SEARS MUNICIPAL TRUST INSURED LONG TERM SERIES 41
485BPOS, 1997-06-26
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                          Insured National Portfolio Series 41
                                   File No. 33-27810
                 Investment Company Act No. 811-3676

  SECURITIES AND EXCHANGE COMMISSION
        WASHINGTON, D.C.  20549

    POST-EFFECTIVE AMENDMENT NO. 4
              TO FORM S-6

For Registration Under the Securities  Act of 1933 of  Securities
of Unit Investment Trust Registered on Form N-8B-2

  A.   Exact name of Trust:

       DEAN WITTER SELECT MUNICIPAL TRUST
       INSURED NATIONAL PORTFOLIO SERIES 41

  B.   Name of Depositor:
    
       DEAN WITTER REYNOLDS INC.

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

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

  D.   Name and complete address of 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

       Check box if it is proposed that this filing should
  /x/  become effective immediately upon filing pursuant to
       paragraph(b) of Rule 485.
<PAGE>

       Pursuant to Rule 429(b) under the Securities Act of
       1933, the Registration Statement and prospectus
       contained herein relates to Registration Statement No.:

  33-27810
   <PAGE>

                            -5-
    
         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                     *30

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

 9.  Litigation                          *30

  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)


_________________

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

                            -6-

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


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

  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, etc.     Secondary Market; Exchange
                                      Option; Redemption; Rights
                                      of Unit Holders-
                                      Certificates

  e)  Lapses or defaults with         *30
       respect to periodic payment
       plan certificates

  f)  Voting rights as to             Rights of Unit Holder -
       Securities under the           Certain Limitations
       Indenture

  g)  Notice to Holders as to         Amendment and Termination
       change in:                     of the Indenture

       1)  Assets of Trust            Administration of the
                                      Trust-Reports to Unit
                                      Holders; The Trust-Summary
                                      Description of the
                                      Portfolios

       2)  Terms and Conditions of    Amendment and Termination
           Trust's Securities        of the Indenture

       3)  Provisions of Trust        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


_________________

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

                            -7-

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


       2)  Terms and conditions of    Amendment and Termination           
           Trust's Securities         of the Indenture

       3)  Provisions of Indenture    Amendment and Termination
                                      of the Indenture

       4)  Identity of Depositor      *30
           and Trustee

    i)  Other Provisions              Cover of Prospectus; Tax
                                      Status

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

12.  Type of securities comprising       *30
     periodic payment certificates

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

  b)  Certain information             *30
       regarding periodic payment
       certificates

  c)  Certain percentages   Summary of Essential
                            Information; Public
                            Offering of Units-Public
                            Offering Price;-Profit of
                            Sponsor;-Volume Discount

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

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


_________________

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

                            -8-

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


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

  g)  Ratio of annual charges to      *30
       income

14.  Issuance of trust's securities    Introduction; Rights of
                                       Unit Holders-Certificates

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

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

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

18.  a)  Receipt and disposition of     Administration of the
         income                         Trust; Reinvestment
                                        Programs

     b)  Reinvestment of                 Reinvestment Programs
         distributions

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

     d)  Schedule of distribution        *30

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

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

                            -9-

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


20.  Certain miscellaneous provisions    Amendment and Termination
     of the Indenture                    of the Indenture; Sponsor-
                                         Limitation on Liability-
                                         Resignation; Trustee-
                                         Limitation on Liability-
                                         Resignation

21.  Loans to security holders           *30

22.  Limitations on liability            Sponsor, Trustee;
                                         Evaluator-Limitation on
                                         Liability

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

24.  Other material provisions of the    *30
     Indenture

  III.  Organization Personnel and
        Affiliated Persons of Depositor


25.  Organization of Depositor           Sponsor

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

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

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

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

30.  Persons controlling Depositor       *30

31.  Payments by Depositor for           *30
     certain other services

32.  Payments by Depositor for           *30
     certain other services rendered
     to trust

_________________

*30  Not applicable, answer negative or not required.
<PAGE>                            -10-

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


33.  Remuneration of employees of        *30
     Depositor for certain services
     rendered to trust

34.  Remuneration of other persons       *30
     for certain services rendered to
     trust

  IV.  Distribution and Redemption of Securities


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

36.  Suspension of sales of trust's      *30
     securities

37.  Revocation of authority to          *30
     distribute

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

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

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

41.  a)  Business of principal           Sponsor
         underwriter
     b)  Branch offices of principal     *30
         underwriter
     c)  Salesman of principal           *30
         underwriter

42.  Ownership of trust's securities     *30
     by certain persons

43.  Certain brokerage commissions       *30
     received by principal
     underwriter

_________________

*30  Not applicable, answer negative or not required.

<PAGE>

                            -11-

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


44.  a)  Method of valuation             Public Offering of Units

     b)  Schedule as to offering         *30
         price

     c)  Variation in offering price     Public Offering of Units-
         to certain persons             Volume Discount; Exchange
                                        Option

45.  Suspension of redemption rights     *30

46.  a)  Redemption valuation            Public Offering of Units-
                                         Secondary Market;
                                         Redemption

     b)  Schedule as to redemption       *30
         price

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

  V. Information concerning the Trustee or Custodian


48.  Organization and regulation of      Trustee
     Trustee

49.  Fees and expenses of Trustee        Expenses and Charges

50.  Trustee's lien                      Expenses and Charges

  VI.  Information concerning Insurance
       of Holders of Securities         


51.  a)  Name and address of             *30
         Insurance Company

     b)  Type of policies                *30

     c)  Type of risks insured and       *30
         excluded

     d)  Coverage of policies            *30


_________________

*30  Not applicable, answer negative or not required.

<PAGE>

                            -12-

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


  e)  Beneficiaries of policies       *30

  f)  Terms and manner of
      cancellation                    *30
  g)  Method of determining           *30
       premiums

  h)  Amount of aggregate premiums    *30
       paid

  i)  Who receives any part of        *30
       premiums

  j)  Other material provisions of    *30
       the Trust relating to
       insurance

  VII.  Policy of Registrant


52.  a)   Method of selecting and        Introduction Objectives and
          eliminating securities from    Securities Selection; The
          the Trust                      Trust-Summary Description
                                         of the Portfolio Sponsor-
                                         Responsibility

  b)  Elimination of securities       *30
       from the Trust

  c)  Policy of Trust regarding       Introduction Objectives and
       substitution and               Securities Selection;
       elimination of securities      Sponsor-Responsibility;

  d)  Description of any              30
       fundamental policy of the
       Trust

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

  VIII.  Financial and Statistical Information




_________________

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

                            -13-

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


54.  Information regarding the           *30
     Trust's past ten fiscal years

55.  Certain information regarding       *30
     periodic payment plan
     certificates

56.  Certain information regarding       *30
     periodic payment plan
     certificates

57.  Certain information regarding        *30
     periodic payment plan
     certificates

58.  Certain information regarding       *30
     periodic payment plan
     certificates

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

_________________

*30  Not applicable, answer negative or not required.



