NATIONAL MUNICIPAL TRUST MULTISTATE SERIES 50
485BPOS, 1997-08-20
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<PAGE>

As filed with the Securities and Exchange Commission on August 20, 1997
                                           Registration No. 33-46203*
==========================================================================
                    SECURITIES AND EXCHANGE COMMISSION
                          WASHINGTON, D.C. 20549
                            ___________________

                    POST-EFFECTIVE AMENDMENTS NO. 5 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: 
                         NATIONAL MUNICIPAL TRUST,
                                Series 148
                           Multistate Series 50


B.    Name of depositor:
                    PRUDENTIAL SECURITIES INCORPORATED

C.    Complete address of depositor's principal executive office: 
                             One Seaport Plaza
                             199  Water Street
                         New York, New York 10292

D.    Name and complete address of agent for service: 
                                                   Copy to: 
       LEE B. SPENCER, JR., ESQ.             KENNETH W. ORCE, ESQ.
   PRUDENTIAL SECURITIES INCORPORATED       CAHILL GORDON & REINDEL
             One Seaport Plaza                  80 Pine Street
             199 Water Street              New York, New York 10005
          New York, New York 10292

It is proposed that this filing will become effective (check appropriate
box.)
 ___
/  / immediately upon filing on (date) pursuant to
      paragraph (b);
 ___
/X / on August 20, 1997 pursuant to paragraph (b);
 ___
/__/ 60 days after filing pursuant to paragraph (a);
 ___
/__/ on (date) pursuant to paragraph (a) of rule 485. 
_______________
*     This Registration Statement combines two Registration Statements
      (File Nos. 33-46203 and 33-46202) pursuant to Rule 429.


<PAGE>
CUSIPS: 63701H839R;63701H847R                                        MAIL CODE A
 
Prospectus--PART A
 
NOTE: PART A of this Prospectus may not be distributed unless accompanied by
Part B.
- --------------------------------------------------------------------------------
                                              NATIONAL MUNICIPAL TRUST
NMT                                           Series 148
                                              Multistate Series 50
- --------------------------------------------------------------------------------
 
The initial public offering of Units in each 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.
 
The objectives of each Trust are the providing of interest income which, in the
opinion of counsel is, under existing law, excludable from gross income for
Federal income tax purposes (except in certain instances depending on the Unit
Holder), through investment in a fixed portfolio consisting primarily of
long-term (or intermediate term) state, municipal and public authority debt
obligations, and the conservation of capital. In addition, in the opinion of
bond counsel to the issuers of the obligations, the interest income on the
obligations held by the underlying unit investment trust composing Multistate
Series 50 designated as the New York Trust (Insured (Intermediate Term)) (the
'New York Trust (Insured (Intermediate Term))' or the 'State Trust') (the
'Trusts' or the 'Trust' or the 'Insured Trust' as the context requires), is
exempt from state and any local income taxes to individual Unit Holders resident
in the State for which the State Trust is named. There is, of course, no
guarantee that the Trusts' objectives will be achieved. The value of the Units
of each Trust will fluctuate with the value of the portfolio of underlying
Securities. Each municipal bond in the Insured Trust is covered by an
irrevocable insurance policy as a result of which the Units of the Insured Trust
were rated 'AAA' by Standard & Poor's Corporation as of the Date of Deposit.
Insurance guaranteeing the scheduled payment of principal of and interest on the
Securities in the New York Trust (Insured (Intermediate Term)) to the maturity
of such Securities has been obtained at the cost of the issuer at the time of
issuance. No representation is made as to the insurers' ability to meet their
commitments. The Securities in Series 148 are not insured. The Securities in the
Trusts are not insured by The Prudential Insurance Company of America. The
Prospectus indicates the extent to which interest income of each Trust is
subject to alternative minimum tax under the Internal Revenue Code of 1986, as
amended. See 'Schedule of Portfolio Securities' and 'Portfolio Summary.'
 
                            Minimum Purchase: 1 Unit
 
PUBLIC OFFERING PRICE of the Units of each Trust is equal to the aggregate bid
side evaluation of the underlying Securities in each Trust's Portfolio divided
by the number of Units outstanding in such Trust, plus a sales charge as set
forth in the table herein. (See Part B--'Public Offering of Units--Volume
Discount.') Units are offered at the Public Offering Price plus accrued
interest. (See Part B--'Public Offering of Units.')
 
- --------------------------------------------------------------------------------
Sponsor:
                                                  Prudential Securities (LOGO)
- --------------------------------------------------------------------------------
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES 
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE 
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS 
A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------
Please read and retain                                  Prospectus dated
this Prospectus for future reference                    August 31, 1997

 
<PAGE>
                            NATIONAL MUNICIPAL TRUST
                                   Series 148
                              Multistate Series 50
- --------------------------------------------------------------------------------
                               TABLE OF CONTENTS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                      Page
<S>                                                                                        <C>       <C>
Summary.................................................................................   Part A      A-i
Summary of Essential Information........................................................              A-iv
Independent Auditors' Report............................................................               A-1
Statement of Financial Condition........................................................               A-2
Schedule of Portfolio Securities........................................................               A-7
The Trust...............................................................................   Part B        1
     Portfolio Summary..................................................................                 2
     Insurance on the Securities in the Portfolio of an Insured Trust--General..........                 9
     Insurance on the Securities in the Portfolio of an Insured Trust--Insurers.........                 9
     Objectives and Securities Selection................................................                14
     Estimated Annual Income Per Unit...................................................                14
Tax Status..............................................................................                15
Public Offering of Units................................................................                18
     Public Offering Price..............................................................                18
     Public Distribution................................................................                19
     Secondary Market...................................................................                20
     Sponsor's and Underwriters' Profits................................................                20
     Secondary Market Sales Charge......................................................                20
     Volume Discount....................................................................                21
     Employee Discount..................................................................                21
Exchange Option.........................................................................                21
     Tax Consequences...................................................................                23
Reinvestment Program....................................................................                23
Expenses and Charges....................................................................                23
     Expenses...........................................................................                23
     Fees...............................................................................                23
     Other Charges......................................................................                25
Rights of Unit Holders..................................................................                25
     Certificates.......................................................................                25
     Distribution of Interest and Principal.............................................                25
     Reports and Records................................................................                27
     Redemption.........................................................................                27
Sponsor.................................................................................                28
     Limitations on Liability...........................................................                29
     Responsibility.....................................................................                30
     Resignation........................................................................                30
Trustee.................................................................................                30
     Limitations on Liability...........................................................                31
     Responsibility.....................................................................                31
     Resignation........................................................................                31
Evaluator...............................................................................                31
     Limitations on Liability...........................................................                31
     Responsibility.....................................................................                31
     Resignation........................................................................                31
Amendment and Termination of the Indenture..............................................                32
     Amendment..........................................................................                32
     Termination........................................................................                32
Legal Opinions..........................................................................                32
Auditors................................................................................                32
Bond Ratings............................................................................                32
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
This Prospectus does not contain all of the information with respect to the
investment company set forth in its registration statement and exhibits relating
thereto which have been filed with the Securities and Exchange Commission,
Washington, D.C. under the Securities Act of 1933 and the Investment Company Act
of 1940, and to which reference is hereby made.
- --------------------------------------------------------------------------------
 
No person is authorized to give any information or to make any representations
with respect to this investment company not contained herein; and any
information or representations 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.
- --------------------------------------------------------------------------------
 
                                    SUMMARY
 
    National Municipal Trust, Series 148 ('National Trust (Uninsured)') and
Multistate Series 50 which consists of one underlying unit investment trust
designated as the New York Trust (Insured (Intermediate Term)) (the 'New York
Trust (Insured (Intermediate Term))' or the 'State Trust') (the 'Trusts' or the
'Trust' or the 'Insured Trust' as the context requires) are composed of
interest-bearing municipal bonds (the 'Securities'). The Securities in the State
Trust are issued primarily by or on behalf of the State for which the State
Trust is named and counties, municipalities, authorities and political
subdivisions thereof. The interest on these bonds, in the opinion of bond
counsel to the issuing governmental authorities is, under existing law,
excludable from gross income for Federal income tax purposes (except in certain
instances depending on the Unit Holder) and, as respects the underlying State
Trust, exempt from State and any local income taxes to individual Unit Holders
resident in the State for which the State Trust is named.
 
    INSURANCE guaranteeing the scheduled payments of principal of and interest
on the Securities in the portfolio of the Insured Trust has been obtained by the
issuer at the cost of the issuer at the time of issuance of the Securities from
AMBAC Indemnity Corporation ('AMBAC'), Capital Guaranty Insurance Company
('CGIC'), Financial Security Assurance ('FSA'), Municipal Bond Insurance
Association ('MBIA'), Municipal Bond Investors Assurance Corporation ('MBIAC'),
and/or Financial Guaranty Insurance Company ('Financial Guaranty' or 'FGIC')
(singularly, each an 'Insurance Company' and, collectively, the 'Insurance
Companies'). (See Part B--'The Trust--Insurance on the Securities in the
Portfolio of an Insured Trust'). As a result of the insurance, the Securities
and the Units of the Insured Trust have received a rating of 'AAA' by Standard &
Poor's Corporation. There can be no assurance that Units of the Insured Trust
will retain this 'AAA' rating. There is, of course, no guarantee that the
objectives of the Insured Trust will be achieved since an issuer may be unable
to meet its principal and interest payment obligations and, in such event, the
Insurance Company involved may be unable to satisfy its insurance obligation.
Insurance is not a substitute for the basic credit of an issuer, but supplements
the issuer's existing credit and provides additional security therefor. NO
REPRESENTATION IS MADE AS TO THE ABILITY OF THE INSURANCE COMPANIES TO MEET
THEIR COMMITMENTS.
 
