MUNICIPAL INVT TR FD MULTISTATE SER 51 DEFINED ASSET FUNDS, 497, 1999-02-02

MUNICIPAL INVT TR FD MULTISTATE SER 51 DEFINED ASSET FUNDS
497, 1999-02-02

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<PAGE>
DEFINED ASSET FUNDSSM
- --------------------------------------------
- ----------------------------------

MUNICIPAL INVESTMENT TRUST FUND
MULTISTATE SERIES--51
(A UNIT INVESTMENT TRUST)
O MICHIGAN, NEW YORK AND PENNSYLVANIA PORTFOLIOS
O PORTFOLIOS OF INSURED LONG-TERM MUNICIPAL
BONDS
O DESIGNED FOR FEDERALLY TAX-FREE INCOME
O EXEMPT FROM SOME STATE TAXES
O MONTHLY DISTRIBUTIONS

SPONSORS:
Merrill Lynch,
Pierce, Fenner & Smith -------------------------------------------------
Incorporated The Securities and Exchange Commission has not
Salomon Smith Barney Inc. approved or disapproved these Securities or
Prudential Securities passed upon the adequacy of this prospectus. Any
Incorporated representation to the contrary is a criminal
PaineWebber Incorporated offense.
Dean Witter Reynolds Inc. Prospectus dated February 2, 1999.

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

Defined Asset FundsSM
Defined Asset FundsSM is America's oldest and largest family of unit investment
trusts, with over $115 billion sponsored over the last 25 years. Defined Asset
Funds has been a leader in unit investment trust research and product
innovation. Our family of Funds helps investors work toward their financial
goals with a full range of quality investments, including municipal, corporate
and government bond portfolios, as well as domestic and international equity
portfolios.

Defined Asset Funds offer a number of advantages:
o A disciplined strategy of buying and holding with a long-term view is the
cornerstone of Defined Asset Funds.
o Fixed portfolio: Defined Funds follow a buy and hold investment strategy;
funds are not managed and portfolio changes are limited.
o Defined Portfolios: We choose the stocks and bonds in advance, so you know
what you're investing in.
o Professional research: Our dedicated research team seeks out stocks or bonds
appropriate for a particular fund's objectives.
o Ongoing supervision: We monitor each portfolio on an ongoing basis.
No matter what your investment goals, tolerance for risk or time horizon,
there's probably a Defined Asset Fund that suits your investment style. Your
financial professional can help you select a Defined Asset Fund that works best
for your investment portfolio.

THE FINANCIAL INFORMATION IN THIS PROSPECTUS IS AS OF OCTOBER 31, 1998, THE
EVALUATION DATE.

CONTENTS
PAGE
-----------
Michigan Insured Portfolio--
Risk/Return Summary.................................. 3
New York Insured Portfolio-- Risk/Return Summary........ 6
Pennsylvania Insured Portfolio-- Risk/Return Summary.... 9
What You Can Expect From Your Investment................ 13
Monthly Income....................................... 13
Return Figures....................................... 13
Records and Reports.................................. 13
The Risks You Face...................................... 14
Interest Rate Risk................................... 14
Call Risk............................................ 14
Reduced Diversification Risk......................... 14
Liquidity Risk....................................... 14
Concentration Risk................................... 14
State Concentration Risk............................. 15
Bond Quality Risk.................................... 17
Insurance Related Risk............................... 17
Litigation and Legislation Risks..................... 17
Selling or Exchanging Units............................. 18
Sponsors' Secondary Market........................... 18
Selling Units to the Trustee......................... 18
Exchange Option...................................... 19
How The Fund Works...................................... 19
Pricing.............................................. 19
Evaluations.......................................... 19
Income............................................... 19
Expenses............................................. 19
Portfolio Changes.................................... 20
Fund Termination..................................... 20
Certificates......................................... 21
Trust Indenture...................................... 21
Legal Opinion........................................ 22
Auditors............................................. 22
Sponsors............................................. 22
Trustee.............................................. 22
Underwriters' and Sponsors' Profits 22
Public Distribution.................................. 23
Code of Ethics....................................... 23
Year 2000 Issues..................................... 23
Taxes................................................... 23
Supplemental Information................................ 25
Financial Statements.................................... D-1

2
<PAGE>
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MICHIGAN INSURED PORTFOLIO--RISK/RETURN SUMMARY

1. WHAT IS THE FUND'S OBJECTIVE?
The Fund seeks interest income that is exempt from regular
federal income taxes and some state and local taxes by
investing in a fixed portfolio consisting primarily of
insured, long term municipal revenue bonds.
2. WHAT ARE MUNICIPAL REVENUE BONDS?
Municipal revenue bonds are bonds issued by states,
municipalities and public authorities to finance the cost
of buying, building or improving various projects intended
to generate revenue, such as airports, health care
facilities, housing and municipal electric, water and sewer
utilities. Generally, payments on these bonds depend solely
on the revenues generated by the projects, excise taxes or
state appropriations, and are not backed by the
government's taxing power.

3. WHAT IS THE FUND'S INVESTMENT STRATEGY?
O The Fund plans to hold to maturity 7 long-term tax-exempt
municipal bonds with an aggregate face amount of
$3,155,000.
o The Fund is a unit investment trust which means that,
unlike a mutual fund, the Portfolio is not managed.
o The bonds are rated AAA or Aaa by Standard & Poor's,
Moody's or Fitch.
o Many of the bonds can be called at a premium declining over
time to par value. Some bonds may be called earlier at par
for extraordinary reasons.
o 100% of the bonds are insured by insurance companies that
guarantee timely payments of principal and interest on the
bonds (but not Fund units or the market value of the bonds
before they mature).

The Portfolio consists of municipal bonds of the following
types:

APPROXIMATE
PORTFOLIO
PERCENTAGE

/ / Airports/Ports/Highways 16%
/ / General Obligation 36%
/ / Hospitals/Health Care 16%
/ / Municipal Water/Sewer Utilities 16%
/ / Special Tax Issues 16%

4. WHAT ARE THE SIGNIFICANT RISKS?
YOU CAN LOSE MONEY BY INVESTING IN THE FUND. THIS CAN
HAPPEN FOR VARIOUS REASONS, INCLUDING:
o Rising interest rates, an issuer's worsening financial
condition or a drop in bond ratings can reduce the price of
your units.
o Because the Fund is concentrated in general obligation
bonds, adverse developments in this sector may affect the
value of your units.
o Assuming no changes in interest rates, when you sell your
units, they will generally be worth less than your cost
because your cost included a sales fee.
o The Fund will receive early returns of principal if bonds
are called or sold before they mature. If this happens your
income will decline and you may not be able to reinvest the
money you receive at as high a yield or as long a maturity.

ALSO, THE PORTFOLIO IS CONCENTRATED IN BONDS OF MICHIGAN SO
IT IS LESS DIVERSIFIED THAN A NATIONAL FUND AND IS SUBJECT
TO RISKS PARTICULAR TO MICHIGAN WHICH ARE BRIEFLY DESCRIBED
UNDER STATE CONCENTRATION RISKS LATER IN THIS PROSPECTUS.

3
<PAGE>

5. IS THIS FUND APPROPRIATE FOR YOU?
Yes, if you want federally tax-free income. You will
benefit from a professionally selected and supervised
portfolio whose risk is reduced by investing in insured
bonds of several different issuers.
The Fund is not appropriate for you if you want a
speculative investment that changes to take advantage of
market movements, if you do not want a tax-advantaged
investment or if you cannot tolerate any risk.

DEFINING YOUR INCOME

WHAT YOU MAY EXPECT (Payable on the 25th day of
the month to holders of record on the 10th day
of the month):
Regular Monthly Income per unit $ 4.34
Annual Income per unit: $ 52.13
These figures are estimates determined on the evaluation
day; actual payments may vary.

6. WHAT ARE THE FUND'S FEES AND EXPENSES?
This table shows the costs and expenses you may pay,
directly or indirectly, when you invest in the Fund.

INVESTOR FEES
2.90%
Maximum Sales Fee (Load) on new purchases
(as a percentage of $1,000 invested)

Employees of some of the Sponsors and their affiliates may
pay a reduced sales fee of no less than $5.00 per unit.
The maximum sales fee is reduced if you invest at least
$100,000, as follows:

YOUR MAXIMUM
SALES FEE
IF YOU INVEST: WILL BE:
----------------------------------- -----------------
Less than $100,000 2.90%
$100,000 to $249,999 2.65%
$250,000 to $499,999 2.40%
$500,000 to $999,999 2.15%
$1,000,000 and over 1.90%

Maximum Exchange Fee 1.90%

ESTIMATED ANNUAL FUND OPERATING EXPENSES

AMOUNT
PER UNIT
-----------
$ 0.70
Trustee's Fee
$ 0.37
Portfolio Supervision,
Bookkeeping and
Administrative Fees
(including updating
expenses)
$ 0.41
Evaluator's Fee
$ 0.35
Other Operating Expenses
-----------
$ 1.83
TOTAL

The Sponsors historically paid updating expenses.

7. HOW HAVE SIMILAR FUNDS PERFORMED IN THE PAST?
In the following chart we show past performance of prior
Michigan Portfolios, which had investment objectives,
strategies and types of bonds substantially similar to this
Fund. These prior Series differed in that they charged a
higher sales fee. These prior Michigan Series were offered
between March 9, 1988 and September 19, 1996 and were
outstanding on December 31, 1998. OF COURSE, PAST
PERFORMANCE OF PRIOR SERIES IS NO GUARANTEE OF FUTURE
RESULTS OF THIS FUND.
AVERAGE ANNUAL COMPOUND TOTAL RETURNS
FOR PRIOR SERIES
Reflecting all expenses. For periods ended 12/31/98.

WITH SALES FEE NO SALES FEE
1 YEAR 5 YEARS 1 YEAR 5 YEARS
- ---------------------------------------------------------------
High 5.48% 4.92% 2.97% 6.10%
Average 2.66 4.21 5.37 5.19
Low 0.86 3.66 7.72 4.46
- ---------------------------------------------------------------

Average
Sales fee 2.68% 4.88%

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

Note: All returns represent changes in unit price with distributions reinvested
into the Municipal Fund Investment Accumulation Program.

8. IS THE FUND MANAGED?
Unlike a mutual fund, the Fund is not managed and bonds are
not sold because of market changes. Rather, experienced
Defined Asset Funds financial analysts regularly review the
bonds in the Fund. The Fund may sell a bond if certain
adverse credit or other conditions exist.