LOGO

DEAN WITTER SELECT
MUNICIPAL TRUST
   
INSURED NATIONAL PORTFOLIO SERIES 41

Standard & Poor's Corporation Rating: AAA


(A Unit Investment Trust)
_______________________________________________________________

This Trust was formed for the purpose of providing interest
income which in the opinion of bond counsel is, under existing
law, excludable from gross income for Federal income tax purposes
(except in certain instances depending on the Unit Holders) and,
through investment in a fixed portfolio consisting primarily of
investment grade long-term state, municipal and public authority
debt obligations.  The value of the Units of the Trust will
fluctuate with the value of the portfolio of underlying
Securities.  The Units of the Insured National Trust are rated
AAA by Standard & Poor's Corporation because all of the

<PAGE>

                            -2-
Securities have been irrevocably insured by insurance provided by
the respective Issuers thereof or obtained by third parties.
Minimum Purchase: 1 Unit.
_______________________________________________________________
    
This Prospectus consists of two parts.  Part A contains a Summary
of Essential Information and descriptive material relating to the
Trust, and the portfolio and financial statements of the Trust.
Part B contains a general description of the Trust.  Part A may
not be distributed unless accompanied by Part B.
_______________________________________________________________

The Initial Public Offering of Units in the Trust has been
completed.  The Units offered hereby are issued and outstanding
Units which have been acquired by the Sponsor either by purchase
from the Trustee of Units tendered for redemption or in the
Secondary Market.
_______________________________________________________________

Sponsor:    LOGO             DEAN WITTER REYNOLDS INC.
_______________________________________________________________

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

Read and retain both parts of this Prospectus for future
reference.

Units of the Trust are not deposits or obligations of, or
guaranteed or endorsed by, any bank, and the Units are not
federally insured by the Federal Deposit Insurance Corporation,
Federal Reserve Board, or any other agency.

   
 Prospectus Part A dated June 26, 1997
    
                  A-2

<PAGE>

                            -1-



THIS PROSPECTUS DOES NOT CONTAIN ALL OF THE INFORMATION WITH
RESPECT TO THE INVESTMENT COMPANY SET FORTH IN ITS REGISTRATION
STATEMENT AND EXHIBITS RELATING THERETO WHICH HAVE BEEN FILED
WITH THE SECURITIES AND EXCHANGE COMMISSION, WASHINGTON, D.C.,
UNDER THE SECURITIES ACT OF 1933 AND THE INVESTMENT COMPANY ACT
OF 1940, AND TO WHICH REFERENCE IS HEREBY MADE.
   
  DEAN WITTER SELECT MUNICIPAL TRUST
 INSURED NATIONAL PORTFOLIO SERIES 41

           TABLE OF CONTENTS

PART A                                                    Page


Table of Contents......................................  A-1
Summary of Essential Information.......................  A-3
  The Insured National Trust.    ....................... A-10
Independent Auditor's Report...........................  F-1
    
PART B

Introduction...........................................    1
The Trust..............................................    2
 Special Considerations .........   ...................    2
 Summary Description of the Portfolios    .............    3
Insurance on the Securities in an Insured Trust........   21
Objectives and Securities Selection....................   25
The Units..............................................   26
Tax Status.............................................   27
Public Offering of Units...............................   32
  Public Offering Price.............................   32
  Public Distribution...............................   33
  Secondary Market..................................   34
  Profit of Sponsor.................................   35
  Volume Discount...................................   35
Exchange Option........................................   36
Reinvestment Programs..................................   37
Redemption.............................................   38
  Tender of Units...................................   38
  Computation of Redemption Price per Unit..........   39
  Purchase by the Sponsor of Units..................
    Tendered for Redemption.........................   39
Rights of Unit Holders.................................   40
  Certificates......................................   40
  Certain Limitations...............................   40
Expenses and Charges...................................   40
Initial Expenses.......................................   40
                  A-1

<PAGE>

                            -2-


Fees...................................................   40
Other Charges..........................................   41
Administration of the Trust............................   42
  Records and Accounts..............................   42
  Distribution......................................   42
  Distribution of Interest and Principal............   42
  Reports to Unit Holders...........................   44
Sponsor................................................   45
Trustee................................................   47
Evaluator..............................................   48
Amendment and Termination of the Indenture.............   49
Legal Opinions.........................................   50
Auditors...............................................   50
Bond Ratings...........................................   50
Federal Tax Free vs. Taxable Income....................   54

               Sponsor:

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

              Evaluator:

     Kenny S&P Evaluation Services
  A Division of J.J. Kenny Co., Inc.
              65 Broadway
       New York, New York  10006

               Trustee:
   
       The Chase Manhattan Bank
            270 Park Avenue
       New York, New York  10017
    

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




                  A-2

<PAGE>
<PAGE>
<TABLE>
<CAPTION>

                                     SUMMARY OF ESSENTIAL INFORMATION
                                                     
                                    DEAN WITTER SELECT MUNICIPAL TRUST
                                   INSURED NATIONAL PORTFOLIO SERIES 41
                                                     
                                           AS OF APRIL 30, 1997



<S>                                 <C>                 <S>                                      <C>

FACE AMOUNT OF SECURITIES           $3,825,000.00     DAILY RATE AT WHICH ESTIMATED NET
                                                        INTEREST ACCRUES PER UNIT                .0153%
NUMBER OF UNITS                             3,816     
                                                      ESTIMATED CURRENT RETURN (based on
FRACTIONAL UNDIVIDED INTEREST IN THE                    Public Offering Price)<F2>               5.372%
  TRUST REPRESENTED BY EACH UNIT        1/3,816th     
                                                      ESTIMATED LONG TERM RETURN (based on
PUBLIC OFFERING PRICE                                   Public Offering Price)<F2>               5.334%
                                                      
  Aggregate bid side evaluation                       MONTHLY INTEREST DISTRIBUTIONS
    of Securities in the Trust      $3,702,661.00     
                                                        Estimated net annual interest rate
  Divided by 3,816 Units            $      970.30         per Unit times $1,000                 $55.16
                                                        Divided by 12                           $ 4.59
  Plus sales charge of 5.500% of                      
    Public Offering Price (5.820%                     RECORD DATE:  The ninth day of each month
    of net amount invested in                         
    Securities)                             56.47     DISTRIBUTION DATE:  The fifteenth
                                                        day of each month
Public Offering Price per Unit           1,026.77     
  Plus undistributed principal and                    MINIMUM PRINCIPAL DISTRIBUTION:  No
    net investment income and accrued                   distribution need be made from the
    interest                                19.02<F1>   Principal Account if balance therein
                                                        is less than $1 per Unit outstanding
    Adjusted Public Offering Price  $    1,045.79     
                                                      TRUSTEE'S ANNUAL FEE AND EXPENSES
                                                        (including estimated expenses and
SPONSOR'S REPURCHASE PRICE AND                          Evaluator's fee) $1.83 per $1,000
  REDEMPTION PRICE PER UNIT                             face amount of underlying Securities    $ 1.83
  (based on bid side evaluation of                    
  underlying Securities, $56.47                       SPONSOR'S ANNUAL PORTFOLIO SUPERVISION
  less than Adjusted Public Offering                    FEE:  Maximum of $.25 per $1,000
  Price per Unit)                   $      989.32       face amount of underlying Securities       .25
                                                      
