference to exhibit of same designation
     filed with the Securities and Exchange Commission as an
     exhibit to the Registration Statement of Sears Tax-Exempt
     Investment Trust, Insured Long Term Series 33 and Long
     Term Municipal Portfolio Series 106, Registration numbers
     33-38086 and 33-37629, respectively.

**** To be filed by amendment.




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