4
<PAGE>

9. HOW DO I BUY UNITS?
The minimum investment is one unit.
You can buy units from any of the Sponsors and other
broker-dealers. The Sponsors are listed later in this
prospectus. Some banks may offer units for sale through
special arrangements with the Sponsors, although certain
legal restrictions may apply.
UNIT PRICE PER UNIT $1,055.38
(as of October 31, 1998)
Unit price is based on the net asset value of the Fund plus
the sales fee. An amount equal to any principal cash, as
well as net accrued but undistributed interest on the unit,
is added to the unit price. An independent evaluator prices
the bonds at 3:30 p.m. Eastern time every business day.
Unit price changes every day with changes in the prices of
the bonds in the Fund.
10. HOW DO I SELL UNITS?
You may sell your units at any time to any Sponsor or the
Trustee for the net asset value determined at the close of
business on the date of sale. You will not pay any other
fee when you sell your units.

11. HOW ARE DISTRIBUTIONS MADE AND TAXED?
The Fund pays income monthly.
In the opinion of bond counsel when each bond was issued,
interest on the bonds in this Fund is generally 100% exempt
from regular federal income tax. Your income may also be
exempt from some Michigan state and local personal income
taxes if you live in Michigan.
You will also receive principal payments if bonds are sold
or called or mature, when the cash available is more than
$5.00 per unit. You will be subject to tax on any gain
realized by the Fund on the disposition of bonds.
12. WHAT OTHER SERVICES ARE AVAILABLE?
REINVESTMENT
You will receive your income in cash unless you choose to
compound your income by reinvesting at no sales fee in the
Municipal Fund Investment Accumulation Program, Inc. This
program is an open-end mutual fund with a comparable
investment objective, but the bonds will generally not be
insured. Income from this program will generally be subject
to state and local income taxes. For more complete
information about the program, including charges and fees,
ask the Trustee for the program's prospectus. Read it
carefully before you invest. The Trustee must receive your
written election to reinvest at least 10 days before the
record day of an income payment.
EXCHANGE PRIVILEGES
You may exchange units of this Fund for units of certain
other Defined Asset Funds. You may also exchange into this
Fund from certain other funds. We charge a reduced sales fee
on exchanges.

5
<PAGE>
- --------------------------------------------------------------------------------

NEW YORK INSURED PORTFOLIO--RISK/RETURN SUMMARY

3. WHAT IS THE FUND'S INVESTMENT STRATEGY?
O The Fund plans to hold to maturity 7 long-term tax-exempt
municipal bonds with an aggregate face amount of
$5,945,000.
o The Fund is a unit investment trust which means that,
unlike a mutual fund, the Portfolio is not managed.
o The bonds are rated AAA or Aaa by Standard & Poor's,
Moody's or Fitch.
o Many of the bonds can be called at a premium declining over
time to par value. Some bonds may be called earlier at par
for extraordinary reasons.
o 100% of the bonds are insured by insurance companies that
guarantee timely payments of principal and interest on the
bonds (but not Fund units or the market value of the bonds
before they mature).

The Portfolio consists of municipal bonds of the following
types:

APPROXIMATE
PORTFOLIO
PERCENTAGE

/ / Airports/Ports/Highways 30%
/ / General Obligation 15%
/ / Hospitals/Health Care 15%
/ / Lease Rental Appropriation 15%
/ / Municipal Water/Sewer Utilities 15%
/ / Refunded Bonds 10%

4. WHAT ARE THE SIGNIFICANT RISKS?
YOU CAN LOSE MONEY BY INVESTING IN THE FUND. THIS CAN
HAPPEN FOR VARIOUS REASONS, INCLUDING:
o Rising interest rates, an issuer's worsening financial
condition or a drop in bond ratings can reduce the price of
your units.
o Because the Fund is concentrated in airports/ports/highways
bonds, adverse developments in this sector may affect the
value of your units.
o Assuming no changes in interest rates, when you sell your
units, they will generally be worth less than your cost
because your cost included a sales fee.
o The Fund will receive early returns of principal if bonds
are called or sold before they mature. If this happens your
income will decline and you may not be able to reinvest the
money you receive at as high a yield or as long a maturity.

ALSO, THE PORTFOLIO IS CONCENTRATED IN BONDS OF NEW YORK SO
IT IS LESS DIVERSIFIED THAN A NATIONAL FUND AND IS SUBJECT
TO RISKS PARTICULAR TO NEW YORK WHICH ARE BRIEFLY DESCRIBED
UNDER STATE CONCENTRATION RISKS LATER IN THIS PROSPECTUS.

6
<PAGE>

DEFINING YOUR INCOME

WHAT YOU MAY EXPECT (Payable on the 25th day of
the month to holders of record on the 10th day
of the month):
Regular Monthly Income per unit $ 4.35
Annual Income per unit: $ 52.28
These figures are estimates determined on the evaluation
day; actual payments may vary.

6. WHAT ARE THE FUND'S FEES AND EXPENSES?
This table shows the costs and expenses you may pay,
directly or indirectly, when you invest in the Fund.

INVESTOR FEES
2.90%
Maximum Sales Fee (Load) on new purchases
(as a percentage of $1,000 invested)

Employees of some of the Sponsors and their affiliates may
pay a reduced sales fee of no less than $5.00 per unit.
The maximum sales fee is reduced if you invest at least
$100,000, as follows:

Maximum Exchange Fee 1.90%

ESTIMATED ANNUAL FUND OPERATING EXPENSES

AMOUNT
PER UNIT
-----------
$ 0.70
Trustee's Fee
$ 0.37
Portfolio Supervision,
Bookkeeping and
Administrative Fees
(including updating
expenses)
$ 0.22
Evaluator's Fee
$ 0.25
Other Operating Expenses
-----------
$ 1.54
TOTAL

The Sponsors historically paid updating expenses.

7. HOW HAVE SIMILAR FUNDS PERFORMED IN THE PAST?
In the following chart we show past performance of prior
New York Portfolios, which had investment objectives,
strategies and types of bonds substantially similar to this
Fund. These prior Series differed in that they charged a
higher sales fee. These prior New York Series were offered
between January 14, 1988 and October 16, 1996 and were
outstanding on December 31, 1998. OF COURSE, PAST
PERFORMANCE OF PRIOR SERIES IS NO GUARANTEE OF FUTURE
RESULTS OF THIS FUND.
AVERAGE ANNUAL COMPOUND TOTAL RETURNS
FOR PRIOR SERIES
Reflecting all expenses. For periods ended 12/31/98.

WITH SALES FEE NO SALES FEE
1 YEAR 5 YEARS 10 YEARS 1 YEAR 5 YEARS 10 YEARS

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

High 5.93% 5.02% 7.53% 8.20% 8.09% 8.13%
Average 2.83 4.25 7.23 6.01 5.27 7.83
Low 0.35 3.61 7.04 4.11 4.59 7.64

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

Average
Sales fee 3.15% 5.04% 5.82%

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

Note: All returns represent changes in unit price with distributions reinvested
into the Municipal Fund Investment Accumulation Program.

7
<PAGE>

9. HOW DO I BUY UNITS?
The minimum investment is one unit.
You can buy units from any of the Sponsors and other
broker-dealers. The Sponsors are listed later in this
prospectus. Some banks may offer units for sale through
special arrangements with the Sponsors, although certain
legal restrictions may apply.
UNIT PRICE PER UNIT $1,054.41
(as of October 31, 1998)
Unit price is based on the net asset value of the Fund plus
the sales fee. An amount equal to any principal cash, as
well as net accrued but undistributed interest on the unit,
is added to the unit price. An independent evaluator prices
the bonds at 3:30 p.m. Eastern time every business day.
Unit price changes every day with changes in the prices of
the bonds in the Fund.
10. HOW DO I SELL UNITS?
You may sell your units at any time to any Sponsor or the
Trustee for the net asset value determined at the close of
business on the date of sale. You will not pay any other
fee when you sell your units.

11. HOW ARE DISTRIBUTIONS MADE AND TAXED?
The Fund pays income monthly.
In the opinion of bond counsel when each bond was issued,
interest on the bonds in this Fund is generally 100% exempt
from regular federal income tax. Your income may also be
exempt from some New York state and local personal income
taxes if you live in .
You will also receive principal payments if bonds are sold
or called or mature, when the cash available is more than
$5.00 per unit. You will be subject to tax on any gain
realized by the Fund on the disposition of bonds.
12. WHAT OTHER SERVICES ARE AVAILABLE?
REINVESTMENT
You will receive your income in cash unless you choose to
compound your income by reinvesting at no sales fee in the
Municipal Fund Investment Accumulation Program, Inc. This
program is an open-end mutual fund with a comparable
investment objective. Income from this program will
generally be subject to state and local income taxes. For
more complete information about the program, including
charges and fees, ask the Trustee for the program's
prospectus. Read it carefully before you invest. The Trustee
must receive your written election to reinvest at least 10
days before the record day of an income payment.
EXCHANGE PRIVILEGES
You may exchange units of this Fund for units of certain
other Defined Asset Funds. You may also exchange into this
Fund from certain other funds. We charge a reduced sales fee
on exchanges.

8
<PAGE>
- --------------------------------------------------------------------------------

PENNSYLVANIA INSURED PORTFOLIO--RISK/RETURN SUMMARY

3. WHAT IS THE FUND'S INVESTMENT STRATEGY?
O The Fund plans to hold to maturity 7 long-term tax-exempt
municipal bonds with an aggregate face amount of
$3,350,000.
o The Fund is a unit investment trust which means that,
unlike a mutual fund, the Portfolio is not managed.
o The bonds are rated AAA or Aaa by Standard & Poor's,
Moody's or Fitch.
o Many of the bonds can be called at a premium declining over
time to par value. Some bonds may be called earlier at par
for extraordinary reasons.
o 100% of the bonds are insured by insurance companies that
guarantee timely payments of principal and interest on the
bonds (but not Fund units or the market value of the bonds
before they mature).

The Portfolio consists of municipal bonds of the following
types:

APPROXIMATE
PORTFOLIO
PERCENTAGE

/ / Airports/Ports/Highways 7%
/ / General Obligation 18%
/ / Lease Rental Appropriation 27%
/ / Municipal Water/Sewer Utilities 17%
/ / Special Tax Issues 18%
/ / Universities/Colleges 13%

4. WHAT ARE THE SIGNIFICANT RISKS?
YOU CAN LOSE MONEY BY INVESTING IN THE FUND. THIS CAN
HAPPEN FOR VARIOUS REASONS, INCLUDING:
o Rising interest rates, an issuer's worsening financial
condition or a drop in bond ratings can reduce the price of
your units.
o Because the Fund is concentrated in lease rental bonds,
adverse developments in this sector may affect the value of
your units.
o Assuming no changes in interest rates, when you sell your
units, they will generally be worth less than your cost
because your cost included a sales fee.
o The Fund will receive early returns of principal if bonds
are called or sold before they mature. If this happens your
income will decline and you may not be able to reinvest the
money you receive at as high a yield or as long a maturity.