                                                      TOTAL ESTIMATED ANNUAL EXPENSES PER
CALCULATION OF ESTIMATED NET                            UNIT                                    $ 2.08
  ANNUAL INTEREST RATE PER UNIT                       
  (based on face amount of $1,000                     EVALUATOR'S FEE FOR EACH EVALUATION:
  per Unit)                                             $.40 per issue of Security.
                                                      
  Annual interest rate per Unit             5.724%    EVALUATION TIME:  4:00 P.M. New York Time
                                                      
  Less estimated annual expenses per                  MANDATORY TERMINATION DATE:  January 1, 2042
    Unit ($2.08) expressed as a                       
    percentage                               .208%    DISCRETIONARY LIQUIDATION AMOUNT:  The Trust
                                                        may be terminated by the Sponsor if the value
Estimated net annual interest rate                      of the portfolio of Trust at any time is less
  per Unit                                  5.516%      than $1,600,000.

                

    <F1>Figure shown includes interest accrued (net of expenses) on the underlying Securities to the expected 
date of settlement (normally three business days after purchase) for Units purchased on April 30, 1997.

   <F2>The estimated current return and estimated long term return are increased for transactions entitled to a 
reduced sales charge.  (See "The Units - Estimated Annual Income and Current Return" and "Public Offering of 
Units - Volume Discount" in Part B of this Prospectus.)

                                                A-3
                                                  
</TABLE>

<PAGE>

                              -4-



                        SUMMARY OF ESSENTIAL INFORMATION
                                  (Continued)
          THE TRUST -- The Dean Witter Select Municipal Trust,
          Insured National Portfolio Series 41 (the "Trust") is a unit
          investment trust which was created on May 25, 1993 (the "Date
          of Deposit"), under the laws of the State of New York pursuant
          to an Indenture as defined in Part B.  The Trust is composed
          of "investment grade" long-term, interest-bearing municipal
          bonds (the "Securities").  (For a description of the meaning
          of "investment grade" securities, see:  "Bond Ratings", in
          Part B.)  The objectives of the Trust are:  (1) the receipt of
          income which, under existing law, is excludable from gross
          income for Federal income tax purposes (except in certain
          instances depending on the Unit Holders) and (2) the
          conservation of capital.  The payment of interest and the
          preservation of principal of the Trust is dependent on the
          continuing ability of the respective Issuers of the Securities
          or the bond insurers thereof to meet their obligations to pay
          principal and interest on the Securities.  Therefore, there is
          no guarantee that the objectives of the Trust will be
          achieved.  All of the Securities in the Portfolio are 
          obligations of states or of the counties, municipalities or
          public authorities thereof.  Interest on the Securities, in
          the opinion of bond counsel or special tax counsel to the
          Issuers thereof, under existing law, is excludable from gross
          income for Federal income tax purposes (except in certain 
          instances depending on the Unit Holders).  (For a discussion 
          of certain tax aspects of the Trust, see:  "Tax Status", in 
          Part B.)

          OFFERS TO SELL OR THE SOLICITATION OF ORDERS TO BUY
          MAY ONLY BE MADE IN THOSE JURISDICTIONS IN WHICH THE UNITS OF
          THE TRUST HAS BEEN REGISTERED.  INVESTORS SHOULD CONTACT
          ACCOUNT EXECUTIVES OF THE SPONSOR TO DETERMINE WHETHER THE
          UNITS OF THIS TRUST HAVE BEEN REGISTERED FOR SALE IN THE STATE
          IN WHICH THEY RESIDE.
      
           INSURANCE -- A policy of insurance guaranteeing the
          scheduled payment of principal and interest ("Bond Insurance")
          has been obtained from the bond insurers indicated on the
          respective "Schedule of Portfolio Securities", herein, and
          paid for by the Issuers of the Securities, or by third
          parties, for all the Securities in the Insured National Trust.
          The policies of Bond Insurance are non-cancelable and cover
          default in the payment of principal and interest on the
          Securities so insured so long as such Securities remain 
          outstanding.  Bond Insurance on all Securities in the Insured 
          National Trust relates only to the Securities in such Insured 
          National Trust and not to the
                    A-4

    <PAGE>

                              -5-
          Units offered hereby.  No representation is made herein as to
          any bond insurer's ability to meet its obligations under a
          policy of Bond Insurance relating to a Security in the Insured
          National Trust.  However, as a result of such Bond Insurance,
          the Securities, as well as the Units of the Insured National
          Trust, are rated "AAA" by Standard & Poor's Corporation. 
          There can be no assurance that such "AAA" ratings will be
          retained. (See:  "Insurance on the Securities in an Insured
          Trust", in Part B.)

          MONTHLY DISTRIBUTIONS -- Monthly distributions of
          principal, premium, if any, and interest received by the Trust
          will be made on or shortly after the fifteenth day of each
          month to Unit Holders of record on the ninth day of such month.
          Alternatively, Unit Holders may elect to have their monthly
          distributions reinvested in either of the Reinvestment Programs
          of the Sponsor, neither of which are insured.  (See:
          "Reinvestment Programs", in Part B.)

           PUBLIC OFFERING PRICE -- The Public Offering Price
          per Unit of each Trust is calculated daily, and is equal to the
          aggregate bid side evaluation of the underlying Securities,
          divided by the number of Units outstanding, plus a sales charge
          calculated by reference to "Sales Charge/Volume Discount",
          below, plus the per Unit balance in the Interest and Principal
          Accounts.  Units are offered at the Public Offering Price, plus
          accrued interest.  (See:  "Public Offering of Units", in Part
          B.)

          ESTIMATED CURRENT RETURN -- The Estimated Current
          Return shows the return based on the Public Offering Price and
          is computed by multiplying the estimated net annual interest
          rate per Unit (which shows the return based on a $1,000 face
          amount) by $1,000 and dividing the result by the Public
          Offering Price (not including accrued interest).  The net
          annual interest rate per Unit will vary with changes in the
          fees and expenses of the Trustee, the Sponsor and the Evaluator
          and with the exchange, redemption, sale or maturity of the
          underlying Securities.  In addition, the Public Offering Price
          will also vary with fluctuations in the bid side evaluation of
          the underlying Securities.  Therefore, it can be expected that
          the Estimated Current Return will fluctuate in the future.
          (See:  "The Units -- Estimated Annual Income and Current
          Return", in Part B.)