    MONTHLY DISTRIBUTIONS of principal, premium, if any, and interest received
by each Trust will be made on or shortly after the twenty-fifth day of each
month to Unit Holders of record as of the immediately preceding Record Date.
(See Part B--'Rights of Unit Holders--Distribution of Interest and Principal.')
Alternatively, Unit Holders may elect to have their distributions reinvested in
the Reinvestment Program of the Sponsor, as, if and when such program is
available to Unit Holders. (See Part B--'Reinvestment Program.')
 
    THE SPONSOR, although not obligated to do so, presently intends to maintain
a secondary market for the Units in each Trust based on the aggregate bid side
evaluation of the underlying Securities, as more fully described under Part
B--'Public Offering of Units--Secondary Market--Public Offering Price.' If such
a market is not maintained, a Unit Holder may be able to dispose of his Units
only through redemption at prices based on the aggregate bid side evaluation of
the underlying Securities. (See Part B--'Rights of Unit
Holders--Redemption--Computation of Redemption Price per Unit.')
 
    SPECIAL CONSIDERATIONS. An investment in Units of each 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. Insurance
obtained by the Security issuer does not guarantee the market value of the
Securities or the value of the Units. Any such insurance obtained by the issuer
may be considered to represent an element of market value in regard to the
Securities thus insured. The insurance on the Securities in the New York Trust
(Insured (Intermediate Term)) does not protect Unit Holders from the risk that
the
                                      A-i
 
<PAGE>
value of the units may decline. (See Part B--'The Trust--Portfolio Summary.')
The ratings of the Securities set forth in Part A--'Schedule of Portfolio
Securities' may have declined due to, among other factors (including a decline
in the creditworthiness of an insurer in the case of an insured trust which may
also result in a decline in the 'AAA' rating of the units of an insured trust),
a decline in creditworthiness of the issuer of said Securities.
 
    Note: In Part B 'Rights of Unit Holders--Distribution of Interest and
Principal,' the Minimum Principal Distribution Amount is amended to read $1.00
per Unit.
 
    Note: The seventh paragraph on page B-7 in Part B is amended to delete such
paragraph and replace it with the following:
 
    The Puerto Rican economy is affected by a number of Commonwealth and Federal
investment incentive programs. For example, prior to 1996, Section 936 of the
Internal Revenue Code generally provided deferral of Federal income taxes for
U.S. companies operating on the island until profits are repatriated. Section
936 was repealed by the Small Business Job Protection Act of 1996. It is
expected that the repeal of Section 936 will have a strongly negative impact on
Puerto Rico's economy.
 
    Note: The second paragraph in Part B 'Sponsor' is amended to delete such
paragraph and replace it with the following:
 
    Prudential Securities is distributor for series of Prudential Government
Securities Trust, The BlackRock Government Income Trust, Command Government
Fund, Command Money Fund, Command Tax-Free Fund, Global Utility Fund, Inc.,
Nicholas-Applegate Fund, Inc., Prudential Allocation Fund, Prudential California
Municipal Fund, Prudential Distressed Securities Fund, Inc., Prudential
Diversified Bond Fund, Inc., Prudential Dryden Fund, Prudential Emerging Growth
Fund, Inc., Prudential Equity Fund, Inc., Prudential Equity Income Fund,
Prudential Europe Growth Fund, Inc., Prudential Global Genesis Fund, Inc., The
Global Government Plus Fund, Inc., Prudential Global Limited Maturity Fund,
Inc., Prudential Global Natural Resources Fund, Inc., The Global Total Return
Fund, Inc., Prudential Government Income Fund, Prudential High Yield Fund, Inc.,
Prudential Institutional Liquidity Portfolio, Inc., Prudential Intermediate
Global Income Fund, Inc., Prudential Jennison Series Fund, Inc., Prudential
MoneyMart Assets, Inc., Prudential Mortgage Income Fund, Inc., Prudential
Multi-Sector Fund, Inc., Prudential Municipal Bond Fund, Prudential Municipal
Series Fund, Prudential National Municipals Fund, Inc., Prudential Pacific
Growth Fund, Inc., Prudential Small Companies Fund, Inc., Prudential Special
Money Market Fund, Inc., Prudential Structured Maturity Fund, Inc., Prudential
Tax-Free Money Fund, Inc., Prudential Utility Fund, Inc. and Prudential World
Fund, Inc.
 
    Note: In Part B 'Trustee' the location of the unit investment trust office
of The Chase Manhattan Bank is amended to read 4 New York Plaza, New York, New
York 10004.
 
Portfolio Summary
 
   National Trust (Uninsured)
 
    The Portfolio contains 14 issues of Securities of issuers located in 10
states and two in Puerto Rico. One of the issues (1.8%* of the Trust) is a
general obligation of a governmental entity and is backed by the general taxing
powers of that entity. The remaining issues are payable from the income of
specific projects or authorities and are not supported by the issuer's power to
levy taxes. Although income to pay such Securities may be derived from more than
one source, the primary sources of such income and the percentage of issues
deriving income from such sources are as follows: airport facilities: 13.9%* of
the Trust; education facilities: 6.1%* of the Trust; health and hospital
facilities: 37.4%* of the Trust; housing facilities: 26.9%* of the Trust;
utility facilities: 7.2%* of the Trust; special tax bonds: 6.7%* of the Trust.
The Trust is concentrated in health and hospital facilities Securities and
housing facilities Securities.
 
    The Portfolio also contains Securities representing 21.1%* of the Trust
(single-family housing securities) which are subject to the requirements of
Section 103A of the Internal Revenue Code of 1954, as amended, or Section 143 of
the Internal Revenue Code of 1986.
 
    Approximately 21.1%* of the Securities in the Trust also contain provisions
which require the issuer to redeem such obligations at par from unused proceeds
of the issue within a stated period which typically does not exceed three years
from the date of issuance of such Securities.
 
- ------------
    * Percentages computed on the basis of the aggregate bid price of the
Securities in the Trust on July 23, 1997.
 
                                      A-ii
 
<PAGE>
    51.3%* of the Securities in the Trust are rated by Standard & Poor's
Corporation (16.4%* being rated AAA, 14.2%* being rated AA, 7.9%* being rated A
and 12.8%* being rated BBB) and 48.7%* of the Securities in the Trust are rated
by Moody's Investors Service (6.7%* being rated Aaa, 12.9%* being rated Aa,
15.2%* being rated A and 13.9% being rated Baa). For a description of the
meaning of the applicable rating symbols as published by Standard & Poor's and
Moody's, see Part B--'Bond Ratings.' It should be emphasized, however, that the
ratings of Standard & Poor's and Moody's represent their opinions as to the
quality of the Securities which they undertake to rate and that these ratings
are general and are not absolute standards of quality.
 
    Seven Securities in the Trust have been issued with an 'original issue
discount.' (See Part B--'Tax Status.')
 
    Of these original issue discount bonds, approximately 9.1% of the aggregate
principal amount of the Securities in the Trust (although only 3.1%* of the
aggregate bid price of all Securities in the Trust) are zero coupon bonds
(including bonds known as multiplier bonds, money multiplier bonds, capital
appreciation bonds, capital accumulator bonds, compound interest bonds, and
discount maturity payment bonds).
 
   Alternative Minimum Tax
 
    As of the date of the Summary of Essential Information, the Sponsor's
affiliate, The Prudential Investment Corporation, estimates that 39.1% of the
estimated annual income per Unit consists of interest on private activity bonds,
which interest is to be treated as a tax preference item for alternative minimum
tax purposes (See 'Tax Status' and 'Schedule of Portfolio Securities').
 
    The Sponsor participated as sole underwriter or manager or member of
underwriting syndicates from which approximately 7.8%* of the Trust was
acquired.
 
   New York Trust (Insured (Intermediate Term))
 
    The Portfolio contains 10 issues of Securities of issuers located in the
State of New York. Four of the issues (37.2%* of the Trust) are general
obligations of governmental entities and are backed by the general taxing powers
of those entities. The remaining issues are payable from the income of specific
projects or authorities and are not supported by the issuer's power to levy
taxes. Although income to pay such Securities may be derived from more than one
source, the primary sources of such income and the percentage of issues deriving
income from such sources are as follows: lease facilities: 23.9%* of the Trust;
transportation facilities: 38.9%* of the Trust. The Trust is concentrated in
general obligations and transportation facilities Securities.
 
    100%* of the Securities in the Trust are rated AAA by Standard & Poor's
Corporation. For a description of the meaning of the applicable rating symbols
as published by Standard & Poor's see Part B--'Bond Ratings'. It should be
emphasized, however, that the ratings of Standard & Poor's represent its opinion
as to the quality of the Securities which it undertakes to rate and that these
ratings are general and are not absolute standards of quality.
 
    Five Securities in the Trust have been issued with an 'original issue
discount.' (See Part B--'Tax Status.')
 