ALSO, THE PORTFOLIO IS CONCENTRATED IN BONDS OF
PENNSYLVANIA SO IT IS LESS DIVERSIFIED THAN A NATIONAL FUND
AND IS SUBJECT TO RISKS PARTICULAR TO PENNSYLVANIA WHICH
ARE BRIEFLY DESCRIBED UNDER STATE CONCENTRATION RISKS LATER
IN THIS PROSPECTUS.

9
<PAGE>

DEFINING YOUR INCOME

WHAT YOU MAY EXPECT (Payable on the 25th day of
the month to holders of record on the 10th day
of the month):
Regular Monthly Income per unit $ 4.35
Annual Income per unit: $ 52.26
These figures are estimates determined on the evaluation
day; actual payments may vary.

6. WHAT ARE THE FUND'S FEES AND EXPENSES?
This table shows the costs and expenses you may pay,
directly or indirectly, when you invest in the Fund.

INVESTOR FEES
2.90%
Maximum Sales Fee (Load) on new purchases
(as a percentage of $1,000 invested)

Employees of some of the Sponsors and their affiliates may
pay a reduced sales fee of no less than $5.00 per unit.
The maximum sales fee is reduced if you invest at least
$100,000, as follows:

Maximum Exchange Fee 1.90%

ESTIMATED ANNUAL FUND OPERATING EXPENSES

AMOUNT
PER UNIT
-----------
$ 0.69
Trustee's Fee
$ 0.37
Portfolio Supervision,
Bookkeeping and
Administrative Fees
(including updating
expenses)
$ 0.38
Evaluator's Fee
$ 0.35
Other Operating Expenses
-----------
$ 1.79
TOTAL

The Sponsors historically paid updating expenses.

7. HOW HAVE SIMILAR FUNDS PERFORMED IN THE PAST?
In the following chart we show past performance of prior
Pennsylvania Portfolios, which had investment objectives,
strategies and types of bonds substantially similar to this
Fund. These prior Series differed in that they charged a
higher sales fee. These prior Pennsylvania Series were
offered between May 19, 1988 and September 13, 1996 and
were outstanding on December 31, 1998. OF COURSE, PAST
PERFORMANCE OF PRIOR SERIES IS NO GUARANTEE OF FUTURE
RESULTS OF THIS FUND.
AVERAGE ANNUAL COMPOUND TOTAL RETURNS
FOR PRIOR SERIES
Reflecting all expenses. For periods ended 12/31/98.

WITH SALES FEE NO SALES FEE
1 YEAR 5 YEARS 10 YEARS 1 YEAR 5 YEARS 10 YEARS

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

High 4.04% 4.94% 7.10% 7.05% 6.12% 7.70%
Average 2.50 4.21 6.98 5.59 5.23 7.58
Low 0.37 3.54 6.85 2.04 4.44 7.44

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

Average
Sales fee 3.07% 5.07% 5.82%

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

Note: All returns represent changes in unit price with distributions reinvested
into the Municipal Fund Investment Accumulation Program.

10
<PAGE>

9. HOW DO I BUY UNITS?
The minimum investment is one unit.
You can buy units from any of the Sponsors and other
broker-dealers. The Sponsors are listed later in this
prospectus. Some banks may offer units for sale through
special arrangements with the Sponsors, although certain
legal restrictions may apply.
UNIT PRICE PER UNIT $1,051.96
(as of October 31, 1998)
Unit price is based on the net asset value of the Fund plus
the sales fee. An amount equal to any principal cash, as
well as net accrued but undistributed interest on the unit,
is added to the unit price. An independent evaluator prices
the bonds at 3:30 p.m. Eastern time every business day.
Unit price changes every day with changes in the prices of
the bonds in the Fund.
10. HOW DO I SELL UNITS?
You may sell your units at any time to any Sponsor or the
Trustee for the net asset value determined at the close of
business on the date of sale. You will not pay any other
fee when you sell your units.

11. HOW ARE DISTRIBUTIONS MADE AND TAXED?
The Fund pays income monthly.
In the opinion of bond counsel when each bond was issued,
interest on the bonds in this Fund is generally 100% exempt
from regular federal income tax. Your income may also be
exempt from some Pennsylvania state and local personal
income taxes if you live in Pennsylvania.
You will also receive principal payments if bonds are sold
or called or mature, when the cash available is more than
$5.00 per unit. You will be subject to tax on any gain
realized by the Fund on the disposition of bonds.
12. WHAT OTHER SERVICES ARE AVAILABLE?
REINVESTMENT
You will receive your income in cash unless you choose to
compound your income by reinvesting at no sales fee in the
Municipal Fund Investment Accumulation Program, Inc. This
program is an open-end mutual fund with a comparable
investment objective, but the bonds generally will not be
insured. Income from this program will generally be subject
to state and local income taxes. For more complete
information about the program, including charges and fees,
ask the Trustee for the program's prospectus. Read it
carefully before you invest. The Trustee must receive your
written election to reinvest at least 10 days before the
record day of an income payment.
EXCHANGE PRIVILEGES
You may exchange units of this Fund for units of certain
other Defined Asset Funds. You may also exchange into this
Fund from certain other funds. We charge a reduced sales fee
on exchanges.

11
<PAGE>
- --------------------------------------------------------------------------------
TAX-FREE VS. TAXABLE INCOME: A COMPARISON OF TAXABLE AND TAX-FREE YIELDS

FOR MICHIGAN RESIDENTS
- --------------------------------------------------------------------------------

COMBINED
EFFECTIVE
TAXABLE INCOME 1999* TAX RATE TAX-FREE YIELD OF
SINGLE RETURN JOINT RETURN % 3% 3.5% 4% 4.5% 5% 5.5% 6% 6.5%
IS EQUIVALENT TO A TAXABLE YIELD OF

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

FOR NEW YORK CITY RESIDENTS
- --------------------------------------------------------------------------------

COMBINED
EFFECTIVE
TAXABLE INCOME 1999* TAX RATE TAX-FREE YIELD OF
SINGLE RETURN JOINT RETURN % 4% 4.5% 5% 5.5% 6% 6.5% 7% 7.5% 8%
IS EQUIVALENT TO A TAXABLE YIELD OF

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

FOR NEW YORK STATE RESIDENTS
- --------------------------------------------------------------------------------

COMBINED
EFFECTIVE
TAXABLE INCOME 1999* TAX RATE TAX-FREE YIELD OF
SINGLE RETURN JOINT RETURN % 4% 4.5% 5% 5.5% 6% 6.5% 7% 8%
IS EQUIVALENT TO A TAXABLE YIELD OF

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

FOR PENNSYLVANIA RESIDENTS
- --------------------------------------------------------------------------------

COMBINED
EFFECTIVE
TAXABLE INCOME 1999* TAX RATE TAX-FREE YIELD OF
SINGLE RETURN JOINT RETURN % 3% 3.5% 4% 4.5% 5% 5.5% 6% 6.5% 7%
IS EQUIVALENT TO A TAXABLE YIELD OF

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

To compare the yield of a taxable security with the yield of a tax-free
security, find your taxable income and read across. The table incorporates 1999
federal and applicable State (and City) income tax rates and assumes that all
income would otherwise be taxed at the investor's highest tax rate. Yield
figures are for example only.

*Based upon net amount subject to federal income tax after deductions and
exemptions. This table does not reflect the possible effect of other tax
factors, such as alternative minimum tax, personal exemptions, the phase out of
exemptions, itemized deductions or the possible partial disallowance of
deductions. Consequently, investors are urged to consult their own tax advisers
in this regard.

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<PAGE>
WHAT YOU CAN EXPECT FROM YOUR INVESTMENT

MONTHLY INCOME

The Fund will pay you regular monthly income. Your monthly income may vary
because of:
o elimination of one or more bonds from the Fund's portfolio because of
calls, redemptions or sales;
o a change in the Fund's expenses; or
o the failure by a bond's issuer to pay interest.

Changes in interest rates generally will not affect your income because the
portfolio is fixed.

Along with your income, you will receive your share of any available bond
principal.

RETURN FIGURES

We cannot predict your actual return, which will vary with unit price, how long
you hold your investment and changes in the portfolio, interest income and
expenses.

Estimated Current Return equals the estimated annual cash to be received from
the bonds in the Fund less estimated annual Fund expenses, divided by the Unit
Price (including the maximum sales fee):

Estimated Annual Estimated
Interest Income - Annual Expenses
- -------------------------------------------------
Unit Price

Estimated Long Term Return is a measure of the estimated return over the
estimated life of the Fund. Unlike Estimated Current Return, Estimated Long Term
Return reflects maturities, discounts and premiums of the bonds in the Fund. It
is an average of the yields to maturity (or in certain cases, to an earlier call
date) of the individual bonds in the portfolio, adjusted to reflect the Fund's
maximum sales fee and estimated expenses. We calculate the average yield for the
portfolio by weighting each bond's yield by its market value and the time
remaining to the call or maturity date.

Yields on individual bonds depend on many factors including general conditions
of the bond markets, the size of a particular offering and the maturity and
quality rating of the particular issues. Yields can vary among bonds with
similar maturities, coupons and ratings.

These return quotations are designed to be comparative rather than predictive.

RECORDS AND REPORTS

You will receive:
o a monthly statement of income payments and any principal payments;
o a notice from the Trustee when new bonds are deposited in exchange or
substitution for bonds originally deposited;
o an annual report on Fund activity; and
o annual tax information. This will also be sent to the IRS. You must report the
amount of tax-exempt interest received during the year.

You may request:
o copies of bond evaluations to enable you to comply with federal and state tax
reporting requirements; and
o audited financial statements of the Fund.

You may inspect records of Fund transactions at the Trustee's office during
regular business hours.

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<PAGE>
THE RISKS YOU FACE

INTEREST RATE RISK

Investing involves risks, including the risk that your investment will decline
in value if interest rates rise. Generally, bonds with longer maturities will
change in value more than bonds with shorter maturities. Bonds in the Fund are
more likely to be called when interest rates decline. This would result in early
returns of principal to you and may result in early termination of the Fund. Of
course, we cannot predict how interest rates may change.

CALL RISK

Many bonds can be prepaid or 'called' by the issuer before their stated
maturity.

For example, some bonds may be required to be called pursuant to mandatory
sinking fund provisions.

Also, an issuer might call its bonds during periods of falling interest rates,
if the issuer's bonds have a coupon higher than current market rates.

An issuer might call its bonds in extraordinary cases, including if:
o it no longer needs the money for the original purpose;
o the project is condemned or sold;
o the project is destroyed and insurance proceeds are used to redeem the
bonds;
o any related credit support expires and is not replaced; or
o interest on the bonds become taxable.

If the bonds are called, your income will decline and you may not be able to
reinvest the money you receive at as high a yield or as long a maturity. An
early call at par of a premium bond will reduce your return.

REDUCED DIVERSIFICATION RISK

If many investors sell their units, the Fund will have to sell bonds. This could
reduce the diversification of your investment and increase your share of Fund
expenses.