          MARKET FOR UNITS -- The Sponsor, though not obligated
          to do so, intends to maintain a market for the Units based on
          the aggregate bid side evaluation of the underlying Securities,
                    A-5
<PAGE>

                              -6-



          as more fully described in Part B -- "Public Offering of Units
        - Secondary Market".  If such market is not maintained, a Unit
          Holder will be able to dispose of its Units through redemption
          at prices based on the aggregate bid side evaluation of the
          underlying Securities.  (See:  "Redemption", in Part B.)
          Market conditions may cause such prices to be greater or less
          than the amount paid for Units.
   
          SPECIAL CONSIDERATIONS -- An investment in Units of
          the Trust should be made with an understanding of the risks
          which an investment in fixed rate long term or intermediate
          term debt obligations may entail, including the risk that the
          value of the Units will decline with increases in interest
          rates.  The Insured National Trust is considered to be
          concentrated in Electric and Power Securities and Health Care
          and Hospital Securities 39.85% and 29.47%, respectively, of the
          aggregate market value of the Insured National Trust
          Portfolio).  (See:  "The Trust -- Special Considerations" and
          "The Trust -- Summary Description of the Portfolios", in
          Part B.  See also:  "The Insured National Trust", herein, for a
          discussion of additional risks relating to Units of the Trust.)

          OTHER INFORMATION -- The Securities in the Portfolio
          of the Trust were chosen in part on the basis of their
          respective maturity dates.  A long term Trust contains
          obligations maturing in 15 years or more from the Date of
          Deposit.  The maturity date of the Trust is January 1, 2042.
          The latest maturity of a Security in the Insured National Trust
          is January 2033; and the average life to maturity (or date of
          pre-refunding of a bond) of the Portfolio of Securities therein
          is 25.971 years.  The actual maturity dates of the Securities
          contained in the Trust are shown on the "Schedule of Portfolio
          Securities", herein.
    
          The Trustee shall receive annually 75 cents per
          $1,000 principal amount of Securities in the Trust for its
          services as Trustee.  See:  "Expenses and Charges", in Part B,
          for a description of other fees and charges which may be
          incurred by a Trust.

          SALES CHARGE/VOLUME DISCOUNT -- The Public Offering
          Price per Unit will be computed by dividing the aggregate of
          the bid prices of the Securities in a Trust by the number of
          Units outstanding and then adding the appropriate sales charge
          described below.  The sales charge will reflect different rates
          depending upon the maturities of the various underlying
                    A-6

<PAGE>

                              -7-



          Securities.  The sales charge per Unit in the secondary market
          (the "Effective Sales Charge") will be computed by multiplying
          the Evaluator's determination of the bid side evaluation of
          each Security by a sales charge determined in accordance with
          the table set forth below based upon the number of years
          remaining to the maturity of each such Security, totalling all
          such calculations, and dividing this total by the number of
          Units then outstanding.  In calculating the date of maturity, a
          Security will be considered to mature on its stated maturity
          date unless:  (a) the Security has been called for redemption
          or funds or securities have been placed in escrow to redeem it
          on an earlier call date, in which case the call date will be
          deemed the date on which such Security matures; or (b) the
          Security is subject to a mandatory tender, in which case the
          mandatory tender date will be deemed the date on which such
          Security matures.

                  (as % of bid    (as % of Public
                   side evaluation)   Offering Price
Time to Maturity


Less than 1 year                         0%                0%
1 year to less than 2 years          0.756%             0.75%
2 years to less than 4 years         1.523%             1.50%
4 years to less than 7 years         2.564%             2.50%
7 years to less than 11 years        3.627%             3.50%
11 years to less than 15 years       4.712%             4.50%
15 years and greater                 5.820%             5.50%
   
            The Effective Sales Charge per Unit for a sale in the
          secondary market, as determined above, will be reduced on a
          graduated scale for sales to any single purchaser on a single
          day of the specified number of Units of a Trust set forth
          below.

  Insured National                          Dealer Concession as
    Trust Number         % of Effective     % of Effective Sales
      of Units             Sales Charge            Charge


1-99...............           100%                  65%
100-249............            95%                  62%
250-499............            85%                  55%
500-999............            70%                  45%
1,000 or more......            55%                  35%
    
                    A-7

<PAGE>

                              -8-



                   To qualify for the reduced sales charge and
         concession applicable to quantity purchases, the selling dealer
         must confirm that the sale is to a single purchaser, as
         described in "Volume Discount" in Part B of the Prospectus.

                   Units purchased at an Effective Sales Charge (before
          volume purchase discount) of less than 3.00% of the Public
          Offering Price (3.093% of the bid side evaluation of the
          Securities) will not be eligible for exchange at a reduced
          sales charge described under the Exchange Option.
                    Dealers purchasing certain dollar amounts of Units
          during the life of the Trusts may be entitled to additional
          concessions.  The Sponsor reserves the right, at any time and
          from time to time, to change the level of dealer concessions.

                    For further information regarding the volume
          discount, see:  "Public Offering of Units -- Volume Discount",
          in Part B.
   
                    Note:  "Auditors" in Part B is amended so that
          "Deloitte & Touche" is replaced with "Deloitte & Touche LLP";
          "Evaluator" in Part B is amended so that "Kenny S&P Evaluation
          Services, a division of Kenny Information Systems, Inc." is
          replaced with "Kenny S&P Evaluation Services, a Division of
          J.J. Kenny Co., Inc."; and "Trustee" in Part B is amended so
          that "United States Trust Company of New York, with its
          principal place of business at 114 West 47th Street, New York,
          New York 10036, and its unit investment trust office at 770
          Broadway, New York, New York 10003" is replaced with "The Chase
          Manhattan Bank, a New York Bank with its principal executive
          office located at 270 Park Avenue, New York, New York 10017 and
          its unit investment trust office at 4 New York Plaza, New York,
          New York 10004".  The reference to the fifth and five business
          day in "Redemption -- Computation of Redemption Price per Unit"
          and "Administration of the Trust -- Distribution of Interest
          and Principal" in Part B is amended to read third and three,
          respectively.  "Insurance on the Securities in an Insured
          Trust" in Part B is amended to add the following paragraph
          before "Ambac Indemnity":

                 On December 20, 1995, Capital Guaranty Corporation
          merged with a subsidiary of Financial Security Assurance
          Holdings Ltd.  In connection with such merger, (i) CGIC, the
          principal operating subsidiary of Capital Guaranty Corporation,
          became a wholly-owned subsidiary of FSA, the principal
          operating subsidiary of Financial Security Assurance Holdings

                    A-8

<PAGE>

                              -9-



          Ltd., and (ii) the corporate name of CGIC was changed to
          Financial Security Assurance of Maryland Inc.

                    On May 31, 1997, Dean Witter, Discover & Co., Dean
          Witter's former parent company, and Morgan Stanley Group Inc.
          merged to form MSDWD.  In connection with such merger, the
          corporation name of DWDC was changed to Morgan Stanley, Dean
          Witter, Discover & Co. ("MSDWD").
    