    Of these original issue discount bonds, approximately 6.0% of the aggregate
principal amount of the Securities in the Trust (although only 4.4%* of the
aggregate bid price of all Securities in the Trust) are zero coupon bonds
(including bonds known as multiplier bonds, money multiplier bonds, capital
appreciation bonds, capital accumulator bonds, compound interest bonds, and
discount maturity payment bonds).
 
    The Securities in the Trust are insured to maturity by the insurance
obtained by the issuer from the following insurance companies: FGIC: 15.3%*;
FSA: 10.5%*; MBIA: 74.2%*.
 
   Alternative Minimum Tax
 
    As of the date of the Summary of Essential Information, the Sponsor's
affiliate, The Prudential Investment Corporation, estimates that 12.0% of the
estimated net annual income per Unit consists of interest on private activity
bonds, which interest is to be treated as a tax preference item for alternative
minimum tax purposes (see 'Tax Status' and 'Schedule of Portfolio Securities').
 
    The Sponsor participated as sole underwriter or manager or member of
underwriting syndicates from which approximately 21.4%* of the Trust was
acquired.
- ------------
    * Percentages computed on the basis of the aggregate bid price of the
Securities in the Trust on July 23, 1997.
 
                                     A-iii
 
<PAGE>
                        SUMMARY OF ESSENTIAL INFORMATION
 
                            NATIONAL MUNICIPAL TRUST
                                   SERIES 148
                                  (UNINSURED)
                              As of July 23, 1997
 
<TABLE>
<S>                                                 <C>
FACE AMOUNT OF SECURITIES.......................... $9,190,000.00
NUMBER OF UNITS....................................      9,944.00
FRACTIONAL UNDIVIDED INTEREST IN THE TRUST
  REPRESENTED BY EACH UNIT.........................     1/9,944th
PUBLIC OFFERING PRICE
  Aggregate bid side evaluation of Securities in
    the Trust...................................... $9,363,769.43
  Divided by 9,944 Units........................... $      941.65
  Plus sales charge of 4.743% of Public Offering
    Price (4.979% of net amount invested in
    Securities).................................... $       46.88
                                                    -------------
  Public Offering Price per Unit(2)(4)............. $      988.53
                                                    -------------
                                                    -------------
REDEMPTION PRICE AND SPONSOR'S REPURCHASE PRICE PER
  UNIT (based on bid side evaluation of underlying
  Securities, $46.88 less than Public Offering
  Price per Unit)(4)............................... $      941.65
                                                    -------------
                                                    -------------
MINIMUM PRINCIPAL DISTRIBUTION: No distribution need be made from
  the Principal Account if the balance therein is less than $1
  per Unit.
SPONSOR'S ANNUAL PORTFOLIO SUPERVISION FEE: Maximum $.25 per
  $1,000 face amount of underlying Securities.
 
PREMIUM AND DISCOUNT ISSUES IN PORTFOLIO:
  Face amount of Securities with bid side evaluation:
  over par--90.8%; at par--0%; at a discount from par--9.2%
EVALUATOR'S FEE FOR EACH EVALUATION: Maximum of $14.
EVALUATION TIME: 3:30 P.M. New York time
MANDATORY TERMINATION DATE: The Trust must be terminated no later
  than one year after the maturity date of the latest maturing
  Security listed under the Trust's Schedule of Portfolio
  Securities.
MINIMUM VALUE OF TRUST: The Trust may be terminated if the value
  of the Trust is less than $4,000,000.
Percentage of Unit Holders required to consent in order to amend
  (as permitted) the Trust Indenture and Agreement (except under
  certain circumstances when Unit Holder consent is not
  required).................................................. 51%
Percentage of Unit Holders required to consent in order to
  terminate the Trust........................................ 51%
DATE OF DEPOSIT: May 5, 1992(1)
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                    Monthly
                                                                                                    -------
<S>                                                                                                 <C>
CALCULATION OF ESTIMATED NET ANNUAL INCOME PER UNIT
  Estimated Annual Income per Unit...............................................................   $63.39
  Less estimated annual expenses per Unit(3).....................................................    (1.58)
                                                                                                    -------
  Estimated Net Annual Income per Unit...........................................................   $61.81
                                                                                                    -------
                                                                                                    -------
Trustee's Annual Fee per $1,000 principal amount of underlying Securities........................   $ 1.05
Daily Rate of Income Accrual per Unit............................................................   $.1717
Estimated Current Return (based on Public Offering Price)(5)(6)..................................     6.25%
Estimated Long-Term Return(6)....................................................................    4.089%
INTEREST DISTRIBUTION
  Estimated Net Annual Income per Unit / 12......................................................   $ 5.15
Record Dates--Monthly: tenth day of each month
Distribution Dates--Monthly: twenty-fifth day of each month
</TABLE>
- ------------
    (1) The Date of Deposit is the date on which the Indenture was signed and
the deposit of Securities with the Trustee was made.
    (2) This Public Offering Price is computed as of July 23, 1997 and may vary
from the Public Offering Price on the date of this Prospectus or any subsequent
date.
    (3) Includes Trustee's fee, Sponsor's Portfolio supervision fee, estimated
expenses and Evaluator's fees.
    (4) Exclusive of accrued interest which to July 28, 1997, the expected date
of settlement for the purchase of Units on July 23, 1997 was $16.54.
    (5) The estimated current return is increased for transactions entitled to a
reduced sales charge. (See Part B--'The Trust'--'Estimated Annual Income and
Current Return per Unit.')
    (6) The Estimated Current Return is calculated by dividing the Estimated Net
Annual Income per Unit by the Public Offering Price per Unit. The Estimated Net
Annual Income per Unit will vary with changes in fees and expenses of the
Trustee and the Evaluator and with the principal prepayment, redemption,
maturity, exchange or sale of Securities while the Public Offering Price will
vary with changes in the bid price of the underlying Securities; therefore,
there is no assurance that the present Estimated Current Return indicated above
will be realized in the future. The Estimated Long-Term Return is calculated on
a pre-tax basis using a formula which takes into consideration, and factors in
the relative weightings of, the market values, yields (which takes into account
the amortization of premiums and the accretion of discounts) and estimated
retirements of all of the Securities in the Trust and takes into account the
expenses and sales charge associated with each Unit. Since the market values and
estimated retirements of the Securities and the expenses of the Trust will
change, there is no assurance that the present Estimated Long-Term Return as
indicated above will be realized in the future. The after-tax Estimated
Long-Term Return will be lower to the extent of any taxation on the disposition
of Securities. The Estimated Current Return and Estimated Long-Term Return are
expected to differ because the calculation of the Estimated Long-Term Return
reflects the estimated date and amount of principal returned while the Estimated
Current Return calculations include only Net Annual Interest Income and Public
Offering Price as of the above indicated calculation date of the Summary of
Essential Information.
                                      A-iv
 
<PAGE>
                        SUMMARY OF ESSENTIAL INFORMATION
                            NATIONAL MUNICIPAL TRUST
                              MULTISTATE SERIES 50
                                 NEW YORK TRUST
                         (INSURED (INTERMEDIATE TERM))
                              As of July 23, 1997
                   STANDARD & POOR'S CORPORATION RATING: AAA
 
<TABLE>
<S>                                                 <C>
FACE AMOUNT OF SECURITIES.......................... $4,280,000.00
NUMBER OF UNITS....................................      4,294.00
FRACTIONAL UNDIVIDED INTEREST IN THE TRUST
  REPRESENTED BY EACH UNIT.........................     1/4,294th
PUBLIC OFFERING PRICE
  Aggregate bid side evaluation of Securities in
    the Trust...................................... $4,549,751.85
  Divided by 4,294 Units........................... $    1,059.56
  Plus sales charge of 3.075% of Public Offering
    Price (3.173% of net amount invested in
    Securities).................................... $       33.62
                                                    -------------
  Public Offering Price per Unit(2)(4)............. $    1,093.18
                                                    -------------
                                                    -------------
REDEMPTION PRICE AND SPONSOR'S REPURCHASE PRICE PER
  UNIT (based on bid side evaluation of underlying
  Securities, $33.61 less than Public Offering
  Price per Unit)(4)............................... $    1,059.56
                                                    -------------
                                                    -------------
MINIMUM PRINCIPAL DISTRIBUTION: No distribution need be made from
  the Principal Account if the balance therein is less than $1
  per Unit.
SPONSOR'S ANNUAL PORTFOLIO SUPERVISION FEE: Maximum $.05 per
  $1,000 face amount of underlying Securities.
 