LIQUIDITY RISK

You can always sell back your units, but we cannot assure you that a liquid
trading market will always exist for the bonds in the portfolio, especially
since current law may restrict the Fund from selling bonds to any Sponsor. The
bonds will generally trade in the over-the-counter market. The value of the
bonds, and of your investment, may be reduced if trading in bonds is limited or
absent.

CONCENTRATION RISK

When a certain type of bond makes up 25% or more of the portfolio, it is said to
be 'concentrated' in that bond type, which makes the Portfolio less diversified.

Here is what you should know about the Michigan Portfolio's concentration in
general obligation bonds.
o general obligation bonds are backed by the issuer's pledge of its full
faith, credit and taxing power;
o but the taxing power of any government issuer may be limited by provisions
of the state constitution or laws as well as political considerations; and
o an issuer's credit can be negatively affected by various factors, including
population decline that erodes the tax base, natural disasters, decline in
industry, limited access to capital markets or heavy reliance on state or
federal aid.

Here is what you should know about the Pennsylvania Portfolio's concentration in
lease rental bonds. Lease rental bonds are generally issued by governmental
financing authorities that cannot assess a tax to cover the

14
<PAGE>
cost of equipment or construction of buildings that will be used by a state or
local government. The risks associated with these bonds include:
o the failure of the government to appropriate funds for the leasing rental
payments to service the bonds; and
o rental obligations, and therefore payments, may terminate in the event of
damages to or destruction or condemnation of the of the equipment or
building.

Here is what you should know about the New York Portfolio's concentration in
airport/port/highway bonds. These bonds are dependent for payment on revenues
from financial projects including:
o user fees from ports and airports;
o tolls on turnpikes and bridges;
o rents from buildings; and
o additional financial resources including
--federal and state subsidies,
--lease rentals paid by state or local governments, or
--the pledge of a special tax such as a sales tax or a property tax.

Airport income is largely affected by:
o increased competition;
o excess capacity; and
o increased fuel costs.

Changes to the portfolio from bond redemptions, maturities and sales may affect
the Fund's concentrations over time.

STATE CONCENTRATION RISK

MICHIGAN RISKS

Because Michigan's leading sectors are closely integrated with the manufacturing
of durable goods, its economy is more cyclical than non-industrial states and
the nation as a whole. As a result:

o any substantial national economic downturn will likely hurt Michigan's
economy and its state and local governments;

o because the state is highly reliant on the auto industry, its economy could
be hurt by changes in that industry, expecially consolidation, plant
closings and labor disputes;

o while in the past the state's unemployment rate was higher than the
national average, for several years it has been near or below the national
average.

Certain tax changes have reduced or changed the mix of tax revenues of the state
and local governments. In recent years:

o the state sales tax rate was raised;

o the income tax rate was lowered;

o an annual cap was imposed on property tax assessment increases; and

o property taxes used for school funding were cut, and now schools are paid
for by a combination of property taxes and general state revenues.

In addition, certain state laws limit the overall amount of state revenues that
can be raised from taxes, which could affect State operations and restrict the
sharing of revenue with local governments. This, combined with the above tax
changes, could hurt the value of Michigan bonds in the portfolio or make it more
difficult for Michigan's local governments to pay their debt service.

The state's general obligation bonds are rated Aa by Moody's, AA+ by Standard &
Poor's and AA by Fitch.

15
<PAGE>
NEW YORK RISKS

Generally

For decades, New York's economy has trailed the rest of the nation. Both the
state and New York City have experienced long-term structural imbalances between
revenues and expenses, and have repeatedly relied substantially on non-recurring
measures to achieve budget balance. The pressures that contribute to budgetary
problems at both the state and local level include:

o the high combined state and local tax burden;

o a decline in manufacturing jobs, leading to above-average unemployment;

o sensitivity to the financial services industry; and

o dependence on federal aid.

State Government

The State government frequently has difficulty approving budgets on time. Budget
gaps of $1 billion and $4 billion are projected for the next two years. The
State's general obligation bonds are rated A by Standard & Poor's and A2 by
Moody's. There is $37 billion of state-related debt outstanding.

New York City Government

Even though the City had budget surpluses each year from 1981, budget gaps of $2
billion are projected for each of the next three years. New York City faces
fiscal pressures from:

o aging public facilities that need repair or replacement;

o welfare and medical costs;

o expiring labor contracts; and

o a high and increasing debt burden.

The City requires substantial state aid, and its fiscal strength depends heavily
on the securities industry. Its general obligation bonds are rated A-by Standard
& Poor's and A3 by Moody's.

PENNSYLVANIA RISKS

Generally

Pennsylvania and many of its municipalities (including Philadelphia) have
undergone an economic decline:

o coal, steel, railroads and other heavy industry historically associated
with the Commonwealth has given way to increased competition from foreign
producers.

o agriculture and related industries are still an important part of the
Commonwealth's economy.

o Recently, however, service sector industries (trade, medical and health
services, education and financial services) have provided new sources of
growth.

State and Local Governments

Historically, both the Commonwealth and the City of Philadelphia have
experienced serious revenue shortfalls. At the same time, rising demands for
state and local programs and services (particularly medical assistance and cash
assistance programs) have lead to increased spending.

o In recent years, both the Commonwealth and the City of Philadelphia have
tried to balance their budgets with a mix of tax increases and spending
cuts.

o Philadelphia has considered significant service cuts and privatization of
certain services which it has provided to date.

o In 1991, the Commonwealth created the Pennsylvania Inter-Governmental

16
<PAGE>
Cooperation Authority ('PICA') which it authorized to issue debt to cover
Philadelphia's budget shortfalls, eliminate the City's projected deficits
and fund its capital spending. PICA issued approximately $1.76 billion of
Special Revenue Bonds on Philadelphia's behalf. Its power to issue bonds
on Philadelphia's behalf expired at the end of 1996; as of June 30, 1997,
approximately $1.1 billion in PICA Special Revenue Bonds were outstanding.

o Pennsylvania's general obligation bonds are currently rated A1 by Moody's
and AA-by Standard & Poor's. Philadelphia's general obligation bonds are
rated Baa by Moody's and BBB by Standard & Poor's. There can be no
assurance that these ratings will not be lowered.

BOND QUALITY RISK

A reduction in a bond's rating may decrease its value and, indirectly, the value
of your investment in the Fund.

INSURANCE RELATED RISK

Some bonds are backed by insurance companies (as shown under Portfolios).
Insurance policies generally make payments only according to a bond's original
payment schedule and do not make early payments when a bond defaults or becomes
taxable. Although the federal government does not regulate the insurance
business, various state laws and federal initiatives and tax law changes could
significantly affect the insurance business. The claims-paying ability of the
insurance companies is generally rated A or better by Standard & Poor's or
another nationally recognized rating organization. The insurance company ratings
are subject to change at any time at the discretion of the rating agencies.

LITIGATION AND LEGISLATION RISKS

We do not know of any pending litigation that might have a material adverse
effect upon the Fund.

Future tax legislation could affect the value of the portfolio by:
o limiting real property taxes,
o reducing tax rates,
o imposing a flat or other form of tax, or
o exempting investment income from tax.

SELLING OR EXCHANGING UNITS

You can sell your units at any time for a price based on net asset value. Your
net asset value is calculated each business day by:
o adding the value of the bonds, net accrued interest, cash and any other
Fund assets;
o subtracting accrued but unpaid Fund expenses, unreimbursed Trustee
advances, cash held to buy back units or for distribution to investors and
any other Fund liabilities; and
o dividing the result by the number of outstanding units.

Your net asset value when you sell may be more or less than your cost because of
sales fees, market movements and changes in the portfolio.

SPONSORS' SECONDARY MARKET

While we are not obligated to do so, we will buy back units at net asset value
without any other fee or charge. We may resell the units to other buyers or to
the Trustee. You should consult your financial professional for current market
prices to determine if other broker-dealers or banks are offering higher prices.

We have maintained the secondary market continuously for over 25 years, but we
could

17
<PAGE>
discontinue it without prior notice for any business reason.

SELLING UNITS TO THE TRUSTEE

Regardless of whether we maintain a secondary market, you can sell your units to
the Trustee at any time by sending the Trustee a letter (with any outstanding
certificates if you hold Unit certificates). You must properly endorse your
certificates (or execute a written transfer instrument with signatures
guaranteed by an eligible institution). Sometimes, additional documents are
needed such as a trust document, certificate of corporate authority, certificate
of death or appointment as executor, administrator or guardian.

Within seven days after your request and the necessary documents are received,
the Trustee will mail a check to you. Contact the Trustee for additional
information.

As long as we are maintaining a secondary market, the Trustee will sell your
units to us at a price based on net asset value. If there is no secondary
market, the Trustee may sell your units in the over-the-counter market for a
higher price, but it is not obligated to do so. In that case, you will receive
the net proceeds of the sale.

If the Fund does not have cash available to pay you for units you are selling,
the agent for the Sponsors will select bonds to be sold. Bonds will be selected
based on market and credit factors. These sales could be made at times when the
bonds would not otherwise be sold and may result in your receiving less than the
unit par value and also reduce the size and diversity of the Fund.

There could be a delay in paying you for your units:
o if the New York Stock Exchange is closed (other than customary weekend and
holiday closings);
o if the SEC determines that trading on the New York Stock Exchange is
restricted or that an emergency exists making sale or evaluation of the
bonds not reasonably practicable; and
o for any other period permitted by SEC order.

EXCHANGE OPTION

You may exchange units of certain Defined Asset Funds for units of this Fund at
a maximum exchange fee of 1.90%. You may exchange units of this Fund for units
of certain other Defined Asset Funds at a reduced sales fee if your investment
goals change. To exchange units, you should talk to your financial professional
about what funds are exchangeable, suitable and currently available.

Normally, an exchange is taxable and you must recognize any gain or loss on the
exchange. However, the IRS may try to disallow a loss if the portfolios of the
two funds are not materially different; you should consult your own tax adviser.

We may amend or terminate this exchange option at any time without notice.

HOW THE FUND WORKS

PRICING

The price of a unit includes interest accrued on the bonds, less expenses, from
the initial most recent Record Day up to, but not including, the settlement
date, which is usually three

18
<PAGE>
business days after the purchase date of the unit.

A portion of the price of a unit consists of cash so that the Trustee can
provide you with regular monthly income. When you sell your units you will
receive your share of this cash.

EVALUATIONS

An independent Evaluator values the bonds on each business day (excluding
Saturdays, Sundays and the following holidays as observed by the New York Stock
Exchange: New Year's Day, Presidents' Day, Martin Luther King, Jr. Day, Good
Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving and Christmas).
Bond values are based on current bid or offer prices for the bonds or comparable
bonds. In the past, the difference between bid and offer prices of publicly
offered tax-exempt bonds has ranged from 0.5% of face amount on actively traded
issues to 3.5% on inactively traded issues; the difference has averaged between
1 and 2%.

