EQUITY INVESTOR FUND WESTERN PREMIER PORT DEFINED ASST FUNDS
487, 1998-02-05
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<PAGE>

   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 5, 1998
 
                                                      REGISTRATION NO. 333-41757
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
 
                   ------------------------------------------
 
   
                                AMENDMENT NO. 2
    
                                       TO
 
                                    FORM S-6
 
                   ------------------------------------------
 
                   FOR REGISTRATION UNDER THE SECURITIES ACT
                    OF 1933 OF SECURITIES OF UNIT INVESTMENT
                        TRUSTS REGISTERED ON FORM N-8B-2
 
                   ------------------------------------------
 
A. EXACT NAME OF TRUST:
 
                              EQUITY INVESTOR FUND
                           WESTERN PREMIER PORTFOLIO
   
    
                              DEFINED ASSET FUNDS
 
B. NAMES OF DEPOSITORS:
 
               MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
                           DEAN WITTER REYNOLDS INC.
                            PAINEWEBBER INCORPORATED
 
C. COMPLETE ADDRESSES OF DEPOSITORS' PRINCIPAL EXECUTIVE OFFICES:
 

                          MERRILL LYNCH, PIERCE,
                              FENNER & SMITH
                               INCORPORATED
                            DEFINED ASSET FUNDS
                               P.O. BOX 9051
                         PRINCETON, NJ 08543-9051

 

PAINEWEBBER INCORPORATED
   1285 AVENUE OF THE
        AMERICAS
   NEW YORK, NY 10019                             DEAN WITTER REYNOLDS INC.
                                                       TWO WORLD TRADE
                                                     CENTER--59TH FLOOR
                                                     NEW YORK, NY 10048

 
D. NAMES AND COMPLETE ADDRESSES OF AGENTS FOR SERVICE:
 

                           TERESA KONCICK, ESQ.
                               P.O. BOX 9051
                         PRINCETON, NJ 08543-9051
 
                                COPIES TO:
                          PIERRE DE SAINT PHALLE,
                                   ESQ.
                           450 LEXINGTON AVENUE
                            NEW YORK, NY 10017

 

    ROBERT E. HOLLEY
   1285 AVENUE OF THE
        AMERICAS
   NEW YORK, NY 10019                                DOUGLAS LOWE, ESQ.
                                                  DEAN WITTER REYNOLDS INC.
                                                       TWO WORLD TRADE
                                                     CENTER--59TH FLOOR
                                                     NEW YORK, NY 10048

 
E. TITLE OF SECURITIES BEING REGISTERED:
 
  An indefinite number of Units of Beneficial Interest pursuant to Rule 24f-2
       promulgated under the Investment Company Act of 1940, as amended.
 
F. APPROXIMATE DATE OF PROPOSED SALE TO PUBLIC:
 
 As soon as practicable after the effective date of the registration statement.
 
   
[X] Check box if it is proposed that this filing will become effective upon 
filing on February 5, 1998 pursuant to Rule 487.
    
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                                   DEFINED ASSET FUNDSSM
- --------------------------------------------------------------------------------
 

EQUITY INVESTOR FUND          The objective of this Defined Fund is capital
WESTERN PREMIER               appreciation through investing for a period of
PORTFOLIO                     about two years in a portfolio of common stocks of
(A UNIT INVESTMENT            companies headquartered in seven selected Western
TRUST)                        states, chosen for their potential for growth
- ------------------------------based on a combination of fundamental and
                              valuation measurements.
                              The value of units will fluctuate with the value
                              of the common stocks in the Portfolio and no
                              assurance can be given that the units will
                              appreciate in value. Current dividend income is
                              not an objective of the Fund.
                              Minimum purchase: $250.

 

                               -------------------------------------------------
                               THESE SECURITIES HAVE NOT BEEN APPROVED OR
                               DISAPPROVED BY THE SECURITIES AND EXCHANGE
                               COMMISSION OR ANY STATE SECURITIES COMMISSION NOR
                               HAS THE COMMISSION OR ANY STATE SECURITIES
                               COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY
                               OF THIS DOCUMENT. ANY REPRESENTATION TO THE
SPONSORS:                      CONTRARY IS A CRIMINAL OFFENSE.
Merrill Lynch,                 Inquiries should be directed to the Trustee at
   
Pierce, Fenner & Smith         1-800-221-7771.
Incorporated                   Prospectus dated February 5, 1998.
    