PREMIUM AND DISCOUNT ISSUES IN PORTFOLIO:
  Face amount of Securities with bid side evaluation:
  over par--94.0%; at par--0%; at a discount from par--6.0%
EVALUATOR'S FEE FOR EACH EVALUATION: Maximum of $14.
EVALUATION TIME: 3:30 P.M. New York time
MANDATORY TERMINATION DATE: The Trust must be terminated no later
  than one year after the maturity date of the latest maturing
  Security listed under the Trust's Schedule of Portfolio
  Securities.
MINIMUM VALUE OF TRUST: The Trust may be terminated if the value
  of the Trust is less than $1,824,000.
Percentage of Unit Holders required to consent in order to amend
  (as permitted) the Trust Indenture and Agreement (except under
  certain circumstances when Unit Holder consent is not
  required).................................................. 51%
Percentage of Unit Holders required to consent in order to
  terminate the Trust........................................ 51%
DATE OF DEPOSIT: May 5, 1992(1)
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                    Monthly
                                                                                                    -------
<S>                                                                                                 <C>
CALCULATION OF ESTIMATED NET ANNUAL INCOME PER UNIT
  Estimated Annual Income per Unit...............................................................   $60.05
  Less estimated annual expenses per Unit(3).....................................................    (1.69)
                                                                                                    -------
  Estimated Net Annual Income per Unit...........................................................   $58.36
                                                                                                    -------
                                                                                                    -------
Trustee's Annual Fee per $1,000 principal amount of underlying Securities........................   $ 1.05
Daily Rate of Income Accrual per Unit............................................................   $.1621
Estimated Current Return (based on Public Offering Price)(5)(6)..................................     5.34%
Estimated Long-Term Return(6)....................................................................    3.270%
INTEREST DISTRIBUTION
  Estimated Net Annual Income per Unit / 12......................................................     4.86
Record Dates--Monthly: tenth day of each month
Distribution Dates--Monthly: twenty-fifth day of each month
</TABLE>
 
- ------------
    (1) The Date of Deposit is the date on which the Indenture was signed and
the deposit of Securities with the Trustee was made.
    (2) This Public Offering Price is computed as of July 23, 1997 and may vary
from the Public Offering Price on the date of this Prospectus or any subsequent
date.
    (3) Includes Trustee's fee, Sponsor's Portfolio supervision fee, estimated
expenses and Evaluator's fees.
    (4) Exclusive of accrued interest which to July 28, 1997, the expected date
of settlement for the purchase of Units on July 23, 1997 was $15.96.
    (5) The estimated current return is increased for transactions entitled to a
reduced sales charge. (See Part B--'The Trust'--'Estimated Annual Income and
Current Return per Unit.')
    (6) The Estimated Current Return is calculated by dividing the Estimated Net
Annual Income per Unit by the Public Offering Price per Unit. The Estimated Net
Annual Income per Unit will vary with changes in fees and expenses of the
Trustee and the Evaluator and with the principal prepayment, redemption,
maturity, exchange or sale of Securities while the Public Offering Price will
vary with changes in the bid price of the underlying Securities; therefore,
there is no assurance that the present Estimated Current Return indicated above
will be realized in the future. The Estimated Long-Term Return is calculated on
a pre-tax basis using a formula which takes into consideration, and factors in
the relative weightings of, the market values, yields (which takes into account
the amortization of premiums and the accretion of discounts) and estimated
retirements of all of the Securities in the Trust and takes into account the
expenses and sales charge associated with each Unit. Since the market values and
estimated retirements of the Securities and the expenses of the Trust will
change, there is no assurance that the present Estimated Long-Term Return as
indicated above will be realized in the future. The after-tax Estimated
Long-Term Return will be lower to the extent of any taxation on the disposition
of Securities. The Estimated Current Return and Estimated Long-Term Return are
expected to differ because the calculation of the Estimated Long-Term Return
reflects the estimated date and amount of principal returned while the Estimated
Current Return calculations include only Net Annual Interest Income and Public
Offering Price as of the above indicated calculation date of the Summary of
Essential Information.
                                      A-v
 
<PAGE>
Risk Factors
 
    Potential purchasers of the Units of the New York Trust should consider the
fact that the New York Trust's portfolio consists primarily of securities issued
by the State of New York (the 'State') or its municipalities or authorities and
realize the substantial risks associated with an investment in such securities.
 
    The Sponsor believes the information summarized below describes some of the
more significant aspects of the New York Trust. The sources of such information
are the official statements of issuers. While the Sponsor has not independently
verified this information, it has no reason to believe that such information is
not correct in all material respects.
 
   New York State
 
    The 1996-97 Executive Budget proposes $3.9 billion in actions to balance the
1996-97 Financial Plan. Before reflecting any actions proposed by the Governor
to restrain spending, General Fund disbursements for 1996-97 were projected at
$35 billion, an increase of $2.3 billion or 7 percent from 1995-96. This
increase would have resulted from growth in Medicaid, inflationary increases in
school aid, higher fixed costs such as pensions and debt service, collective
bargaining agreements, inflation, and the loss of non-recurring resources that
offset spending in 1995-96. Receipts would have been expected to fall by $1.6
billion. This reduction would have been attributable to modest growth in the
State's economy and underlying tax base, the loss of non-recurring revenues
available in 1995-96 and implementation of previously enacted tax reduction
programs.
 
    In recent years, State actions affecting the level of receipts and
disbursements, as well as the relative strength of the State and regional
economy, actions of the Federal government and other factors, have created
structural budget gaps for the State. These gaps resulted from a significant
disparity between recurring revenues and the cost of maintaining or increasing
the level of support for State programs. The 1995-96 enacted budget combines
significant tax and program reductions which will, in the current and future
years, lower both the recurring receipts base (before the effect of any economic
stimulus from such tax reductions) and the historical annual growth in state
program spending. Notwithstanding these changes, the State can expect to
continue to confront structural deficits in future years.
 
    The 1995-96 State Financial Plan includes actions that will have an effect
on the budget outlook for State fiscal year 1996-97 and beyond. The net amount
of nonrecurring resources used in the 1995-96 State Financial Plan is estimated
by the Division of the Budget at over $600 million. In addition to this use of
nonrecurring resources, the 1995-96 State Financial Plan reflects actions that
will directly affect the State's 1996-97 fiscal year baseline receipts and
disbursements. The three-year plan to reduce State personal income taxes will
decrease State tax receipts by an estimated $1.7 billion in State fiscal year
1996-97, in addition to the amount of reduction in State fiscal year 1995-96.
Further significant reductions in the personal income tax are scheduled for the
1997-98 State fiscal year. Other tax reductions enacted in 1994 and 1995 are
estimated to cause an additional reduction in receipts of over $500 million in
1996-97, as compared to the level of receipts in 1995-96. Similarly, many
actions taken to reduce disbursements in the State's 1995-96 fiscal year are
expected to provide greater reductions in State fiscal year 1996-97. These
include actions to reduce the State work force, reduce Medicaid and welfare
expenditures and slow community mental hygiene program development.
 
    The net impact of these and other factors is expected to produce a potential
imbalance in receipts and disbursements in State fiscal year 1996-97. The
Governor has indicated that in the 1996-97 Executive Budget he will propose to
close this potential imbalance primarily through General Fund expenditure
reductions and without increases in taxes or deferrals of scheduled tax
reductions.
 
    To address a potential imbalance in any given fiscal year, the State would
be required to take actions to increase receipts and/or reduce disbursements as
it enacts the budget for that year, and under the State Constitution, the
Governor is required to propose a balanced budget each year. To correct
recurring budgetary imbalances, the State would need to take significant actions
to align recurring receipts and disbursements in future fiscal years. There can
be no assurance, however that the Legislature will enact the Governor's
proposals or that the State's actions will be sufficient to preserve budgetary
balance in a given fiscal year or to align recurring receipts and disbursements
in future fiscal years.
 
    The State is a defendant in numerous legal proceedings and the monetary
damages sought are substantial. These proceedings could affect adversely the
financial condition of the State in the 1995-96 fiscal year or thereafter.
 
    The economic and financial condition of the State may be affected by various
financial, social, economic and political factors. Those factors can be very
complex, can vary from fiscal year to fiscal year, and are frequently the result
of actions taken not only by the State but also by entities, such as the federal
government, that are outside the State's control.
 
                                      A-vi
 
<PAGE>
Because of the uncertainty and unpredictability of changes in these factors,
their impact cannot be fully included in the assumptions underlying the State's
projections. There can be no assurance that the State economy will not
experience results that are worse than predicted, with corresponding material
and adverse effects on the State's financial projections.
 
    From time to time, Federal expenditure reductions could reduce, or in some
cases eliminate, Federal funding of some local programs and accordingly might
impose substantial increased expenditure requirements on affected localities. If
the State, the City or any of the public authorities were to suffer serious
financial difficulties jeopardizing their respective access to the public credit
markets, the marketability of notes and bonds issued by localities within the
State could be adversely affected. Localities also face anticipated and
potential problems resulting from certain pending litigation, judicial decisions
and long-range economic trends. Long-range potential problems of declining urban
population, increasing expenditures and other economic trends could adversely
affect localities and require increasing State assistance in the future.
 
   New York City
 
    The fiscal health of the State is closely related to the fiscal health of
its localities, particularly The City of New York (the 'City'), which has
required and continues to require significant financial assistance from the
State which financial assistance could be affected by State revenue short-falls
or spending increases beyond its projections. For each of its 1981 through 1995
fiscal years, the City, as required by State law, achieved balanced operating
results, in accordance with GAAP.
 
    The New York State Financial Emergency Act for The City of New York (the
'Financial Emergency Act'), among other things, established the New York State
Financial Control Board (the 'Control Board') to oversee the City's financial
affairs. The City operates under a four-year financial plan which is prepared
annually and is updated quarterly. The City submits its financial plans as well
as the updates quarterly to the Control Board for its review. The Municipal
Assistance Corporation for The City of New York ('MAC') and the Office of the
State Deputy Comptroller for The City of New York ('OSDC') assist the Control
Board in exercising its powers and responsibilities and exercise various
monitoring functions relating to the City's financial position.
 