INCOME

The Trustee credits interest to an Income Account and other receipts to a
Capital Account. The Trustee may establish a Reserve Account by withdrawing from
these accounts amounts it considers appropriate to pay any material liability.
These accounts do not bear interest.

EXPENSES

The Trustee is paid monthly. It also benefits when it holds cash for the Fund in
non-interest bearing accounts. The Trustee may also receive additional amounts:
o to reimburse the Trustee for the Fund's operating expenses;
o for extraordinary services and costs of indemnifying the Trustee and the
Sponsors;
o costs of actions taken to protect the Fund and other legal fees and
expenses;
o expenses for keeping the Fund's registration statement current; and
o Fund termination expenses and any governmental charges.

The Sponsors are currently reimbursed up to 45 cents per $1,000 face amount
annually for providing portfolio supervisory, bookkeeping and administrative
services and for any other expenses properly chargeable to the Fund. Legal,
typesetting, electronic filing and regulatory filing fees and expenses
associated with updating the Portfolio's registration statement yearly are also
now chargeable to the Portfolio. While this fee may exceed the amount of these
costs and expenses attributable to this Fund, the total of these fees for all
Series of Defined Asset Funds will not exceed the aggregate amount attributable
to all of these Series for any calendar year. The Fund also pays the Evaluator's
fees.

The Trustee's, Sponsors' and Evaluator's fees may be adjusted for inflation
without investors' approval.

The Sponsors will pay advertising and selling expenses at no charge to the Fund.
If Fund expenses exceed initial estimates, the Fund will owe the excess. The
Trustee has a lien on Fund assets to secure reimbursement of Fund expenses and
may sell bonds if cash is not available.

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<PAGE>
PORTFOLIO CHANGES

The Sponsors and Trustee are not liable for any default or defect in a bond; if
a contract to buy any bond.

Unlike a mutual fund, the portfolio is designed to remain intact and we may keep
bonds in the portfolio even if their credit quality declines or other adverse
financial circumstances occur. However, we may sell a bond in certain cases if
we believe that certain adverse credit conditions exist or if a bond becomes
taxable.

If we maintain a secondary market in units but are unable to sell the units that
we buy in the secondary market, we will redeem units, which will affect the size
and composition of the portfolio. Units offered in the secondary market may not
represent the same face amount of bonds that they did originally.

We decide whether or not to offer units for sale that we acquire in the
secondary market after reviewing:
o diversity of the portfolio;
o size of the Fund relative to its original size;
o ratio of Fund expenses to income;
o current and long-term returns;
o degree to which units may be selling at a premium over par; and
o cost of maintaining a current prospectus.

FUND TERMINATION

The Fund will terminate following the stated maturity or sale of the last bond
in the portfolio. The Fund may also terminate earlier with the consent of
investors holding 51% of the units or if total assets of the Fund have fallen
below 40% of the face amount of bonds deposited. We will decide whether to
terminate the Fund early based on the same factors used in deciding whether or
not to offer units in the secondary market.

When the Fund is about to terminate you will receive a notice, and you will be
unable to sell your units after that time. On or shortly before termination, we
will sell any remaining bonds, and you will receive your final distribution. Any
bond that cannot be sold at a reasonable price may continue to be held by the
Trustee in a liquidating trust pending its final sale.

You will pay your share of the expenses associated with termination, including
brokerage costs in selling bonds. This may reduce the amount you receive as your
final distribution.

CERTIFICATES

Certificates for units are issued on request. You may transfer certificates by
complying with the requirements for redeeming certificates, described above. You
can replace lost or mutilated certificates by delivering satisfactory indemnity
and paying the associated costs.

TRUST INDENTURE

The Fund is a 'unit investment trust' governed by a Trust Indenture, a contract
among the Sponsors, the Trustee and the Evaluator, which sets forth their duties
and obligations and your rights. A copy of the Indenture is available to you on
request to the Trustee. The following summarizes certain provisions of the
Indenture.

The Sponsors and the Trustee may amend the Indenture without your consent:
o to cure ambiguities;

20
<PAGE>
o to correct or supplement any defective or inconsistent provision;
o to make any amendment required by any governmental agency; or
o to make other changes determined not to be materially adverse to your best
interest (as determined by the Sponsors).
Investors holding 51% of the units may amend the Indenture. Every investor must
consent to any amendment that changes the 51% requirement. No amendment may
reduce your interest in the Fund without your written consent.

The Trustee may resign by notifying the Sponsors. The Sponsors may remove the
Trustee without your consent if:
o it fails to perform its duties and the Sponsors determine that its
replacement is in your best interest; or
o it becomes incapable of acting or bankrupt or its affairs are taken over by
public authorities.
Investors holding 51% of the units may remove the Trustee. The Evaluator may
resign or be removed by the Sponsors and the Trustee without the consent of
investors. The resignation or removal of either becomes effective when a
successor accepts appointment. The Sponsors will try to appoint a successor
promptly; however, if no successor has accepted within 30 days after notice of
resignation, the resigning Trustee or Evaluator may petition a court to appoint
a successor.

Any Sponsor may resign as long as one Sponsor with a net worth of $2 million
remains and agrees to the resignation. The remaining Sponsors and the Trustee
may appoint a replacement. If there is only one Sponsor and it fails to perform
its duties or becomes bankrupt the Trustee may:
o remove it and appoint a replacement Sponsor;
o liquidate the Fund; or
o continue to act as Trustee without a Sponsor.

Merrill Lynch, Pierce, Fenner & Smith Incorporated acts as agent for the
Sponsors.

The Trust Indenture contains customary provisions limiting the liability of the
Trustee, the Sponsors and the Evaluator.

LEGAL OPINION

Davis Polk & Wardwell, 450 Lexington Avenue, New York, New York 10017, as
counsel for the Sponsors, has given an opinion that the units are validly
issued. Special counsel located in the relevant states have given state and
local tax opinions.

AUDITORS

Deloitte & Touche LLP, 2 World Financial Center, New York, New York 10281,
independent accountants, audited the Statements of Condition included in this
prospectus.

SPONSORS

The Sponsors are:

MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED (a wholly-owned subsidiary of
Merrill Lynch & Co., Inc.)
P.O. Box 9051,
Princeton, NJ 08543-9051

SALOMON SMITH BARNEY INC. (an indirectly wholly-owned subsidiary of Citigroup
Inc.)
388 Greenwich Street--23rd Floor,
New York, NY 10013
DEAN WITTER REYNOLDS INC. (a principal operating subsidiary of Morgan Stanley

21
<PAGE>
Dean Witter & Co.)
Two World Trade Center--59th Floor,
New York, NY 10048
PRUDENTIAL SECURITIES INCORPORATED (an
indirect wholly-owned subsidiary of the
Prudential Insurance Company of America)
One New York Plaza
New York, NY 10292
PAINEWEBBER INCORPORATED (a wholly-owned subsidiary of PaineWebber Group Inc.)
1285 Avenue of the Americas,
New York, NY 10019

Each Sponsor is a Delaware corporation and it, or its predecessor, has acted as
sponsor to many unit investment trusts. As a registered broker-dealer each
Sponsor buys and sells securities (including investment company shares) for
others (including investment companies) and participates as an underwriter in
various selling groups.

TRUSTEE

The Chase Manhattan Bank, Unit Investment Trust Department, 4 New York
Plaza--6th Floor, New York, New York 10004, is the Trustee.

It is supervised by the Federal Deposit Insurance Corporation, the Board of
Governors of the Federal Reserve System and New York State banking authorities.

UNDERWRITERS' AND SPONSORS' PROFITS

Underwriters receive sales charges when they sell units. The Sponsors also
realized a profit or loss on the initial date of deposit of the bonds. Any cash
made available by you to the Sponsors before the settlement date for those units
may be used in the Sponsors' businesses to the extent permitted by federal law
and may benefit the Sponsors.

A Sponsor or Underwriter may realize profits or sustain losses on bonds in the
Fund which were acquired from underwriting syndicates of which it was a member.

In maintaining a secondary market, the Sponsors will also realize profits or
sustain losses in the amount of any difference between the prices at which they
buy units and the prices at which they resell or redeem them.

PUBLIC DISTRIBUTION

The Sponsors do not intend to qualify units for sale in any foreign countries.
This prospectus does not constitute an offer to sell units in any country where
units cannot lawfully be sold.

CODE OF ETHICS

Merrill Lynch, as agent for the Sponsors, has adopted a code of ethics requiring
preclearance and reporting of personal securities transactions by its employees
with access to information on portfolio transactions. The goal of the code is to
prevent fraud, deception or misconduct against the Fund and to provide
reasonable standards of conduct.

YEAR 2000 ISSUES

Many computer systems were designed in such a way that they may be unable to
distinguish between the year 2000 and the year 1900 (commonly known as the 'Year
2000 Problem'). We do not expect that the computer system changes necessary to
prepare for the Year 2000 will cause any major operational difficulties for the
Fund. 'The Year 2000 Problem may adversely affect the issuers of the securities
contained in the Portfolio, but we cannot predict whether any

22
<PAGE>
impact will be material to the Portfolio as a whole.'

TAXES

The following summary describes some of the important income tax consequences of
holding units. It assumes that you are not a dealer, financial institution,
insurance company or other investor with special circumstances. You should
consult your own tax adviser about your particular circumstances.

At the date of issue of each bond, counsel for the issuer delivered an opinion
to the effect that interest on the bond is exempt from regular federal income
tax. However, interest may be subject to state and local taxes and federal
alternative minimum tax. Neither we nor our counsel have reviewed the issuance
of the bonds, related proceedings or the basis for the opinions of counsel for
the issuers. We cannot assure you that the issuer (or other users) have complied
or will comply with any requirements necessary for a bond to be tax-exempt. If
any of the bonds were determined not to be tax-exempt, you could be required to
pay income tax for current and prior years, and if the Fund were to sell the
bond, it might have to sell it at a substantial discount.

In the opinion of our counsel, under existing law:

GENERAL TREATMENT OF THE FUND AND YOUR INVESTMENT

The Fund will not be taxed as a corporation for federal income tax purposes, and
you will be considered to own directly your share of each bond in the Fund.

INCOME OR LOSS UPON DISPOSITION

When all or part of your share of a bond is disposed of (for example, when the
Fund sells, exchanges or redeems a bond or when you sell or exchange your
units), you will generally recognize capital gain or loss. Your gain, however,
will generally be ordinary income to the extent of any accrued 'market
discount'. Generally you will have market discount to the extent that your basis
in a bond when you purchase a unit is less than its stated redemption price at
maturity (or, if it is an original issue discount bond, the issue price
increased by original issue discount that has accrued on the bond before your
purchase). You should consult your tax adviser in this regard.