PaineWebber Incorporated       INVESTORS SHOULD READ THIS PROSPECTUS CAREFULLY
Dean Witter Reynolds Inc.      AND RETAIN IT FOR FUTURE REFERENCE.

 
<PAGE>
- --------------------------------------------------------------------------------
 
Defined Asset FundsSM
Defined Asset Funds is America's oldest and largest family of unit investment
trusts, with over $115 billion sponsored over the last 25 years. Each Defined
Asset Fund is a portfolio of preselected securities. The portfolio is divided
into 'units' representing equal shares of the underlying assets. Each unit
receives an equal share of income and principal distributions.
 
Defined Asset Funds offer several defined 'distinctives'. You know in advance
what you are investing in and that changes in the portfolio are limited - a
defined portfolio. Most defined bond funds pay interest monthly - defined
income. The portfolio offers a convenient and simple way to invest - simplicity
defined.
 
Your financial professional can help you select a Defined Asset Fund to meet
your personal investment objectives. Our size and market presence enable us to
offer a wide variety of investments. The Defined Asset Funds family offers:
 
 Municipal bond portfolios
 Corporate bond portfolios
 Government bond portfolios
 Equity portfolios
 International bond and equity portfolios
 
The terms of Defined Funds are as short as one year or as long as 30 years.
Special defined bond funds are available including: insured funds, double and
triple tax-free funds and funds with 'laddered maturities' to help protect
against changing interest rates. Defined Asset Funds are offered by prospectus
only.
- ----------------------------------------------------------------
Defined Western Portfolio
- ----------------------------------------------------------------
 
This Portfolio follows a straightforward strategy: buy the common stocks that
meet the criteria described below and hold the stocks for about two years. The
Portfolio contains 32 domestic common stocks selected by the Sponsor for capital
appreciation. At the end of approximately two years, the Portfolio will be
liquidated and a new Portfolio may be selected. The Sponsors reserve the right,
however, not to offer a new portfolio.
 
We selected the 32 common stocks in the Portfolio through the following
four-step process. First, we identified companies headquartered in one of the
states west of the Mississippi River. Second, in those states, we eliminated
those companies with a market capitalization of less than $1 billion. Third, of
the remaining issuers we screened for companies with positive growth in earnings
per share for each of the last three years and with an expected growth rate of
earnings per share of at least 10% over the next fiscal year. Finally, the Agent
for the Sponsors reviewed the identified stocks for credit quality, liquidity
and other factors and made a final selection of the Portfolio.
 
Because there is no active management of the Portfolio, the Sponsors anticipate
that the Portfolio will remain unchanged over its two-year life despite adverse
developments concerning an issuer, an industry or the economy or stock market
generally.
- ----------------------------------------------------------------
Defining Your Portfolio
- ----------------------------------------------------------------
 
   
Based upon the principal business of each issuer and current market values, the
following industries are represented in the Portfolio:
 
                                       APPROXIMATE PORTFOLIO
                                            PERCENTAGE
 
  o Computer & Technology                     40%
  o Oil & Gas Related                         19%
  o Apparel & Consumer Goods                   8%
  o Pharmaceuticals                            8%
  o Bank & Financial                           7%
  o Wholesale & Retail                         7%
  o Telecommunication                          6%
  o Services                                   5%
- ----------------------------------------------------------------
Defining Your Risks
- ----------------------------------------------------------------
 
The Portfolio is concentrated in computer and technology stocks. It is also
concentrated in stocks of companies headquartered in California (55%) and Texas
(32%). (See Risk Factors in Part B.)
 
The Portfolio is designed for investors who wish to invest in companies
headquartered in a geographic region that has been experiencing superior
economic growth. There can be no assurance, however, that a company
headquartered in a particular region derives a significant part of its business
from that region or that this Portfolio will appreciate more than or as much as
a Portfolio of stocks with greater geographic diversification.
 
    

The Portfolio is not an appropriate investment for those who are unable or
unwilling to assume the risk involved generally with an equity investment. It
may not be appropriate for investors seeking either preservation of capital or
current income.
 