                   A-9

<PAGE>


                             -10-




                            THE INSURED NATIONAL TRUST
   
                    The Portfolio of the Insured National Trust consists
          of eight issues of Securities, seven of which were issued by
          Issuers located in six states and one of which (approximately
          13.11% of the aggregate market value of the Insured National
          Trust Portfolio) was issued by an Issuer located in the
          District of Columbia.  Two issues of Securities are each a
          general obligation of an Issuer.  86.89% issues of Securities,
          while not backed by the taxing power of the Issuer, are payable
          from revenues or receipts derived from specific projects or
          other available sources.  The Insured National Trust contains
          the following categories of Securities:

                            Percentage of Aggregate
                        Market Value of Trust Portfolio
                              (as of June 6, 1997)     
Category of Security


Electric and Power...............               39.85%
General Obligation...............               14.08%
Health Care and Hospital.........               29.47%
Water and Sewer..................               16.60%
Original Issue Discount..........               83.40%

                   See:  "The Trust -- Summary Description of the
          Portfolios", in Part B, for a summary of the investment risks
          associated with the type of Securities contained in the Insured
          National Trust.  See:  "Tax Status", in Part B, for a
          discussion of certain tax considerations with regard to
          Original Issue Discount.

                    Of the Original Issue Discount bonds in the Insured
          National Trust, approximately 3.27% of the aggregate principal
          amount of the Securities in the Insured National Trust (or .97%
          of the market value of all Securities in the Insured National
          Trust on June 6, 1997) are zero coupon bonds (including bonds
          known as multiplier bonds, money multiplier bonds, capital
          accumulator bonds, compound interest bonds and discount
          maturity payment bonds).
    
                             A-10
<PAGE>

                             -11-



                    The Securities in the Insured National Trust are
          insured to maturity by the insurance obtained by the Issuers or
          by third parties from the following insurance companies:
          AMBAC:  15.85%; FGIC:  .97% and MBIA:  83.18%.a
                    On June 6, based on the bid side of the market, the
          aggregate market value of the Securities in the Insured
          National Trust was $3,786,154.35.
                    On June 6, 1997, eight of the Securities in the Insured
          National Trust were rated "AAA" by Standard & Poor's
          Corporation because of the Bond Insurance policies issued in
          respect of such Securities.  (See:  the respective "Schedule of
          Portfolio Securities", herein, and "Bond Ratings", in Part B.)
          A Security in the Portfolio may subsequently cease to be rated
          or the rating assigned may be reduced below the minimum
          requirements of the Insured National Trust for the acquisition
          of Securities.  While such events may be considered by the
          Sponsor in determining whether to direct the Trustee to dispose
          of the Security (see:  "Sponsor -- Responsibility", in Part B),
          such events do not automatically require the elimination of
          such Security from the Portfolio.
             
a    Percentages computed on the basis of the aggregate bid
     side evaluation of the Securities in the Insured National
     Trust on June 6, 1997.


                   A-11
<PAGE>
<AUDIT-REPORT>

                        INDEPENDENT AUDITORS' REPORT

THE UNIT HOLDERS, SPONSOR AND TRUSTEE
DEAN WITTER SELECT MUNICIPAL TRUST
INSURED NATIONAL PORTFOLIO SERIES 41


We have audited the statement of financial condition and schedule of 
portfolio securities of the Dean Witter Select Municipal Trust Insured 
National Portfolio Series 41 as of April 30, 1997, and the related 
statements of operations and changes in net assets for each of the three 
years in the period then ended.  These financial statements are the 
responsibility of the Trustee (see Footnote (a)(1)).  Our responsibility is 
to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing 
standards.  Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements are free 
of material misstatement.  An audit includes examining, on a test basis, 
evidence supporting the amounts and disclosures in the financial statements.  
Our procedures included confirmation of the securities owned as of April 30, 
1997 as shown in the statement of financial condition and schedule of 
portfolio securities by correspondence with The Chase Manhattan Bank, the 
Trustee.  An audit also includes assessing the accounting principles used 
and the significant estimates made by the Trustee, as well as evaluating the 
overall financial statement presentation.  We believe that our audits 
provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, 
in all material respects, the financial position of the Dean Witter Select 
Municipal Trust Insured National Portfolio Series 41 as of April 30, 1997, 
and the results of its operations and the changes in its net assets for each 
of the three years in the period then ended in conformity with generally 
accepted accounting principles.




DELOITTE & TOUCHE LLP







June 2, 1997
New York, New York









                                    F-1
</AUDIT-REPORT>




<PAGE>
                       STATEMENT OF FINANCIAL CONDITION
                                       
                      DEAN WITTER SELECT MUNICIPAL TRUST
                     INSURED NATIONAL PORTFOLIO SERIES 41
                                       
                                APRIL 30, 1997


                                TRUST PROPERTY

Investments in municipal bonds at market value (amortized
  cost $3,700,855) (Note (a) and Schedule of Portfolio
  Securities Notes (4) and (5))                                  $3,702,661

Accrued interest receivable                                          62,809

Cash                                                                 16,526

           Total                                                  3,781,996


                          LIABILITIES AND NET ASSETS

Less Liabilities:

   Accrued Trustee's fees and expenses                                6,624

   Accrued Sponsor's fees                                             1,880

           Total liabilities                                          8,504


Net Assets:

   Balance applicable to 3,816 Units of fractional
     undivided interest outstanding (Note (c)):

      Capital, plus net unrealized market
        appreciation of $1,806                       $3,702,661

      Undistributed principal and net investment
        income (Note (b))                                70,831


           Net assets                                            $3,773,492

Net asset value per Unit ($3,773,492 divided by 3,816 Units)     $   988.86




                      See notes to financial statements







                                     F-2


<PAGE>
                           STATEMENTS OF OPERATIONS
                                       
                      DEAN WITTER SELECT MUNICIPAL TRUST
                     INSURED NATIONAL PORTFOLIO SERIES 41



                                               For the years ended April 30,
                                                1997       1996       1995


Investment income - interest                  $230,070   $231,279   $231,178

Less Expenses:

   Trustee's fees and expenses                   7,280      7,319      7,320

   Sponsor's fees                                  995      1,000      1,000

           Total expenses                        8,275      8,319      8,320

           Investment income - net             221,795    222,960    222,858

Net gain on investments:

   Realized loss on securities sold
     or redeemed                                (1,232)      -          -   

   Unrealized market appreciation               61,354    100,601     50,894

           Net gain on investments              60,122    100,601     50,894

Net increase in net assets resulting from 
  operations                                  $281,917   $323,561   $273,752




                      See notes to financial statements




















                                     F-3


<PAGE>
                     STATEMENTS OF CHANGES IN NET ASSETS
                                       
                      DEAN WITTER SELECT MUNICIPAL TRUST
                     INSURED NATIONAL PORTFOLIO SERIES 41



                                            For the years ended April 30,
                                           1997         1996         1995