If your net long-term capital gains exceed your net short-term capital losses,
the excess may be subject to tax at a lower rate than ordinary income. Any
capital gain from the Fund will be long-term if you are considered to have held
your investment on each bond for more than one year and short-term if you held
it for one year or less. If you are an individual and sell your units after
holding them for more than one year, you may be entitled to a 20% maximum
federal tax rate on any resulting gains. Consult your tax adviser in this
regard. Because the deductibility of capital losses is subject to limitations,
you may not be able to deduct all of your capital losses.

YOUR BASIS IN THE BONDS

Your aggregate basis in the bonds will be equal to the cost of your units,
including any sales charges and the organizational expenses you pay, adjusted to
reflect any accruals of 'original issue discount,' 'acquisition

23
<PAGE>
premium' and 'bond premium'. You should consult your tax adviser in this regard.

EXPENSES

If you are not a corporate investor, you will not be entitled to a deduction for
your share of fees and expenses of the Fund. Also, if you borrowed money in
order to purchase or carry your units, you will not be able to deduct the
interest on this borrowing for federal income tax purposes. The IRS may treat
your purchase of units as made with borrowed money even if the money is not
directly traceable to the purchase of units.

STATE AND LOCAL TAXES

Under the income tax laws of the State and City of New York, the Fund will not
be taxed as a corporation. If you are a New York taxpayer, your income from the
Fund will not be tax-exempt in New York except to the extent that the income is
earned on bonds that are tax-exempt for New York purposes. Depending on where
you live, your income from the Fund may be subject to state and local taxation.
You should consult your tax adviser in this regard.

MICHIGAN TAXES

In the opinion of Miller, Canfield, Paddock and Stone, P.L.C. Bloomfield Hills,
Michigan, special counsel on Michigan tax matters:

Under the income tax laws of the State of Michigan, the Fund will not be taxed
as a corporation. If you are a Michigan taxpayer, your interest income from the
Fund will not be tax-exempt in Michigan except to the extent that the interest
is earned on bonds that are tax-exempt for Michigan purposes. Capital gain
distributions and capital gain or loss on your Fund units themselves will be
subject to Michigan income tax. Depending on where you live, your income from
the Fund may be subject to state and local taxation. You should consult your tax
adviser in this regard.

PENNSYLVANIA TAXES

In the opinion of Drinker Biddle & Reath LLP, Philadelphia, Pennsylvania,
special counsel on Pennsylvania tax matters:

The Pennsylvania Trust will not be taxed as a corporation under the current
income tax laws of Pennsylvania. Your income from the Trust may be subject to
taxation depending on where you live. If you are a Pennsylvania taxpayer your
interest income from the Trust will be tax exempt to the extent that income is
earned on bonds that are tax exempt for Pennsylvania purposes. However, gains on
the sale of bonds by the Trust or on the sale of your Units will be subject to
Pennsylvania income tax. If you are a Philadelphia resident you may be subject
to the Philadelphia school district tax on any gains realized from the sale of
bonds by the Trust or the sale of Units by you to the extent either the bonds or
Units have been held for six months or less. You should consult your tax adviser
as to the consequences to you with respect to any investment you make in the
Trust.

SUPPLEMENTAL INFORMATION

You can receive at no cost supplemental information about the Fund by calling
the Trustee. The supplemental information includes more detailed risk disclosure
about the types of bonds that may be in the Fund's portfolios, general risk
disclosure concerning any insurance securing certain bonds, and general
information about the structure and operation of the Fund. The supplemental
information is also available from the SEC.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND, MULTISTATE SERIES - 51
(MICHIGAN, NEW YORK AND PENNSYLVANIA TRUSTS)
DEFINED ASSET FUNDS

REPORT OF INDEPENDENT ACCOUNTANTS

The Sponsors, Trustee and Holders
of Municipal Investment Trust Fund,
Multistate Series - 51 (Michigan, New York and
Pennsylvania Trusts), Defined Asset Funds:

We have audited the accompanying statements of condition of
Municipal Investment Trust Fund, Multistate Series - 51
(Michigan, New York and Pennsylvania Trusts), Defined Asset
Funds, including the portfolios, as of October 31, 1998 and
the related statements of operations and of changes in net
assets for the years ended October 31, 1998, 1997 and 1996.
These financial statements are the responsibility of the Trustee.
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. Securities owned at October
31, 1998, as shown in such portfolios, were confirmed to us
by The Chase Manhattan Bank, the Trustee. An audit also
includes assessing the accounting principles used and
significant estimates made by the Trustee, as well as
evaluating the overall financial statement presentation.
We believe that our 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 Municipal Investment Trust Fund,
Multistate Series - 51 (Michigan, New York and Pennsylvania
Trusts) Defined Asset Funds, at October 31, 1998 and the
results of their operations and changes in their net assets
for the above stated years in conformity with generally
accepted accounting principles.

DELOITTE & TOUCHE LLP

New York, N.Y.
December 14, 1998

D - 1.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (MICHIGAN TRUST),
DEFINED ASSET FUNDS

STATEMENT OF CONDITION
As of October 31, 1998

<TABLE>
<S> <C> <C>
TRUST PROPERTY:
Investment in marketable securities -
at value (cost $ 3,093,085 )(Note 1)......... $ 3,249,591
Accrued interest ............................... 69,405
Cash - principal ............................... 4,801
-----------
Total trust property ......................... 3,323,797

LESS LIABILITIES:
Income advance from Trustee..................... $ 32,373
Accrued Sponsors' fees ......................... 1,012 33,385
----------- -----------

NET ASSETS, REPRESENTED BY:
3,159 units of fractional undivided
interest outstanding (Note 3)................ 3,254,392

Undistributed net investment income ............ 36,020 $ 3,290,412
----------- ===========

UNIT VALUE ($ 3,290,412 / 3,159 units )........... $ 1,041.60
===========

</TABLE>

See Notes to Financial Statements.

D - 2.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (MICHIGAN TRUST),
DEFINED ASSET FUNDS

STATEMENTS OF OPERATIONS
<TABLE>
<CAPTION>

Years Ended October 31,
1998 1997 1996
---- ---- ----

<S> <C> <C> <C>
INVESTMENT INCOME:
Interest income ........................ $ 172,988 $ 175,750 $ 175,749
Trustee's fees and expenses ............ (5,010) (5,068) (4,835)
Sponsors' fees ......................... (1,212) (1,181) (1,169)
------------------------------------------------
Net investment income .................. 166,766 169,501 169,745
------------------------------------------------

REALIZED AND UNREALIZED GAIN (LOSS)
ON INVESTMENTS:
Realized gain on
securities sold or redeemed .......... 1,184
Unrealized appreciation (depreciation)
of investments ....................... 120,406 134,457 (20,652)
------------------------------------------------
Net realized and unrealized
gain (loss) on investments ........... 121,590 134,457 (20,652)
------------------------------------------------

NET INCREASE IN NET ASSETS
RESULTING FROM OPERATIONS .............. $ 288,356 $ 303,958 $ 149,093
================================================

</TABLE>

See Notes to Financial Statements.

D - 3.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (MICHIGAN TRUST),
DEFINED ASSET FUNDS

STATEMENTS OF CHANGES IN NET ASSETS
<TABLE>
<CAPTION>

Years Ended October 31,
1998 1997 1996
---- ---- ----

<S> <C> <C> <C>
OPERATIONS:
Net investment income .................. $ 166,766 $ 169,501 $ 169,745
Realized gain on
securities sold or redeemed .......... 1,184
Unrealized appreciation (depreciation)
of investments ....................... 120,406 134,457 (20,652)
------------------------------------------------
Net increase in net assets
resulting from operations ............ 288,356 303,958 149,093

INCOME DISTRIBUTIONS TO
HOLDERS (Note 2)....................... (166,724) (169,553) (169,650)
------------------------------------------------

SHARE TRANSACTIONS:
Redemption amounts - income ............ (1,095)
Redemption amounts - principal ......... (91,383)
------------------------------------------------
Total share transactions ............... (92,478)
------------------------------------------------

NET INCREASE (DECREASE) IN NET ASSETS .... 29,154 134,405 (20,557)

NET ASSETS AT BEGINNING OF YEAR .......... 3,261,258 3,126,853 3,147,410
------------------------------------------------
NET ASSETS AT END OF YEAR ................ $ 3,290,412 $ 3,261,258 $ 3,126,853
================================================
PER UNIT:
Income distributions during
year ................................. $ 52.08 $ 52.17 $ 52.20
================================================
Net asset value at end of
year ................................. $ 1,041.60 $ 1,003.46 $ 962.11
================================================
TRUST UNITS:
Redeemed during year ................... 91
Outstanding at end of year ............. 3,159 3,250 3,250
================================================

</TABLE>

See Notes to Financial Statements.

D - 4.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (MICHIGAN TRUST),
DEFINED ASSET FUNDS

NOTES TO FINANCIAL STATEMENTS

1. SIGNIFICANT ACCOUNTING POLICIES

The Fund is registered under the Investment Company Act of 1940 as a Unit
Investment Trust. The following is a summary of significant accounting
policies consistently followed by the Fund in the preparation of its
financial statements. The policies are in conformity with generally
accepted accounting principles.

(A) Securities are stated at value as determined by the
Evaluator based on bid side evaluations for the securities.
See "How to Sell Units - Trustee's Redemption of Units"
in this Prospectus, Part B.

(B) The Fund is not subject to income taxes. Accordingly, no
provision for such taxes is required.

2. DISTRIBUTIONS

A distribution of net investment income is made to Holders each month.
Receipts other than interest, after deductions for redemptions and
applicable expenses, are distributed as explained in "Income, Distributions
and Reinvestment - Distributions" in this Prospectus, Part B.

3. NET CAPITAL
<TABLE>
<S> <C>

Cost of 3,159 units at Date of Deposit ..................... $ 3,244,828
Less sales charge .......................................... 146,009
-----------
Net amount applicable to Holders ........................... 3,098,819
Redemptions of units - net cost of 91 units redeemed
less redemption amounts (principal)....................... (2,117)
Realized gain on securities sold or redeemed ............... 1,184
Unrealized appreciation of investments...................... 156,506
-----------

Net capital applicable to Holders .......................... $ 3,254,392
===========

</TABLE>

4. INCOME TAXES

As of October 31, 1998, unrealized appreciation of investments, based on
cost for Federal income tax purposes, aggregated $156,506, all of which
related to appreciated securities. The cost of investment securities for
Federal income tax purposes was $3,093,085 at October 31, 1998.

D - 5.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (MICHIGAN TRUST) (INSURED),
DEFINED ASSET FUNDS

PORTFOLIO
As of October 31, 1998

Rating of Optional
Portfolio No. and Title of Issues Face Redemption
Securities (1) (4) Amount Coupon Maturities(3) Provisions(3) Cost Value(2)
---------- --------- ----------- ----------- ------------ ------------ ---------- ---------

<S> <C> <C> <C> <C> <C> <C> <C>
1 Anchor Bay Sch. Dist., Counties of AAA $ 155,000 5.550 % 2019 05/01/03 $ 155,000 $ 162,886
Macomb and St. Clair, MI, 1993 Sch. @ 101.500
Bldg. and Site Bonds (G.O. Unlimited
Tax) (Financial Guaranty Ins.)