Unit price fluctuates with the value of the Portfolio, and the value of the
Portfolio could be affected by changes in the financial condition of the
issuers, changes in the various industries represented in the Portfolio,
movements in stock prices generally, the impact of purchase and sale of
securities for the Portfolio (especially during the primary offering period of
units and during the rollover period, if any) and other factors. Additionally,
equity markets have been at historically high levels and no assurance can be
given that these levels will continue.
 
Unlike a mutual fund, the Portfolio is not actively managed and the Sponsors
receive no management fee. Therefore, any adverse financial condition of an
issuer or any market movement in the price of a security will not require the
sale of securities from the Portfolio and the Portfolio may continue to purchase
or hold securities originally selected even though the assessment of their
quality may have changed.
 
                                      A-2
<PAGE>
- ----------------------------------------------------------------
Defining Your Investment
- ----------------------------------------------------------------
 
PUBLIC OFFERING PRICE PER 1,000 UNITS                  $1,000.00
 
   
The Public Offering Price as of February 4, 1998, the business day prior to the
initial date of deposit is based on the aggregate value of the underlying
securities ($289,506.25) and any cash held to purchase securities, divided by
the number of units outstanding (292,430) times 1,000, plus the initial sales
charge. The Public Offering Price on any subsequent date will vary. The
underlying securities are valued by the Trustee on the basis of their closing
sale prices at 4:00 p.m. Eastern time on every business day.
 
    

SALES CHARGES
 
The total sales charge for this investment combines an initial up-front sales
charge and an annual deferred sales charge that will be deducted from the net
asset value of the Portfolio in seven monthly payments each year of the
Portfolio. If you redeem or exchange your units prior to March 1, 1999, you will
not pay the deferred sales charge for the second year.
 
EXCHANGE OPTION
 
You may exchange your units of this Portfolio for units of any Select or Focus
Series any time prior to termination of this Portfolio. If you continue to hold
your units, when this Portfolio is about to be liquidated you may have the
option to roll your proceeds into the next Series, if one is available. If you
notify your financial professional by February 4, 2000, your units will be
redeemed and your proceeds will be reinvested in units of the next Portfolio, if
available. If you decide not to roll over your proceeds, you will receive a cash
distribution after termination. Of course you can sell or redeem your Units at
any time prior to termination.
 
ANNUAL INCOME DISTRIBUTIONS
 
You will receive distributions of any dividend income, net of expenses, on the
25th day of December 1998 and December 1999, if you own Units on the 10th of
those months.
 
In order to meet certain tax requirements, a special distribution of income
including capital gains may be declared for investors of record as of a date in
December, which special distribution will generally be paid after the end of the
year.
 
REINVESTMENT OPTION
 
You can elect to automatically reinvest your distributions into additional units
of the Portfolio subject only to the deferred sales charge remaining at the time
of reinvestment. Reinvesting helps to compound your income for a greater total
return.
 
TAXES
 
   
Distributions that are taxable as ordinary income to investors will constitute
dividends for Federal income tax purposes and may, subject to certain
limitations, be eligible for the dividends-received deduction for certain
corporations.
 
Investors who are individuals and have held their units for more than 18 months
may be entitled to a 20% maximum federal tax rate for gains from the sale of
these units. Certain dividends from the Portfolio may be designated as either
20% or 28% distributions, which individual investors may be entitled to treat as
long-term gain in the 20% or 28% groups respectively.
 
Foreign investors should be aware that distributions will generally be subject
to information reporting and withholding taxes. (See Taxes in Part B.)
 
TERMINATION DATE
 
The Portfolio will terminate by March 3, 2000. The final distribution will be
made within a reasonable time afterward. The Portfolio may be terminated earlier
if its value is less than 40% of the value of the securities when deposited.
 
SPONSORS' PROFIT OR LOSS
 
The Sponsors' profit or loss from the Portfolio will include the receipt of
applicable sales charges, fluctuations in the Public Offering Price or secondary
market price of units, a loss of $206.25 on the initial deposit of the
securities and a gain or loss on subsequent deposits of securities (see
Sponsors' and Underwriters' Portfolio in Part B).
    