Operations:

   Investment income - net              $  221,795   $  222,960   $  222,858

   Realized loss on securities sold
     or redeemed                            (1,232)        -            -   

   Unrealized market appreciation           61,354      100,601       50,894

           Net increase in net assets 
             resulting from operations     281,917      323,561      273,752


Less Distributions to Unit Holders:

   Investment income - net                (219,937)    (220,922)    (220,800)

           Total distributions            (219,937)    (220,922)    (220,800)


Less Capital Share Transactions:

   Redemption of 175 Units and
     9 Units, respectively                (171,043)      (8,668)        -   

   Accrued interest on redemption           (3,053)        (172)        -   

            Total capital share
              transactions                (174,096)      (8,840)        -   

Net (decrease) increase in net assets     (112,116)      93,799       52,952

Net assets:

   Beginning of year                     3,885,608    3,791,809    3,738,857

   End of year (including undistributed 
     principal and net investment income 
     of $70,831, and undistributed net
     investment income of $65,406 and 
     $74,012, respectively)             $3,773,492   $3,885,608   $3,791,809




                      See notes to financial statements



                                     F-4


<PAGE>
                       NOTES TO FINANCIAL STATEMENTS
                                      
                     DEAN WITTER SELECT MUNICIPAL TRUST
                    INSURED NATIONAL PORTFOLIO SERIES 41
                                      
                               APRIL 30, 1997



(a) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    The Trust is registered under the Investment Company Act of 1940 as a 
Unit Investment Trust.  The following is a summary of the significant 
accounting policies of the Trust:

(1) Basis of Presentation

    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 Evaluator determines the price for each 
underlying Security included in the Trust's Portfolio of Securities 
on the basis set forth in Part B of this Prospectus, "Public 
Offering of Units - Public Offering Price".  Under the Securities 
Act of 1933 ("the Act"), as amended, the Sponsor is deemed to be an 
issuer of the Trust 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 Trust's Registration 
Statement under the Act and amendments thereto.

(2) Investments

    Investments are stated at market value as determined by the 
Evaluator based on the bid side evaluations on the last day of 
trading during the period, except that value on the date of deposit 
(May 25, 1993) represents the cost of investments to the Trust 
based on the offering side evaluations as of the date prior to the 
date of deposit.

(3) Income Taxes

    The Trust is not an association taxable as a corporation for Federal 
income tax purposes; accordingly, no provision is required for such 
taxes.

(4) Expenses

    The Trust pays annual Trustee's fees, estimated expenses, 
Evaluator's fees, and annual Sponsor's portfolio supervision fees 
and may incur additional charges as explained under "Expenses and 
Charges - Fees" and "- Other Charges" in Part B of this Prospectus.




                                       F-5


<PAGE>
                       NOTES TO FINANCIAL STATEMENTS
                                      
                     DEAN WITTER SELECT MUNICIPAL TRUST
                    INSURED NATIONAL PORTFOLIO SERIES 41
                                      
                               APRIL 30, 1997



(b) DISTRIBUTIONS

    Interest received by the Trust is distributed to the Unit Holders on or 
shortly after the fifteenth day of each month after deducting applicable 
expenses.  Receipts other than interest are distributed as explained in 
"Administration of the Trust - Distribution of Interest and Principal" 
in Part B of this Prospectus.

(c) ORIGINAL COST TO INVESTORS

    The original cost to investors represents the aggregate initial public 
offering price as of the date of deposit (May 25, 1993) exclusive of 
accrued interest, computed on the basis set forth under "Public Offering 
of Units - Public Offering Price" in Part B of this Prospectus.

    A reconciliation of the original cost of Units to investors to the net 
amount applicable to investors as of April 30, 1997 follows:

       Original cost to investors                              $4,074,276
       Less:  Gross underwriting commissions (sales charge)      (199,640)
       Net cost to investors                                    3,874,636
       Cost of Securities sold or redeemed                       (180,807)
       Net unrealized market appreciation                           1,806
       Accumulated interest accretion                               7,026
       Net amount applicable to investors                      $3,702,661

(d) OTHER INFORMATION

    Selected data for a Unit of the Trust during each year:

                                               For the years ended April 30,
                                               1997        1996        1995
       
       Net investment income distributions 
         during year                         $ 55.31     $ 55.31     $ 55.20
       
       Net asset value at end of year        $988.86     $973.59     $947.95
       
       Trust Units outstanding at end 
         of year                               3,816       3,991       4,000
       
       
       
       
       
       
       
       
       
       
                                        F-6


<PAGE>
<TABLE>
<CAPTION>
                                   SCHEDULE OF PORTFOLIO SECURITIES
                                                   
                                  DEAN WITTER SELECT MUNICIPAL TRUST
                                 INSURED NATIONAL PORTFOLIO SERIES 41
                                                   
                                            APRIL 30, 1997
                                                   
                                                   
                                                   
Port-                                                                                                    Optional
folio                              Rating       Face        Coupon    Maturity       Sinking Fund        Refunding        Market
 No.   Title of Securities          <F3>       Amount        Rate        Date       Redemptions<F5>    Redemptions<F4> Value<F6><F7>

<S> <C>                             <C>      <C>             <C>       <C>           <C>                <C>               <C>
  1. District of Columbia 
     (Washington, D.C.) General
     Obligation Refunding Bonds,
     Series 1993B (MBIA Insured)
     <F8>                           AAA      $  500,000      5.500%    06/01/12      06/01/10@100       NONE              $  483,075

  2. Illinois Health Facilities
     Authority Revenue Bonds,
     Series 1992 B (Franciscan
     Sisters Health Care Corpora-
     tion Project) (MBIA Insured)
     <F8>                           AAA         500,000      6.250     09/01/21      09/01/14@100       09/01/02@102         509,060

  3. Illinois Municipal Elec-
     tric Agency, Power Supply
     System Revenue Bonds, Series
     1991A (AMBAC Insured) <F9>     AAA         600,000      5.750     02/01/21      02/01/08@100       02/01/01/102         587,016

  4. Indiana Municipal Power
     Agency Power Supply System
     Revenue Bonds, 1993 Series A
     (MBIA Insured) <F8>            AAA         475,000      5.500     01/01/23      01/01/20@100       01/01/03@100         448,201

  5. Romulus Community Schools,
     Michigan, 1993 Refunding
     Bonds (General Obligation -
     Unlimited Tax) (FGIC
     Insured) <F10>                 AAA         125,000      0.000     05/01/19      NONE               NONE                  34,332

  6. Piedmont Municipal Power
     Agency, South Carolina, 
     Electric Revenue Bonds, 1992
     Refunding Series (MBIA
     Insured) <F8>                  AAA         425,000      6.300     01/01/22      01/01/15@100       01/01/03@102         440,623