2 Caledonia Comm. Schools, Counties of AAA 500,000 5.500 2022 05/01/03 496,420 523,615
Kent, Allegan and Barry, MI, 1993 Rfdg. @ 102.000
Bonds (G.O. Unlimited Tax) (AMBAC Ins.)

3 County of Calhoun, MI, Western Calhoun AAA 500,000 5.375 2018 11/01/03 491,550 512,355
Cnty. Sanitary Swr. Sys. Number 1 @ 101.500
(Township of Emmett), Rfdg. Bonds
(AMBAC Ins.)

4 Cnty. of Jackson, MI, Hosp. Fin. Auth., AAA 500,000 5.250 2023 06/01/03 474,875 502,460
Hosp. Rev. Rfdg. Bonds (W.A. Foote Mem. @ 102.000
Hosp.), Ser. 1993 A (Financial Guaranty
Ins.)

5 Livonia Pub. Schools, Cnty. of Wayne, AAA 500,000 5.500 2021 05/01/03 500,000 522,475
MI, 1993 Rfdg. Bonds (G.O. Unlimited @ 102.000
Tax) (Financial Guaranty Ins.)

6 State of Michigan, State Trunk Line AAA 500,000 5.500 2021 10/01/02 496,435 519,035
Fund Bonds, Ser. 1992 A (MBIA Ins.) @ 100.000

7 Charter County of Wayne, MI, Arpt. Rev. AAA 500,000 5.250 2021 12/01/03 478,805 506,765
Rfdg. Bonds (Detroit Metro. Wayne Cnty. @ 102.000
Arpt.), Subordinate Lien, Ser. 1993 C
(MBIA Ins.)

--------- --------- ---------
TOTAL $ 3,155,000 $ 3,093,085 $ 3,249,591
========= ========= =========

See Notes to Portfolios on page D - 17.

</TABLE>

D - 6.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (NEW YORK TRUST),
DEFINED ASSET FUNDS

STATEMENT OF CONDITION
As of October 31, 1998

<TABLE>
<S> <C> <C>
TRUST PROPERTY:
Investment in marketable securities -
at value (cost $ 5,909,311 )(Note 1)......... $ 6,128,768
Accrued interest ............................... 88,881
Prepaid Trustee's fees and expenses ............ 788
Cash - principal ............................... 2,020
-----------
Total trust property ......................... 6,220,457

LESS LIABILITIES:
Income advance from Trustee..................... $ 13,990
Accrued Sponsors' fees ......................... 1,874 15,864
----------- -----------

NET ASSETS, REPRESENTED BY:
5,945 units of fractional undivided
interest outstanding (Note 3)................ 6,130,788

Undistributed net investment income ............ 73,805 $ 6,204,593
----------- ===========

UNIT VALUE ($ 6,204,593 / 5,945 units )........... $ 1,043.67
===========

</TABLE>

See Notes to Financial Statements.

D - 7.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (NEW YORK TRUST),
DEFINED ASSET FUNDS

STATEMENTS OF OPERATIONS
<TABLE>
<CAPTION>

Years Ended October 31,
1998 1997 1996
---- ---- ----

<S> <C> <C> <C>
INVESTMENT INCOME:
Interest income ........................ $ 321,672 $ 322,874 $ 322,874
Trustee's fees and expenses ............ (7,328) (7,309) (6,896)
Sponsors' fees ......................... (2,244) (2,180) (2,158)
------------------------------------------------
Net investment income .................. 312,100 313,385 313,820
------------------------------------------------

REALIZED AND UNREALIZED GAIN (LOSS)
ON INVESTMENTS:
Realized gain on
securities sold or redeemed .......... 3,446
Unrealized appreciation (depreciation)
of investments ....................... 236,770 238,353 (36,057)
------------------------------------------------
Net realized and unrealized
gain (loss) on investments ........... 240,216 238,353 (36,057)
------------------------------------------------

NET INCREASE IN NET ASSETS
RESULTING FROM OPERATIONS .............. $ 552,316 $ 551,738 $ 277,763
================================================

</TABLE>

See Notes to Financial Statements.

D - 8.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (NEW YORK TRUST),
DEFINED ASSET FUNDS

STATEMENTS OF CHANGES IN NET ASSETS
<TABLE>
<CAPTION>

Years Ended October 31,
1998 1997 1996
---- ---- ----

<S> <C> <C> <C>
OPERATIONS:
Net investment income .................. $ 312,100 $ 313,385 $ 313,820
Realized gain on
securities sold or redeemed .......... 3,446
Unrealized appreciation (depreciation)
of investments ....................... 236,770 238,353 (36,057)
------------------------------------------------
Net increase in net assets
resulting from operations ............ 552,316 551,738 277,763

INCOME DISTRIBUTIONS TO
HOLDERS (Note 2)....................... (312,062) (313,500) (313,680)
------------------------------------------------

SHARE TRANSACTIONS:
Redemption amounts - income ............ (684)
Redemption amounts - principal ......... (55,683)
------------------------------------------------
Total share transactions ............... (56,367)
------------------------------------------------

NET INCREASE (DECREASE) IN NET ASSETS .... 183,887 238,238 (35,917)

NET ASSETS AT BEGINNING OF YEAR .......... 6,020,706 5,782,468 5,818,385
------------------------------------------------
NET ASSETS AT END OF YEAR ................ $ 6,204,593 $ 6,020,706 $ 5,782,468
================================================
PER UNIT:
Income distributions during
year ................................. $ 52.21 $ 52.25 $ 52.28
================================================
Net asset value at end of
year ................................. $ 1,043.67 $ 1,003.45 $ 963.74
================================================
TRUST UNITS:
Redeemed during year ................... 55
Outstanding at end of year ............. 5,945 6,000 6,000
================================================

</TABLE>

See Notes to Financial Statements.

D - 9.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (NEW YORK TRUST),
DEFINED ASSET FUNDS

NOTES TO FINANCIAL STATEMENTS

1. SIGNIFICANT ACCOUNTING POLICIES

(A) Securities are stated at value as determined by the
Evaluator based on bid side evaluations for the securities.
See "How to Sell Units - Trustee's Redemption of Units"
in this Prospectus, Part B.

(B) The Fund is not subject to income taxes. Accordingly, no
provision for such taxes is required.

2. DISTRIBUTIONS

3. NET CAPITAL
<TABLE>
<S> <C>

Cost of 5,945 units at Date of Deposit ..................... $ 6,187,306
Less sales charge .......................................... 278,404
-----------
Net amount applicable to Holders ........................... 5,908,902
Redemptions of units - net cost of 55 units redeemed
less redemption amounts (principal)....................... (1,017)
Realized gain on securities sold or redeemed ............... 3,446
Unrealized appreciation of investments...................... 219,457
-----------

Net capital applicable to Holders .......................... $ 6,130,788
===========

</TABLE>

4. INCOME TAXES

As of October 31, 1998, unrealized appreciation of investments, based on
cost for Federal income tax purposes, aggregated $219,457, all of which
related to appreciated securities. The cost of investment securities for
Federal income tax purposes was $5,909,311 at October 31, 1998.

D - 10.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (NEW YORK TRUST) (INSURED),
DEFINED ASSET FUNDS

PORTFOLIO
As of October 31, 1998

<S> <C> <C> <C> <C> <C> <C> <C>
1 Power Auth. of the State of New York, AAA $ 545,000 5.250 % 2018(5) 01/01/03 $ 537,643 $ 584,714
Gen. Purpose Bonds, Ser. CC (Financial @ 102.000
Guaranty Ins.)

2 The City of New York, NY, G.O. Bonds, AAA 900,000 5.375 2020 10/01/03 890,460 923,733
Fiscal 1993 Ser. C (AMBAC Ins.) @ 101.500

3 New York City, NY, Mun. Wtr. Fin. AAA 900,000 5.500 2020 06/15/02 903,015 931,878
Auth., Wtr. and Swr. Sys. Rev. Bonds, @ 100.000
Fiscal 1992 Ser. A (MBIA Ins.)

4 The Port Auth. of New York and New AAA 900,000 5.250 2021 07/15/03 893,448 914,679
Jersey, Consolidated Bonds, Eighty- @ 101.000
Seventh Ser. (Finacial Guaranty Ins.)

5 Triborough Bridge and Tunnel Auth., NY, AAA 720,000 5.500 2017(5) 01/01/02 722,290 758,822
Spec. Oblig. Bonds, Ser. 1992 @ 100.000
(AMBAC Ins.)
180,000 5.500 2017 01/01/02 180,572 183,811
@ 100.000

6 New York State Urban Dev. Corp., Corr. AAA 900,000 5.250 2018 01/01/03 881,883 912,231
Fac. Rev. Bonds, 1993 Rfdg. Ser. @ 102.000
(AMBAC Ins.)

7 New York State Med. Care Fac. Fin. AAA 900,000 5.500 2021 02/15/02 900,000 918,900
Agency, Mental Hlth. Services, Fac. @ 100.000
Imp. Rev. Bonds, Ser. 1992 A
(Financial Guaranty Ins.)

--------- --------- ---------
TOTAL $ 5,945,000 $ 5,909,311 $ 6,128,768
========= ========= =========

See Notes to Portfolios on page D - 17.

</TABLE>

D - 11.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (PENNSYLVANIA TRUST),
DEFINED ASSET FUNDS

STATEMENT OF CONDITION
As of October 31, 1998

<TABLE>
<S> <C> <C>
TRUST PROPERTY:
Investment in marketable securities -
at value (cost $ 3,302,245 )(Note 1)......... $ 3,458,540
Accrued interest ............................... 66,674
Proceeds receivable from sale of securities .... 164,446
Cash - principal ............................... 16,327
-----------
Total trust property ......................... 3,705,987

LESS LIABILITIES:
Income advance from Trustee..................... $ 20,913
Accrued Sponsors' fees ......................... 1,176
Redemptions payable ............................ 162,636 184,725
----------- -----------

NET ASSETS, REPRESENTED BY:
3,378 units of fractional undivided
interest outstanding (Note 3)................ 3,478,689

Undistributed net investment income ............ 42,573 $ 3,521,262
----------- ===========

UNIT VALUE ($ 3,521,262 / 3,378 units )........... $ 1,042.41
===========

</TABLE>

See Notes to Financial Statements.