    During recent fiscal years, as a result of the slowing economy, the City
experienced significant shortfalls from earlier projections in almost all of its
major tax sources, and was required to take exceptional measures to close
substantial budget gaps in order to maintain balanced budgets. There can be no
assurance that the City will continue to maintain a balanced budget as required
by State law without additional tax or other revenue increases or additional
reductions in City services or entitlement programs, which could adversely
affect the City's economic base. The City's Financial Plan for the 1996-99
fiscal years sets forth actions to close a projected budget gap of $3.1 billion
for the 1996 fiscal year. The Financial Plan also outlines projected budget gaps
of $2.0 billion, $3.3 billion and $4.1 billion for the 1997 through 1999 fiscal
years, respectively.
 
    As of June 30, 1995, the City estimated that its potential future liability
on account of outstanding claims against it amounted to approximately $2.5
billion and while the outcome of the proceedings and claims are not currently
predictable, adverse determinations in certain of them might have a material
adverse effect upon the City's ability to carry out the 1996-1999 Financial
Plan.
 
    On July 10, 1995, Standard and Poor's revised its rating of City bonds
downward to 'BBB+' and continued its negative rating outlook assessment. In
February 1991, Moody's Investors Service lowered its rating on the City's
general obligation bonds from 'A' to 'Baa1.'
 
    Over the long term, serious potential economic problems may continue to
aggravate State and local financial conditions. For decades, the State economy
has grown more slowly than the nation as a whole, resulting in the gradual
erosion of the State's relative economic affluence and tax base, and the
relocation of certain manufacturing operations and executive offices outside the
State. The causes of this relative decline are varied and complex, in many cases
involving national and international developments beyond the State's control.
Part of the reason for the long-term relative decline in the State economy has
been attributed to the combined state and local tax burden, which is among the
highest in the nation. The existence of this tax burden limits the State's
ability to impose higher taxes in the event of future financial difficulties.
 
    If during the existence of the New York Trust, the City, the State, or any
of its agencies or municipalities, because of its or their own financial
difficulties, become unable to meet regular commitments or if there should be a
default, moratorium or other interruption of payments of interest or principal
on any obligation issued by the City, the State, or a
 
                                     A-vii
 
<PAGE>
municipality or other authority in New York State, the market value and
marketability of Bonds in the New York Trust, the asset value of Units of the
New York Trust and the interest income to the New York Trust, could be adversely
affected.
 
   New York Tax Status
 
    In the opinion of Messrs. Cahill Gordon & Reindel, special New York counsel
on New York tax matters, as of the date of this Prospectus, under existing law:
 
        Interest on the underlying debt obligations which is exempt from tax
    under the laws of the State and City of New York when received by the New
    York Trust will retain its status as tax-exempt interest to its Unit
    Holders. (Interest on the underlying obligations in the New York Trust is,
    however, not excludable from income in determining the amount of the
    income-based (i) New York State franchise taxes on business and financial
    corporations or (ii) the New York City general corporation tax and the New
    York City financial corporation tax.) The minimum income taxes imposed by
    New York State and New York City on individuals, estates and trusts exclude
    from their taxable bases the Federal tax preference item with respect to
    tax-exempt interest.
 
        Non-residents of New York City will not be subject to the City personal
    income tax on gains derived with respect to their Units. Non-residents of
    the State will not be subject to New York State personal income tax on such
    gains unless the Units are employed in a business, trade or occupation
    carried on in New York State. A New York State or City resident should
    determine his basis and holding period for his Units in the same manner for
    New York State and City personal income tax purposes as for Federal income
    tax purposes.
                                     A-viii


<PAGE>
<AUDIT-REPORT>


                        INDEPENDENT AUDITORS' REPORT

THE UNIT HOLDERS, SPONSOR AND TRUSTEE
NATIONAL MUNICIPAL TRUST
SERIES 148 (Uninsured)
MULTISTATE SERIES 50
  consisting of:
    New York Trust (Insured (Intermediate Term))

We have audited the statements of financial condition and schedules of 
portfolio securities of the National Municipal Trust, Series 148 (Uninsured) 
and Multistate Series 50 consisting of the New York Trust (Insured 
(Intermediate Term)) 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 statements of financial condition and schedules 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 National Municipal 
Trust, Series 148 (Uninsured) and Multistate Series 50 consisting of the New 
York Trust (Insured (Intermediate Term)) as of April 30, 1997, and the 
results of their operations and the changes in their net assets for each of 
the three years in the period then ended in conformity with generally 
accepted accounting principles.

DELOITTE & TOUCHE LLP
DELOITTE & TOUCHE LLP

July 15, 1997
New York, New York

</AUDIT-REPORT>
                                    A-1


<PAGE>
                             STATEMENT OF FINANCIAL CONDITION
                                             
                                 NATIONAL MUNICIPAL TRUST
                                        SERIES 148
                                       (UNINSURED)
                                             
                                      April 30, 1997

                                      TRUST PROPERTY

<TABLE>
<S>                                                                         <C>
Investments in municipal bonds at market value (amortized
  cost $8,921,518) (Note (a) and Schedule of Portfolio 
  Securities Notes (4) and (5))                                             $9,258,847

Accrued interest receivable                                                    180,492

Cash                                                                             1,053

           Total                                                             9,440,392

                                 LIABILITY AND NET ASSETS
Less Liability:

   Accrued Trust fees and expenses                                               2,871

Net Assets:

   Balance applicable to 10,000 Units of fractional
     undivided interest outstanding (Note (c)):

      Capital, plus net unrealized market appreciation 
        of $337,329                                             $9,258,847

      Undistributed net investment income (Note (b))               178,674

           Net assets                                                       $9,437,521

Net asset value per Unit ($9,437,521 divided by 10,000 Units)                $  943.75

</TABLE>
                            See notes to financial statements

                                           A-2


<PAGE>

                                 STATEMENTS OF OPERATIONS
                                             
                                 NATIONAL MUNICIPAL TRUST
                                        SERIES 148
                                       (UNINSURED)
<TABLE>
<CAPTION>

                                                         For the year ended April 30,
                                                          1997        1996     1995
<S>                                                     <C>         <C>       <C>
Investment income - interest                            $654,614    $665,905  $682,693

Less Expenses: 

   Trust fees and expenses                                15,524      15,812    16,209

           Total expenses                                 15,524      15,812    16,209

           Investment income - net                       639,090     650,093   666,484

Net gain on investments:

   Realized loss on securities sold or redeemed           (3,295)     (4,792)   (5,826)

   Net unrealized market appreciation                      9,364     210,575    71,962

           Net gain on investments                         6,069     205,783    66,136

Net increase in net assets resulting from operations    $645,159    $855,876  $732,620

</TABLE>
                            See notes to financial statements

                                           A-3


<PAGE>

                           STATEMENTS OF CHANGES IN NET ASSETS
                                             
                                 NATIONAL MUNICIPAL TRUST
                                        SERIES 148
                                       (UNINSURED)
<TABLE>
<CAPTION>

                                                      For the years ended April 30,
                                                      1997         1996       1995

<S>                                                <C>          <C>         <C>
Operations:

   Investment income - net                         $  639,090   $  650,093   $ 666,484

   Realized loss on securities sold or redeemed        (3,295)      (4,792)     (5,826)

   Net unrealized market appreciation                   9,364      210,575      71,962

           Net increase in net assets resulting 
             from operations                          645,159      855,876     732,620

Less Distributions to Unit Holders: 

   Principal                                         (140,000)    (265,000)   (220,000)

   Investment income - net                           (623,700)    (636,500)   (654,400)

           Total distributions                       (763,700)    (901,500)   (874,400)

Net decrease in net assets                           (118,541)     (45,624)   (141,780)

Net assets:

   Beginning of year                                9,556,062    9,601,686   9,743,466

   End of year (including undistributed net
     investment income of $178,674, $177,397 and
     $177,002, respectively)                       $9,437,521   $9,556,062  $9,601,686

</TABLE>
                            See notes to financial statements

                                           A-4


<PAGE>
                       NOTES TO FINANCIAL STATEMENTS
                                      
                          NATIONAL MUNICIPAL TRUST
                                 SERIES 148
                                (UNINSURED)
                                      
                               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 Schedule of Portfolio 
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 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 5, 1992) represents the cost of investments to the Trust based 
on the offering side evaluations as of 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 an annual Trustee's fee, estimated expenses, 
Evaluator's fees, and an annual Sponsor's portfolio supervision 
fee, and may incur additional charges as explained under "Expenses 
and Charges" in Part B of this Prospectus.

(b) DISTRIBUTIONS

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

                                    A-5


<PAGE>
                       NOTES TO FINANCIAL STATEMENTS
                                      
                          NATIONAL MUNICIPAL TRUST
                                 SERIES 148
                                (UNINSURED)
                                      
                               April 30, 1997

(c) ORIGINAL COST TO INVESTORS

    The original cost to investors represents the aggregate initial public 
offering price as of the date of initial deposit (May 5, 1992) exclusive 
of accrued interest.