  7. Municipality of Metropoli-
     tan Seattle Sewer Revenue
     Bonds, Series W (MBIA
     Insured) <F8>                  AAA         600,000      6.300     01/01/33      01/01/24@100       01/01/03@102         616,770

  8. Wisconsin Health and Edu-
     cational Facilities Author-
     ity, Wheaton Franciscan
     Services Inc. System Revenue
     Bonds, Series 1993 (MBIA
     Insured) <F8>                  AAA         600,000      5.750     08/15/22      08/15/14@100       08/15/03@102         583,584

                                             $3,825,000                                                                   $3,702,661




                                                 See notes to schedule of portfolio securities
                                                                      F-7
</TABLE>


<PAGE>
               NOTES TO SCHEDULE OF PORTFOLIO SECURITIES
                                    
                   DEAN WITTER SELECT MUNICIPAL TRUST
                  INSURED NATIONAL PORTFOLIO SERIES 41
                                    
                             APRIL 30, 1997



[FN]

<F3> All ratings are provided by Standard & Poor's Corporation.  A brief 
description of applicable Security ratings is given under "Bond 
Ratings" in Part B of this Prospectus.

<F4> There is shown under this heading the date on which each issue of 
Securities is redeemable by the operation of optional call 
provisions and the redemption price for that date; unless otherwise 
indicated, each issue continues to be redeemable at declining 
prices thereafter but not below par.  Securities listed as non-
callable, as well as Securities listed as callable, may also be 
redeemable at par under certain circumstances from special 
redemption payments.

<F5> There is shown under this heading the date on which an issue of 
Securities is subject to scheduled sinking fund redemption and the 
redemption price of par.

<F6> The market value of the Securities as of April 30, 1997 was 
determined by the Evaluator on the basis of bid side evaluations 
for the Securities at such date.

<F7> At April, 30, 1997, the net unrealized market appreciation of all 
Securities was comprised of the following:

       Gross unrealized market appreciation             $ 9,057
       
       Gross unrealized market depreciation              (7,251)
       
       Net unrealized market appreciation               $ 1,806

    The amortized cost of the Securities for Federal income tax purposes 
was $3,700,855 at April 30, 1997.

<F8> Insured by Municipal Bond Insurance Association ("MBIA").

<F9> Insured by American Municipal Bond Assurance Corporation ("AMBAC").

<F10> Insured by Financial Guaranty Insurance Company ("FGIC").










                                  F-8



<PAGE>

                             -13-



(MODULE)
     (NAME)    DWSMTPARTB941
     (CIK)     0000840581
     (CCC)     uit*59fl
(/MODULE)
<PAGE>


                             -14-




    CONTENTS OF REGISTRATION STATEMENT


This registration statement comprises the following
documents:

The facing sheet.

The Cross Reference Sheet.

The Prospectus.

The signatures.

Consents of the Evaluator, Independent Auditors and
Standard & Poor's; all other consents were previously
filed.

The following exhibits:

23. 1a.   Consents of Kenny S&P Evaluation Services,
          a division of J.J. Kenny Co., Inc.

    1b.   Consent of Independent Auditors.

    1d.   Consents of Standard & Poor's.
   
27. 1.    Financial Data Schedule of Dean Witter
          Select Municipal Trust, Insured National
          Portfolio Series 41.
    

           FINANCIAL STATEMENTS


1.   Statement of Financial Condition, Statement of Operations
     and Statement of Changes in Net Assets of the Trust, as
     shown in the Prospectus.

<PAGE>

                             -15-




            CONSENT OF COUNSEL

The consent of counsel to the use of its name in the
Prospectus included in this Registration Statement are
contained in its opinion filed as Exhibit EX-5 to this
Registration Statement.

<PAGE>

                             -16-




                SIGNATURES
   
Pursuant to the requirements of the Securities Act of
1933, each of the registrants, Dean Witter Select Municipal
Trust, Insured National Portfolio Series 41, certifies that it
meets all of the requirements for effectiveness of this
Registration Statement pursuant to Rule 485(b) under the
Securities Act of 1933 and has duly caused this Post-Effective
Amendment No. 4 to the Registration Statement to be signed on
their behalf by the undersigned, thereunto duly authorized, all
in The City of New York and State of New York on the 26th day
of June, 1997.

           DEAN WITTER SELECT MUNICIPAL TRUST,
           INSURED NATIONAL PORTFOLIO SERIES 41
           (Registrants)


           By:  DEAN WITTER REYNOLDS INC.
                (Depositor)


                         Thomas Hines          
                         Thomas Hines
                         Authorized Signatory

Pursuant to the requirements of the Securities Act of
1933, this Post-Effective Amendment No. 4 to the Registration
Statement has been signed on behalf of Dean Witter Reynolds
Inc., the Depositor, by the following person in the following
capacities and by the following persons who constitute a
majority of the Depositor's Board of Directors in The City of
New York and State of New York on this 26th day of June, 1997.

<PAGE>

                             -17-




                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
Thomas C. Schneider        Director
William B. Smith           Director


                                         Thomas Hines
                                         Thomas Hines
                                    Attorney-in-facta


               
a    Executed copies of the Powers of Attorney of the Board
     Members listed below 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, Select 10 Industrial Portfolio 97-1, File
     No. 333-16839, 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
     and Registration Statement on Form S-6 for Dean Witter
     Select Equity Trust, Select 10 International Series 95-1,
     File No. 33-56389.    
<PAGE>

                             -18-

<PAGE>

             EXHIBIT INDEX


EXHIBIT NO.     TITLE OF DOCUMENT


23.          1a. Consent of Kenny S&P Evaluation Services, a
                 division of J.J. Kenny Co., Inc.

             1b. Consent of Deloitte & Touche LLP

             1d. Consent of Standard & Poor's

27.          1.  Financial Data Schedule of Dean Witter
                 Select Municipal Trust, Insured National
                 Portfolio Series 41


                             -20-

<PAGE>



<PAGE>

                 Exhibit 23.1a.

<PAGE>

  Letterhead of KENNY S&P EVALUATION SERVICES
  A division of J.J. Kenny Co., Inc.


                                     June 26, 1997

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

  Re:  Dean Witter Select Municipal Trust,
       Insured National Portfolio Series 41


Gentlemen:

       We have examined the post-effective Amendment to the
Registration Statement File No. 33-27810 for the above-captioned
trust.  We hereby acknowledge that Kenny S&P Evaluation Services,
a division of J.J. Kenny Co., Inc. is currently acting as the
evaluator for the trust.  We hereby consent to the use in the
Registration Statement of the references to Kenny S&P Evaluation
Services, a division of J.J. Kenny Co., Inc. as evaluator.

       In addition, we hereby confirm that the ratings
indicated in the Registration Statement for the respective bonds
comprising the trust portfolio are the ratings indicated in our
KENNYBASE database as of the evaluation report.

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

                      Sincerely,



                      Frank A. Ciccotto
                      Frank A. Ciccotto
                      Vice President

<PAGE>
                                                       Exhibit 23.1b.