D - 12.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (PENNSYLVANIA TRUST),
DEFINED ASSET FUNDS

STATEMENTS OF OPERATIONS
<TABLE>
<CAPTION>

Years Ended October 31,
1998 1997 1996
---- ---- ----

<S> <C> <C> <C>
INVESTMENT INCOME:
Interest income ........................ $ 198,469 $ 210,985 $ 213,983
Trustee's fees and expenses ............ (5,440) (4,970) (5,402)
Sponsors' fees ......................... (1,415) (1,418) (1,433)
------------------------------------------------
Net investment income .................. 191,614 204,597 207,148
------------------------------------------------

REALIZED AND UNREALIZED GAIN (LOSS)
ON INVESTMENTS:
Realized gain (loss) on
securities sold or redeemed .......... 14,149 51 (1,422)
Unrealized appreciation
of investments ....................... 116,550 142,581 2,734
------------------------------------------------
Net realized and unrealized
gain on investments ................. 130,699 142,632 1,312
------------------------------------------------

NET INCREASE IN NET ASSETS
RESULTING FROM OPERATIONS .............. $ 322,313 $ 347,229 $ 208,460
================================================

</TABLE>

See Notes to Financial Statements.

D - 13.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (PENNSYLVANIA TRUST),
DEFINED ASSET FUNDS

STATEMENTS OF CHANGES IN NET ASSETS
<TABLE>
<CAPTION>

Years Ended October 31,
1998 1997 1996
---- ---- ----

<S> <C> <C> <C>
OPERATIONS:
Net investment income .................. $ 191,614 $ 204,597 $ 207,148
Realized gain (loss) on
securities sold or redeemed .......... 14,149 51 (1,422)
Unrealized appreciation
of investments ....................... 116,550 142,581 2,734
------------------------------------------------
Net increase in net assets
resulting from operations ............ 322,313 347,229 208,460
------------------------------------------------
DISTRIBUTIONS TO HOLDERS (Note 2):
Income ................................ (192,010) (203,974) (207,326)
Principal .............................. (2,634) (4,446)
------------------------------------------------
Total distributions .................... (194,644) (208,420) (207,326)
------------------------------------------------
SHARE TRANSACTIONS:
Redemption amounts - income ............ (5,246) (1,036) (1,103)
Redemption amounts - principal ......... (449,517) (82,959) (99,794)
------------------------------------------------
Total share transactions ............... (454,763) (83,995) (100,897)
------------------------------------------------

NET INCREASE (DECREASE) IN NET ASSETS .... (327,094) 54,814 (99,763)

NET ASSETS AT BEGINNING OF YEAR .......... 3,848,356 3,793,542 3,893,305
------------------------------------------------
NET ASSETS AT END OF YEAR ................ $ 3,521,262 $ 3,848,356 $ 3,793,542
================================================
PER UNIT:
Income distributions during
year ................................. $ 52.34 $ 52.58 $ 52.71
================================================
Principal distributions during
year ................................. $ 0.69 $ 1.14
=====================================
Net asset value at end of
year ................................. $ 1,042.41 $ 1,008.21 $ 972.70
================================================
TRUST UNITS:
Redeemed during year ................... 439 83 100
Outstanding at end of year ............. 3,378 3,817 3,900
================================================

</TABLE>

See Notes to Financial Statements.

D - 14.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (PENNSYLVANIA TRUST),
DEFINED ASSET FUNDS

NOTES TO FINANCIAL STATEMENTS

1. SIGNIFICANT ACCOUNTING POLICIES

(A) Securities are stated at value as determined by the
Evaluator based on bid side evaluations for the securities.
See "How to Sell Units - Trustee's Redemption of Units"
in this Prospectus, Part B.

(B) The Fund is not subject to income taxes. Accordingly, no
provision for such taxes is required.

2. DISTRIBUTIONS

3. NET CAPITAL
<TABLE>
<S> <C>

Cost of 3,378 units at Date of Deposit ..................... $ 3,492,047
Less sales charge .......................................... 157,145
-----------
Net amount applicable to Holders ........................... 3,334,902
Redemptions of units - net cost of 622 units redeemed
less redemption amounts (principal)....................... (18,206)
Realized gain on securities sold or redeemed ............... 12,778
Principal distributions .................................... (7,080)
Unrealized appreciation of investments...................... 156,295
-----------

Net capital applicable to Holders .......................... $ 3,478,689
===========

</TABLE>

4. INCOME TAXES

As of October 31, 1998, unrealized appreciation of investments, based on
cost for Federal income tax purposes, aggregated $156,295, all of which
related to appreciated securities. The cost of investment securities for
Federal income tax purposes was $3,302,245 at October 31, 1998.

D - 15.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND,
MULTISTATE SERIES - 51 (PENNSYLVANIA TRUST) (INSURED),
DEFINED ASSET FUNDS

PORTFOLIO
As of October 31, 1998

<S> <C> <C> <C> <C> <C> <C> <C>
1 Delaware Cnty. Auth., Commonwealth of AAA $ 440,000 5.500 % 2023 08/01/03 $ 436,779 $ 460,390
Pennsylvania, Univ. Rev. Bonds, @ 102.000
Ser. 1993 (Villanova Univ.) (MBIA Ins.)

2 Pennsylvania Intergovernmental AAA 600,000 5.625 2023 06/15/03 603,276 628,632
Cooperation Auth., Special Tax Rev. @ 100.000
Bonds (City of Philadelphia Funding
Prog.), Ser. of 1993 (MBIA Ins.)

3 Lehigh-Northampton Airport Auth., PA, AAA 240,000 5.500 2023 01/01/04 238,265 251,258
Arpt. Rev. Bonds, Ser. 1993 B @ 102.000
(Allentown-Bethlehem-Easton Intl.
Arpt.) (MBIA Ins.)

4 The Philadelphia Municipal Auth., AAA 410,000 5.625 2018 11/15/03 412,645 428,503
Phila., PA, Lease Rev. Rfdg. Bonds, @ 102.000
Ser. A (Financial Guaranty Ins.)

5 City of Philadelphia, PA, Water and AAA 560,000 5.250 2023 06/15/03 539,655 566,205
Wastewater Rev. Bonds, Ser. 1993 @ 102.000
(MBIA Ins.)

6 Commonwealth of Pennsylvania, Certs. of AAA 500,000 5.000 2015 07/01/03 471,625 497,170
Participation, Ser. 1993 A (AMBAC Ins.) @ 102.000

7 Wayne Cnty., PA, Hosp. and Hlth. AAA 600,000 5.600 2023 07/01/03 600,000 626,382
Facilities Auth., Cnty. Gtd. Hlth. @ 102.000
Facilities Rev. Bonds, Ser. 1993
(Wayne Woodland Manor Proj.) (MBIA Ins)

--------- --------- ---------
TOTAL $ 3,350,000 $ 3,302,245 $ 3,458,540
========= ========= =========

See Notes to Portfolios on page D - 17.

</TABLE>

D - 16.

<PAGE>

MUNICIPAL INVESTMENT TRUST FUND, MULTISTATE SERIES - 51
(MICHIGAN, NEW YORK AND PENNSYLVANIA TRUSTS)
DEFINED ASSET FUNDS

NOTES TO PORTFOLIOS
As of October 31, 1998
<TABLE>
<CAPTION>
<S> <C>
(1) The ratings of the bonds are by Standard & Poor's Ratings Group, or by
Moody's Investors Service, Inc. if followed by "(m)", or by Fitch Investors
Service, Inc. if followed by "(f)"; "NR" indicates that this bond is not
currently rated by any of the above-mentioned rating services. These ratings
have been furnished by the Evaluator but not confirmed with the rating agencies.
See "Description of Ratings" in Part B of this Prospectus.

(2) See Notes to Financial Statements.

(3) Optional redemption provisions, which may be exercised in whole or in part,
are initially at prices of par plus a premium, then subsequently at prices
declining to par. Certain securities may provide for redemption at par prior
or in addition to any optional or mandatory redemption dates or maturity, for
example, through the operation of a maintenance and replacement fund, if
proceeds are not able to be used as contemplated, the project is condemned or
sold or the project is destroyed and insurance proceeds are used to redeem
the securities. Many of the securities are also subject to mandatory sinking
fund redemption commencing on dates which may be prior to the date on which
securities may be optionally redeemed. Sinking fund redemptions are at par
and redeem only part of the issue. Some of the securities have mandatory
sinking funds which contain optional provisions permitting the issuer to
increase the principal amount of securities called on a mandatory redemption
date. The sinking fund redemptions with optional provisions may, and optional
refunding redemptions generally will, occur at times when the redeemed
securities have an offering side evaluation which represents a premium over
par. To the extent that the securities were acquired at a price higher than
the redemption price, this will represent a loss of capital when compared
with the Public Offering Price of the Units when acquired. Distributions will
generally be reduced by the amount of the income which would otherwise have
been paid with respect to redeemed securities and there will be distributed
to Holders any principal amount and premium received on such redemption after
satisfying any redemption requests for Units received by the Fund. The
estimated current return may be affected by redemptions. The tax effect on
Holders of redemptions and related distributions is described under "Taxes"
in this Prospectus, Part B.

(4) All securities are insured, either on an individual basis or by portfolio
insurance, by a municipal bond insurance company which has been assigned
"AAA" claims paying ability by Standard & Poor's. Accordingly, Standard &
Poor's has assigned a "AAA" rating to the securities. Securities covered by
portfolio insurance are rated "AAA" only as long as they remain in the Trust.
See "Risk Factors - Bonds Backed by Letters of Credit or Insurance" in this
Prospectus, Part B.

(5) Bonds with aggregate face amount of $ 1,265,000 of the New York Trust have
been pre-refunded and are expected to be called for redemption on the
optional redemption provision dates shown
</TABLE>

D - 17.

<PAGE>
Defined
Asset FundsSM

HAVE QUESTIONS ? MUNICIPAL INVESTMENT TRUST FUND
Request the most MULTISTATE SERIES--51
recent free Information (A Unit Investment Trust)
Supplement that gives more ---------------------------------------
details about the Fund, This Prospectus does not contain
by calling: complete information about the
The Chase Manhattan Bank investment company filed with the
1-800-323-1508 Securities and Exchange Commission in
Washington, D.C. under the:
o Securities Act of 1933 (file no.
33-50569) and
o Investment Company Act of 1940 (file
no. 811-1777).
TO OBTAIN COPIES AT PRESCRIBED RATES--
WRITE: Public Reference Section of the
Commission
450 Fifth Street, N.W., Washington,
D.C. 20549-6009
CALL: 1-800-SEC-0330.
VISIT: http://www.sec.gov.
---------------------------------------
No person is authorized to give any
information or representations about
this Fund not contained in this
Prospectus or the Information
Supplement, and you should not rely on
any other information.
---------------------------------------
When units of this Fund are no longer
available, this Prospectus may be used
as a preliminary prospectus for a
future series, but some of the
information in this Prospectus will be
changed for that series.
Units of any future series may not be
sold nor may offers to buy be accepted
until that series has become effective
with the Securities and Exchange
Commission. No units can be sold in any
State where a sale would be illegal.

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