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

<TABLE>
       <S>                                                      <C>
       Original cost to investors                               $10,085,316
       Less:  Gross underwriting commissions (sales charge)        (479,100)
       Net cost to investors                                      9,606,216
       Cost of securities sold or redeemed                         (746,694)
       Net unrealized market appreciation                           337,329
       Accumulated interest accretion                                61,996
       Net amount applicable to investors                       $ 9,258,847
</TABLE>

(d) OTHER INFORMATION

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

<TABLE>
<CAPTION>
                                            For the years ended April 30,
                                             1997        1996        1995
       
       <S>                                 <C>         <C>          <C>
       Interest income                     $ 65.46     $ 66.59      $ 68.27
       Expenses                              (1.56)      (1.58)       (1.63)
       Investment income - net               63.90       65.01        66.64
       Income distributions                 (62.37)     (63.65)      (65.44)
                                              1.53        1.36         1.20
       Principal distributions              (14.00)     (26.50)      (22.00)
       Realized loss on securities
         sold or redeemed                     (.33)       (.48)        (.58)
       Net unrealized market apprecia-
         tion                                 .94        21.06         7.20
       Net decrease in net asset value     (11.86)       (4.56)      (14.18)
       Net asset value - beginning
         of year                           955.61       960.17       974.35
       Net asset value - end of year      $943.75      $955.61      $960.17
</TABLE>
                                        A-6


<PAGE>


                                   SCHEDULE OF PORTFOLIO SECURITIES
                                                   
                                       NATIONAL MUNICIPAL TRUST
                                              SERIES 148
                                             (UNINSURED)
                                                   
                                            April 30, 1997
                                                   
<TABLE>
<CAPTION>

Port-                                                                                                   Optional
folio                                 Rating       Face       Coupon   Maturity    Sinking Fund        Refunding        Market
 No.        Title of Securities        <F1>        Amount       Rate       Date    Redemptions<F3>     Redemptions<F2>   Value
                                                                                                                        <F4><F5>
<C>  <S>                               <C>    <C>            <C>       <C>        <C>               <C>             <C>
 1.  City of Miami, Florida,
     Health Facilities Authority,
     Hospital Revenue Refunding
     Bonds, Series 1988A (Mercy           
     Hospital Project).                A3<F7>  $1,000,000     8.125%   08/01/11    08/01/01@100      08/01/98@102    $1,058,560

 2.  Illinois Educational
     Facilities Authority, Reve-
     nue Bonds, DePaul Univers-
     ity, Series 1989A.  <F8>          A-        190,000     7.375    04/01/19   04/01/10@100       04/01/99@102       203,454

 3.  Illinois Housing Develop-
     ment Authority, Multi-Family
     Housing Bonds, 1991 Series 
     A.                                A+        500,000     8.250    07/01/16   07/01/11@100       07/01/01@102       536,825

 4.  City of New Orleans, 
     Louisiana, General Obliga-
     tion Refunding Bonds, Series
     1991, AMBAC Insured.              AAA       500,000     0.000    09/01/17   NONE               NONE               152,655

 5.  Louisiana Public Facili-
     ties Authority, Single-
     Family Mortgage Purchase
     Bonds, Series 1991.               Aa<F7>    630,000     7.375    10/01/12   NONE               10/01/01@103       656,473

 6.  Maine Educational Loan 
     Authority, Educational Loan
     Revenue Bonds, Series 1992A.
     <F6>                              A<F7>     340,000     7.150    12/01/16   12/01/08@100       12/01/02@102       361,022

 7.  New York Local Government
     Assistance Corporation,
     Series 1992A. <F8>                Aaa<F7>   600,000     6.875    04/01/19   04/01/13@100       04/01/02@102       663,174

 8.  Tulsa Industrial Author-
     ity, Hospital Revenue Bonds, 
     (Tulsa Regional Medical 
     Center), Series 1991A.  <F8>      AAA     1,200,000     7.625    06/01/17   06/01/07@100       06/01/01@102     1,344,600

 9.  The Hospitals and Higher 
     Education Facilities Author-
     ity of Philadelphia, Hospi-
     tal Revenue Bonds, Series A
     and B of 1991 (Graduate
     Health System Obligated
     Group).                           BBB+    1,000,000     7.250    07/01/18   07/01/11@100       07/01/02@102     1,034,110

10.  Puerto Rico Electric 
     Power Authority, Power Reve-
     nue Bonds, Series O 1989.         BBB+      295,000     0.000    07/01/17   NONE               NONE                90,945

11.  Puerto Rico Electric 
     Power Authority, Power Reve-
     nue Refunding Bonds, Series
     N 1989.                           BBB+       65,000     0.000    07/01/17   NONE               NONE                19,458

12.  Rhode Island Housing and
     Mortgage, Finance Corpora-
     tion, Homeownership Oppor-
     tunity Bonds.  <F6>               AA+     1,250,000     7.550    10/01/22   04/01/06@100       06/03/01@102     1,317,975

13.  Dallas-Fort Worth Inter-
     national Airport Facility
     Improvement Corporation, 
     American Airlines, Inc. 
     Revenue Bonds, Series 1990.
     <F6>                              Baa2<F7> 1,200,000     7.500    11/01/25   11/01/10@100       11/01/00@102     1,275,156

14.  Public Utility District 
     No. 1 of Chelan County,
     Washington, Chelan Hydro
     Consolidated System Revenue
     Bonds, Series 1991A.  <F6>        Aa3(7)    500,000     7.600    07/01/25   NONE               07/01/03@100       544,440

                                               $9,270,000                                                            $9,258,847
</TABLE>

                                See notes to schedule of portfolio securities

                                                        A-7


<PAGE>
               NOTES TO SCHEDULE OF PORTFOLIO SECURITIES
                                    
                        NATIONAL MUNICIPAL TRUST
                               SERIES 148
                              (UNINSURED)
                                    
                             April 30, 1997

<F1> All ratings are provided by Standard & Poor's Corporation, unless 
otherwise indicated.  A brief description of applicable Security 
ratings is given under "Bond Ratings" in Part B of this Prospectus.

<F2> 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.

<F3> 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 on that date.

<F4> 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 on that date.

<F5> At April 30, 1997, the net unrealized market appreciation of all 
Securities was comprised of the following:

<TABLE>
       <S>                                            <C>
       Gross unrealized market appreciation            $360,874
       Gross unrealized market depreciation             (23,545)
       Net unrealized market appreciation              $337,329
</TABLE>

    The amortized cost of the Securities for Federal income tax purposes 
was $8,921,518 at April 30, 1997.

<F6> In the opinion of bond counsel to the issuing governmental 
authorities, interest payments on these bonds will be a tax 
preference item for individuals and corporations for alternative 
minimum tax purposes.  Normally, the bonds pay interest 
semiannually.  The payment dates can generally be determined based 
on the date of maturity, i.e., a bond maturing on December 1 will 
pay interest semiannually on June 1 and December 1.  See "Tax 
Status" in Part B of this Prospectus.

<F7> Moody's Investors Service, Inc. Rating.

<F8> The Issuers of Portfolio Nos. 2, 7 and 8 have indicated that they 
will refund these Securities on their respective optional 
redemption dates.
                                  A-8


<PAGE>
                             STATEMENT OF FINANCIAL CONDITION
                                             
                                 NATIONAL MUNICIPAL TRUST
                                   MULTISTATE SERIES 50
                                      NEW YORK TRUST
                              (INSURED (INTERMEDIATE TERM))
                                             
                                      April 30, 1997

                                      TRUST PROPERTY

<TABLE>
<S>                                                                         <C>
Investments in municipal bonds at market value (amortized cost
  $4,311,052) (Note (a) and Schedule of Portfolio Securities
  Notes (4) and (5))                                                        $4,463,582

Accrued interest receivable                                                     56,044

Cash                                                                            14,318

           Total                                                             4,533,944

                                 LIABILITY AND NET ASSETS

Less Liability:

   Accrued Trust fees and expenses                                               3,335


Net Assets:

   Balance applicable to 4,294 Units of fractional undivided
     interest outstanding (Note (c)):

      Capital, plus unrealized market appreciation 
        of $152,530                                             $4,463,582

      Undistributed principal and net investment income 
        (Note (b))                                                  67,027

           Net assets                                                       $4,530,609

Net asset value per Unit ($4,530,609 divided by 4,294 Units)                 $1,055.10

</TABLE>
                            See notes to financial statements

                                           A-9


<PAGE>

                                 STATEMENTS OF OPERATIONS
                                             
                                 NATIONAL MUNICIPAL TRUST
                                   MULTISTATE SERIES 50
                                      NEW YORK TRUST
                              (INSURED (INTERMEDIATE TERM))
<TABLE>
<CAPTION>

                                                         For the years ended April 30,
                                                          1997        1996       1995
<S>                                                     <C>         <C>       <C>
Investment income - interest                            $273,043    $280,678  $283,114

Less Expenses: 

   Trust fees and expenses                                 7,422       7,654     7,753

           Total expenses                                  7,422       7,654     7,753

           Investment income - net                       265,621     273,024   275,361

Net (loss) gain on investments:

   Realized gain on securities sold or redeemed            5,652       9,294      -   

   Unrealized market (depreciation) appreciation         (66,578)     27,820    (7,225)

           Net (loss) gain on investments                (60,926)     37,114    (7,225)

Net increase in net assets resulting from operations    $204,695    $310,138  $268,136

</TABLE>
                            See notes to financial statements

                                           A-10


<PAGE>

                           STATEMENTS OF CHANGES IN NET ASSETS
                                             
                                 NATIONAL MUNICIPAL TRUST
                                   MULTISTATE SERIES 50
                                      NEW YORK TRUST
                              (INSURED (INTERMEDIATE TERM))
<TABLE>
<CAPTION>

                                                      For the years ended April 30,
                                                      1997         1996        1995
<S>                                                <C>          <C>         <C>
Operations:

   Investment income - net                         $  265,621   $  273,024   $ 275,361