                      CONSENT OF INDEPENDENT AUDITORS

We consent to the use of our report dated June 2, 1997, accompanying the 
financial statements of the Dean Witter Select Municipal Trust Insured 
National Portfolio Series 41 included herein and to the reference to our 
Firm as experts under the heading "Auditors" in the prospectus which is a 
part of this registration statement.



DELOITTE & TOUCHE LLP






June 26, 1997
New York, New York


<PAGE>


                    Exhibit 23.1d.



     Letterhead of Standard & Poor's Ratings Services
     A Division of The McGraw-Hill Companies, Inc. 

June 26, 1997



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

Re:  Dean Witter Select Municipal Trust,
     Insured National Portfolio Series 41


Gentlemen:

       It is our understanding that you are filing with the
Securities and Exchange Commission a Post Effective Amendment to
the above captioned trust, SEC file number 33-27810.

       Since the portfolio is composed solely of securities
covered by bond insurance policies that insure against default in
the payment of principal and interest on the securities for so
long as they remain outstanding and such policies have been
issued by one or more insurance companies which have been
assigned "AAA" claims paying ability ratings by Standard &
Poor's, we reaffirm the assignment of a "AAA" rating to the units
of the trust and a "AAA" rating to the securities contained in
the trust.

       You have permission to use the name of Standard &
Poor's Ratings Services, a division of The McGraw-Hill Companies,
Inc. and the above-assigned ratings in connection with your
dissemination of information relating to these units, provided
that it is understood that the ratings are not "market" ratings
nor recommendations to buy, hold, or sell the units of the trust
or the securities in the trust.  Further, it should be understood
that the rating on the units does not take into account the
extent to which fund expenses or portfolio asset sales for less
than the fund's purchase price will reduce payment to the unit
holders of the interest and principal  required to be paid on the
portfolio assets.  Standard & Poor's reserves the right to advise
its own clients, subscribers, and the public of the ratings.

<PAGE>

                            -2-

Standard & Poor's relies on the sponsor and its counsel,
accountants, and other experts for the accuracy and completeness
of the information submitted in connection with the ratings.
Standard & Poor's does not independently verify the truth or
accuracy of any such information.

       This letter evidences our consent to the use of the
name of Standard & Poor's Ratings Services, a division of The
McGraw-Hill Companies, Inc. in connection with the rating
assigned to the units in the amendment referred to above.
However, this letter should not be construed as a consent by us,
within the meaning of Section 7 of the Securities Act of 1933, to
the use of the name of Standard & Poor's Ratings Services, a
division of The McGraw-Hill Companies, Inc. in connection with
the ratings assigned to the securities contained in the trust.
You are hereby authorized to file a copy of this letter with the
Securities and Exchange Commission.

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

       We are pleased to have had the opportunity to be of
service to you.  If we can be of further help, please do not
hesitate to call upon us.


                      Sincerely,



                      Sanford B. Bragg
                      Sanford B. Bragg
                      Managing Director

<PAGE>





<TABLE> <S> <C>

<PAGE>

<ARTICLE>                    6

<LEGEND>                     THE SCHEDULE CONTAINS SUMMARY FINANCIAL
                             INFORMATION EXTRACTED FROM THE FINANCIAL
                             STATEMENTS FOR DEAN WITTER SELECT
                             MUNICIPAL TRUST INSURED NATIONAL
                             PORTFOLIO SERIES 41 AND IS QUALIFIED IN
                             ITS ENTIRETY BY REFERENCE TO SUCH
                             FINANCIAL STATEMENTS

<RESTATED>                   

<SERIES>                     

<NAME>                       DEAN WITTER SELECT MUNICIPAL TRUST     
                             INSURED NATIONAL PORTFOLIO SERIES 

<NUMBER>                     41

<MULTIPLIER>                 1

<FISCAL-YEAR-END>            Apr-30-1997

<PERIOD-START>               May-1-1996

<PERIOD-END>                 Apr-30-1997

<PERIOD-TYPE>                YEAR

<INVESTMENTS-AT-COST>        3,700,855 

<INVESTMENTS-AT-VALUE>       3,702,661 

<RECEIVABLES>                62,809 

<ASSETS-OTHER>               16,526 

<OTHER-ITEMS-ASSETS>         0 

<TOTAL-ASSETS>               3,781,996 

<PAYABLE-FOR-SECURITIES>     0 

<SENIOR-LONG-TERM-DEBT>      0 

<OTHER-ITEMS-LIABILITIES>    8,504 

<TOTAL-LIABILITIES>          8,504 

<SENIOR-EQUITY>              0 

<PAID-IN-CAPITAL-COMMON>     3,700,719 

<SHARES-COMMON-STOCK>        3,816 

<SHARES-COMMON-PRIOR>        3,991 

<ACCUMULATED-NII-CURRENT>    70,967 

<OVERDISTRIBUTION-NII>       0 

<ACCUMULATED-NET-GAINS>      0 

<OVERDISTRIBUTION-GAINS>     0 

<ACCUM-APPREC-OR-DEPREC>     1,806 

<NET-ASSETS>                 3,773,492 

<DIVIDEND-INCOME>            0 

<INTEREST-INCOME>            228,159 

<OTHER-INCOME>               1,911 

<EXPENSES-NET>               8,275 

<NET-INVESTMENT-INCOME>      221,795 

<REALIZED-GAINS-CURRENT>     (1,232)

<APPREC-INCREASE-CURRENT>    61,354 

<NET-CHANGE-FROM-OPS>        281,917 

<EQUALIZATION>               0 

<DISTRIBUTIONS-OF-INCOME>    219,937 

<DISTRIBUTIONS-OF-GAINS>     0 

<DISTRIBUTIONS-OTHER>        0 

<NUMBER-OF-SHARES-SOLD>      0 

<NUMBER-OF-SHARES-REDEEMED>  175 

<SHARES-REINVESTED>          0 

<NET-CHANGE-IN-ASSETS>       (112,116)

<ACCUMULATED-NII-PRIOR>      74,073 

<ACCUMULATED-GAINS-PRIOR>    0 

<OVERDISTRIB-NII-PRIOR>      0 

<OVERDIST-NET-GAINS-PRIOR>   0 

<GROSS-ADVISORY-FEES>        0 

<INTEREST-EXPENSE>           0 

<GROSS-EXPENSE>              0 

<AVERAGE-NET-ASSETS>         0 

<PER-SHARE-NAV-BEGIN>        0 

<PER-SHARE-NII>              0 

<PER-SHARE-GAIN-APPREC>      0 

<PER-SHARE-DIVIDEND>         0 

<PER-SHARE-DISTRIBUTIONS>    0 

<RETURNS-OF-CAPITAL>         0 

<PER-SHARE-NAV-END>          0 

<EXPENSE-RATIO>              0 

<AVG-DEBT-OUTSTANDING>       0 

<AVG-DEBT-PER-SHARE>         0 



</TABLE>


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