   Realized gain on securities sold or redeemed         5,652        9,294       -   

   Net unrealized market (depreciation) apprecia-
     tion                                             (66,578)      27,820      (7,225)

           Net increase in net assets resulting 
             from operations                          204,695      310,138     268,136

Less Distributions to Unit Holders: 

   Investment income - net                           (254,812)    (261,388)   (264,298)

          Total distributions                        (254,812)    (261,388)   (264,298)

Less Capital Share Transactions:

   Redemption of 156 Units and 110 Units,
     respectively                                    (163,396)    (117,477)       -   

   Accrued interest on redemption                      (2,285)      (1,636)       -   

          Total capital share transactions           (165,681)    (119,113)       -   

Net (decrease) increase in net assets                (215,798)     (70,363)      3,838

Net assets:

   Beginning of year                                4,746,407    4,816,770   4,812,932

   End of year (including undistributed principal
     and net investment income of $67,027, and
     undistributed net investment income of 
     $66,150 and $70,012, respectively)            $4,530,609   $4,746,407  $4,816,770

</TABLE>
                            See notes to financial statements

                                           A-11


<PAGE>
                       NOTES TO FINANCIAL STATEMENTS
                                      
                          NATIONAL MUNICIPAL TRUST
                            MULTISTATE SERIES 50
                               NEW YORK TRUST
                       (INSURED (INTERMEDIATE TERM))

                               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 Schedule of Portfolio 
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 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 5, 1992) represents the cost of investments to the Trust based 
on the offering side evaluations as of 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 an annual Trustee's fee, estimated expenses, 
Evaluator's fees, and an annual Sponsor's portfolio supervision 
fee, and may incur additional charges as explained under "Expenses 
and Charges" in Part B of this Prospectus.

(b) DISTRIBUTIONS

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

                                    A-12


<PAGE>
                       NOTES TO FINANCIAL STATEMENTS
                                      
                          NATIONAL MUNICIPAL TRUST
                            MULTISTATE SERIES 50
                               NEW YORK TRUST
                       (INSURED (INTERMEDIATE TERM))

                               April 30, 1997

(c) ORIGINAL COST TO INVESTORS

    The original cost to investors represents the aggregate initial public 
offering price as of the date of initial deposit (May 5, 1992) exclusive 
of accrued interest.


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

<TABLE>
       <S>                                                     <C>
       Original cost to investors                              $4,713,428
       Less:  Gross underwriting commissions (sales charge)      (188,556)
       Net cost to investors                                    4,524,872
       Cost of Securities sold or redeemed                       (266,582)
       Unrealized market appreciation                             152,530
       Accumulated interest accretion                              52,762
       Net amount applicable to investors                      $4,463,582
</TABLE>

(d) OTHER INFORMATION

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

<TABLE>
<CAPTION>
                                         For the years ended April 30,
                                             1997        1996        1995
       <S>                                <C>         <C>         <C>
       Net investment income distribu-
         tions during year                $   58.18   $   57.99   $   57.96
       
       Net asset value at end of year     $1,055.10   $1,066.61   $1,056.31
       
       Trust Units outstanding at end of 
         year                                 4,294       4,450       4,560
</TABLE>
                                        A-13


<PAGE>


                              SCHEDULE OF PORTFOLIO SECURITIES
                                              
                                  NATIONAL MUNICIPAL TRUST
                                    MULTISTATE SERIES 50
                                       NEW YORK TRUST
                                (INSURED (INTERMEDIATE TERM))

                                       April 30, 1997
<TABLE>
<CAPTION>

Port-                                                                                                   Optional
folio                                  Rating      Face       Coupon   Maturity    Sinking Fund        Refunding        Market
 No.      Title of Securities <F7>      <F1>      Amount       Rate       Date    Redemptions<F3>    Redemptions<F2>    Value
                                                                                                                       <F4><F5>
<C>  <S>                                <C>     <C>           <C>       <C>        <C>               <C>             <C>
 1.  City of Buffalo, New York, 
     Series 1992 A and B, MBIA
     Insured.                           AAA     $  405,000    6.100%   04/01/03    NONE              04/01/02@102    $  428,628

 2.  City of Buffalo, New York,
     Series 1992 A and B, MBIA
     Insured.                           AAA        250,000    6.100    04/01/03   NONE               04/01/02@102       264,585

 3.  Dormitory Authority of the
     State of New York, College
     and University Education
     Loan, Revenue Bonds, 1992
     Issue, MBIA Insured.  <F6>         AAA        500,000    6.200    07/01/01   NONE               NONE               523,435

 4.  New York City Educational
     Construction Fund, Revenue
     Bonds, 1989 Series A, MBIA
     Insured.  <F8>                     AAA        515,000    6.875    04/01/01   NONE               10/01/[email protected]     550,514

 5.  New York State Thruway
     Authority, Emergency High-
     way, Construction and Recon-
     struction Bonds, 1992 Series
     A, FSA Insured.                    AAA        445,000    6.000    01/01/02   NONE               NONE               465,363

 6.  Niagara Falls Bridge Com-
     mission, Toll Bridge System
     Revenue Bonds, Series 1992,
     FGIC Insured. <F8>                 AAA        450,000    6.000    10/01/03   NONE               10/01/02@102       482,216

 7.  The City of New York, Gen-
     eral Obligation Bonds, Fis-
     cal 1990, Series H, MBIA
     Insured.                           AAA        710,000    7.200    08/01/02   NONE               08/01/[email protected]     770,478

 8.  The City of New York, Gen-
     eral Obligation Bonds, Fis-
     cal 1992, Series D, FGIC
     Insured.                           AAA        255,000    0.000    02/01/03   NONE               NONE               191,936

 9.  Triborough Bridge and Tun-
     nel Authority, Special Obli-
     gation Refunding Bonds,
     Series 1991A, MBIA Insured.        AAA        750,000    6.200    01/01/01   NONE               NONE               786,427

                                                $4,280,000                                                           $4,463,582
</TABLE>
                             See notes to schedule of portfolio securities
                                                                
                                                  A-14


<PAGE>
               NOTES TO SCHEDULE OF PORTFOLIO SECURITIES
                                    
                        NATIONAL MUNICIPAL TRUST
                          MULTISTATE SERIES 50
                             NEW YORK TRUST
                     (INSURED (INTERMEDIATE TERM))

                             April 30, 1997

<F1> 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.

<F2> 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.

<F3> 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 on that date.

<F4> 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 on that date.

<F5> At April 30, 1997, the unrealized market appreciation of all 
Securities was comprised of the following:

<TABLE>
       <S>                                             <C>
       Gross unrealized market appreciation            $152,530
       Gross unrealized market depreciation                -   
       Unrealized market appreciation                  $152,530
</TABLE>

    The amortized cost of the Securities for Federal income tax purposes 
was $4,311,052 at April 30, 1997.

<F6> In the opinion of bond counsel to the issuing governmental 
authorities, interest payments on these bonds will be a tax 
preference item for individuals and corporations for alternative 
minimum tax purposes.  Normally, the bonds pay interest 
semiannually.  The payment dates can generally be determined based 
on the date of maturity, i.e., a bond maturing on December 1 will 
pay interest semiannually on June 1 and December 1.  See "Tax 
Status" in Part B of this Prospectus.

<F7> Insurance to maturity has been obtained by the Issuer from the 
listed Insurance Company for the Securities.  The "AAA" ratings on 
these Securities are based in part on the creditworthiness and 
claims-paying ability of the Insurance Company insuring such 
Security to maturity.  No premium is payable therefore by the 
Trust.

<F8> The Issuers of Portfolio Nos. 4 and 6 have indicated that they will 
refund these Securities on their respective optional redemption 
dates.
                                  A-15
<PAGE>

(MODULE)
  [NAME]      NMT-PUT-PTB-996
  [CIK]       0000941856
  [CCC]       3ttrjz#m
(/MODULE)

<PAGE>

            This Post-Effective Amendment to the Registration Statement on
Form S-6 comprises the following papers and documents: 

            The facing sheet on Form S-6. 

            The Prospectus. 

            Signatures. 

                                      UNDERTAKING

                  The Sponsor undertakes that it will not instruct the
            Trustee to accept from (i) Financial Guaranty Insurance
            Company, Municipal Bond Insurance Association or any other
            insurance company affiliated with Sponsor, in settlement of any
            claim, less than an amount sufficient to pay any principal or
            interest (and, in the case of a taxability redemption, premium)
            then due on any Security in accordance with the municipal bond
            guaranty insurance policy attached to such Security or (ii) any
            affiliate of the the Sponsor who has any obligation with
            respect to any Security, less than the full amount due pursuant
            to the obligation, unless such instructions have been approved
            by the Securities and Exchange Commission pursuant to Rule
            17d-1 under the Investment Company Act of 1940.
            The following Exhibits: 

         ****Ex-3.(i)  -    Restated Certificate of Incorporation of
                              Prudential Securities Incorporated dated
                              March 29, 1993.
       *****Ex-3.(ii)  -    Revised By-Laws of Prudential Securities
                              Incorporated as amended through June 21,
                              1997.
                +Ex-4  -    Trust Indenture and Agreement dated
                              September 6, 1989.  
               *Ex-23  -    Consent of Kenny S&P Evaluation Services, a
                              division of J.J. Kenny Co., Inc. (as
                              evaluator).
             ***Ex-24  -    Powers of Attorney executed by a majority of
                              the Board of Directors of Prudential
                              Securities Incorporated.
               *Ex-27  -    Financial Data Schedule for Series 148.
             *Ex-27.1  -    Financial Data Schedule for Multistate 
                              Series 50 (New York).
                Ex-99       Information as to Officers and Directors of
                              Prudential Securities Incorporated is
                              incorporated by reference to Schedules A and
                              D of Form BD filed by Prudential Securities
                              Incorporated pursuant to Rules l5b1-1 and
                              l5b3-1 under the Securities Exchange Act of
                              1934 (1934 Act File No. 8-16267). 

                                   II-1

<PAGE>

            **Ex-99.2  -    Affiliations of Sponsor with other investment
                              companies. 
            **Ex-99.3  -    Broker's Blanket Policies, Standard Form No. 14
                              in the aggregate amount of $62,500,000. 
             +Ex-99.4  -    Investment Advisory Agreement. 
_________________________

        *   Filed herewith.

       **   Incorporated by reference to exhibit of same designation filed
            with the Securities and Exchange Commission as an exhibit to
            the Registration Statement under the Securities Act of 1933 of
            Prudential Unit Trusts, Insured Tax-Exempt Series 1,
            Registration No. 6-89263. 

      ***   Incorporated by reference to exhibits of same designation filed
            with the Securities and Exchange Commission as an exhibit to
            the Registration Statement under the Securities Act of 1933 of
            National Municipal Trust Series 172, Registration No. 33-54681
            and National Equity Trust, Top Ten Portfolio Series 3,
            Registration No. 333-15919.

     ****   Incorporated by reference to exhibit of same designation filed
            with the Securities and Exchange Commission as an exhibit to
            the Registration Statement under the Securities Act of 1933 of
            Government Securities Equity Trust Series 5, Registration No.
            33-57992.

    *****   Incorporated by reference to exhibit of same designation filed
            with the Securities and Exchange Commission as an exhibit to
            the Registration Statement under the Securities Act of 1933 of
            National Municipal Trust, Series 186, Registration No.
            33-54697.

        +   Incorporated by reference to exhibit of same designation filed
            with the Securities and Exchange Commission as an exhibit to
            the Registration Statement under the Securities Act of 1933 of
            National Municipal Trust, Insured Series 43, Registration No.
            33-29314.

                                      II-2

<PAGE>

                                SIGNATURES

          Pursuant to the requirements of the Securities Act of 1933, the
registrant, National Municipal Trust, Series 148 and Multistate Series 50
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 Registration Statement or amendments thereto
to be signed on its behalf by the undersigned thereunto duly authorized, in
the City of New York, and State of New York on the 19th day of August,
1997.

                         NATIONAL MUNICIPAL TRUST,
                         Series 148
                         Multistate Series 50
                           (Registrant)

                         By PRUDENTIAL SECURITIES INCORPORATED
                              (Depositor)

                         By the following persons,* who
                            constitute a majority of the
                            Board of Directors of Prudential
                            Securities Incorporated

                                   Alan D. Hogan
                                   A. Laurence Norton, Jr.
                                   Leland B. Paton
                                   Martin Pfinsgraff
                                   Vincent T. Pica II
                                   Hardwick Simmons
                                   Lee B. Spencer, Jr.


                         By __/s/ Kenneth Swankie    ___
                               (Kenneth Swankie,
                               Senior Vice President,
                               Manager--Unit Investment
                               Trust Department,
                               as authorized 
                               signatory for Prudential Securities 
                               Incorporated and Attorney-
                               in-Fact for the persons
                               listed above)
_____________________

*    Pursuant to Powers of Attorney previously filed. 

                                   II-3

<PAGE>

                            CONSENT OF COUNSEL

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

                                   II-4

<PAGE>

                      CONSENT OF INDEPENDENT AUDITORS

We consent to the use of our report, dated July 15, 1997, accompanying the 
financial statements of the National Municipal Trust, Series 148 (Uninsured) 
and Multistate Series 50 consisting of the New York Trust (Insured 
(Intermediate Term)) 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
DELOITTE & TOUCHE LLP

August 18, 1997
New York, New York

                                      II-5



<PAGE>

                                                              Exhibit 23   


                Letterhead of Kenny S&P Evaluation Services
                   (a division of J.J. Kenny Co., Inc.)

                              August 20, 1997

Prudential Securities Incorporated
1 New York Plaza
New York, NY  10292

               Re:  National Municipal Trust,
                    Post-Effective Amendment No. 5
                    Series 148                    

Gentlemen:

          We have examined the post-effective Amendment to the Registration
Statement File No. 33-46203 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 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
above-referenced Amendment to the Registration Statement for the respective
bonds comprising the trust portfolio are the ratings currently indicated in
our KENNYBASE database as of the date 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

                Letterhead of Kenny S&P Evaluation Services
                   (a division of J.J. Kenny Co., Inc.)

                              August 20, 1997

Prudential Securities Incorporated
1 New York Plaza
New York, NY  10292

               Re:  National Municipal Trust,
                    Post-Effective Amendment No. 5
                    Multistate Series 50          

Gentlemen:

          We have examined the post-effective Amendment to the Registration
Statement File No. 33-46202 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
above-referenced Amendment to the Registration Statement for the respective
bonds comprising the trust portfolio are the ratings currently indicated in
our KENNYBASE database as of the date 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

<TABLE> <S> <C>


<ARTICLE>                    6

<LEGEND>                     THE SCHEDULE CONTAINS SUMMARY FINANCIAL
                             INFORMATION EXTRACTED FROM THE FINANCIAL
                             STATEMENTS FOR NATIONAL MUNICIPAL TRUST
                             SERIES 148 (UNINSURED) AND IS QUALIFIED
                             IN ITS ENTIRETY BY REFERENCE TO SUCH
                             FINANCIAL STATEMENTS

</LEGEND>

<RESTATED>                   

<CIK>                        0000884513

<NAME>                       NATIONAL MUNICIPAL TRUST               
                             SERIES 148 (UNINSURED)

<SERIES>                     

<NAME>                       NATIONAL MUNICIPAL TRUST               
                             SERIES (UNINSURED)

<NUMBER>                     1

<MULTIPLIER>                 1

<PERIOD-TYPE>                YEAR

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

<PERIOD-START>               May-1-1996

<PERIOD-END>                 Apr-30-1997

<INVESTMENTS-AT-COST>        8,921,518 

<INVESTMENTS-AT-VALUE>       9,258,847 

<RECEIVABLES>                180,492 

<ASSETS-OTHER>               1,053 

<OTHER-ITEMS-ASSETS>         0 

<TOTAL-ASSETS>               9,440,392 

<PAYABLE-FOR-SECURITIES>     0 

<SENIOR-LONG-TERM-DEBT>      0 

<OTHER-ITEMS-LIABILITIES>    2,871 

<TOTAL-LIABILITIES>          2,871 

<SENIOR-EQUITY>              0 

<PAID-IN-CAPITAL-COMMON>     8,921,518 

<SHARES-COMMON-STOCK>        10,000 

<SHARES-COMMON-PRIOR>        10,000 

<ACCUMULATED-NII-CURRENT>    178,674 

<OVERDISTRIBUTION-NII>       0 

<ACCUMULATED-NET-GAINS>      0 

<OVERDISTRIBUTION-GAINS>     0 

<ACCUM-APPREC-OR-DEPREC>     337,329 

<NET-ASSETS>                 9,437,521 

<DIVIDEND-INCOME>            0 

<INTEREST-INCOME>            640,501 

<OTHER-INCOME>               14,113 

<EXPENSES-NET>               15,524 

<NET-INVESTMENT-INCOME>      639,090 

<REALIZED-GAINS-CURRENT>     (3,295)

<APPREC-INCREASE-CURRENT>    9,364 

<NET-CHANGE-FROM-OPS>        645,159 

<EQUALIZATION>               0 

<DISTRIBUTIONS-OF-INCOME>    623,700 

<DISTRIBUTIONS-OF-GAINS>     0 

<DISTRIBUTIONS-OTHER>        140,000 

<NUMBER-OF-SHARES-SOLD>      0 

<NUMBER-OF-SHARES-REDEEMED>  0 

<SHARES-REINVESTED>          0 

<NET-CHANGE-IN-ASSETS>       (118,541)

<ACCUMULATED-NII-PRIOR>      177,397 

<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>

<TABLE> <S> <C>


<ARTICLE>                    6

<LEGEND>                     THE SCHEDULE CONTAINS SUMMARY FINANCIAL
                             INFORMATION EXTRACTED FROM THE FINANCIAL
                             STATEMENTS FOR NATIONAL MUNICIPAL TRUST
                             MULTISTATE SERIES 50  NEW YORK TRUST
                             (INSURED (INTERMEDIATE TERM)) AND IS
                             QUALIFIED IN ITS ENTIRETY BY REFERENCE
                             TO SUCH FINANCIAL STATEMENTS

</LEGEND>

<RESTATED>                   

<CIK>                        0000884511

<NAME>                       NATIONAL MUNICIPAL TRUST               
                             MULTISTATE SERIES 50 
                             NEW YORK TRUST
                             (INSURED (INTERMEDIATE TERM))

<SERIES>                     

<NAME>                       NATIONAL MUNICIPAL TRUST               
                             MULTISTATE SERIES 
                             NEW YORK TRUST
                             (INSURED (INTERMEDIATE TERM))

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