 
                                      A-3
<PAGE>
- ----------------------------------------------------------------
Defining Your Costs
- ----------------------------------------------------------------
 
SALES CHARGE
 
You will pay an initial sales charge of about 1.0%. In addition, seven monthly
deferred sales charges of $2.50 per 1,000 units ($17.50 annually) will be
deducted from the Portfolio's net asset value each year of the Portfolio's
two-year life (July 1, 1998 through January 1, 1999 and March, 1999 through
September 1, 1999). This deferred method of payment keeps more of your money
invested over a longer period of time. The sales charge is reduced on purchases
of $50,000 or more as shown in Part B. If you exchange units of this Portfolio
for units of a Select or Focus Series or roll the proceeds of your investment
into a new portfolio, you will not be subject to the 1.0% initial charge. (See
How To Buy Units--Public Offering Price.)
 
Although this is a unit investment trust rather than a mutual fund, the
following information is presented to permit a comparison of fees and an
understanding of the direct or indirect costs and expenses that you pay. On a
$1,000 investment for 1,000 Units, you will pay the following charges:
 

                                                         As a %
                                                  of Initial Public
                                                  Offering Price
                                                  -----------------
Initial Sales Charge                                       1.00%
Deferred Sales Charge per Year                             1.75%
Maximum Sales Charge                                       4.50%
Maximum Sales Charge Imposed on Reinvested
  Dividends                                                2.00%

 
ESTIMATED ANNUAL PORTFOLIO OPERATING EXPENSES
 
   

                                        As a %       Amount per
                                  of Net Assets     1,000 Units
                                  ---------------  --------------
Trustee's Fee                             .091%      $     0.90
Portfolio Supervision,
  Bookkeeping and Administrative
  Fees                                    .046%      $     0.45
Organizational Expenses                   .143%      $     1.42
Other Operating Expenses                  .042%      $     0.42
                                  ---------------  --------------
TOTAL                                     .322%      $     3.19

 
    

These estimates do not include the costs of purchasing and selling the
underlying Strategy Stocks.
 
Investors will bear all or a portion of the Portfolio's organizational
costs--including costs of preparing the registration statement, the trust
indenture and other closing documents, registering units with the SEC and the
states and the initial audit of the Portfolio--as is common for mutual funds.
 
COSTS OVER TIME
 
You would pay the following cumulative expenses on a $1,000 investment, assuming
a 5% annual return on the investment throughout the indicated periods and
redemption at the end of the period:
 

   
 1 Year     3 Years    5 Years    10 Years
   $31        $75       $121        $250
    

 
Although the Portfolio has a term of only two years and is a unit investment
trust rather than a mutual fund, this information is presented to permit a
comparison of fees, assuming the investment is rolled over into a new Portfolio
subject only to the deferred sales charge and Portfolio expenses.
 
The example assumes reinvestment of all dividends and distributions and uses a
5% annual rate of return as mandated by SEC regulations applicable to mutual
funds. For purposes of the example, the deferred sales charge imposed on
reinvestment of dividends is not reflected until the year following payment of
the dividend; the cumulative expenses would be higher if sales charges on
reinvested dividends were reflected in the year of reinvestment.
 
Reductions to the repurchase and cash redemption prices in the secondary market
to recoup the costs of liquidating securities to meet redemption (described
below) have not been reflected. The example should not be considered a
representation of past or future expenses or annual rates of return; the actual
expenses and annual rates of return may be more or less than the example.
 
REDEEMING OR SELLING YOUR INVESTMENT
 
   
You may redeem or sell your units at any time prior to the termination of the
Portfolio. Your price will be based on the then current net asset value. The
redemption and secondary market repurchase price as of February 4, 1998 was
$972.50 per 1,000 units ($27.50 per 1,000 units less than the Public Offering
Price). This price reflects deductions of the annual deferred sales charge which
declines over each year of the Portfolio ($17.50 initially). If you sell your
units before January 1, 1999, you will pay only the balance of any deferred
sales charge remaining for the first year. If you redeem or sell your units on
or after March 1, 1999, you will pay the remaining balance of the deferred sales
charge for the second year. After the initial offering period, the repurchase
and cash redemption prices for units may be reduced to reflect the estimated
costs of liquidating securities to meet the redemption, currently estimated at
$0.80 per 1,000 units. If you reinvest in a new Portfolio, you will pay your
share of any brokerage commissions on the sale of underlying securities when
your units are liquidated during the rollover.
    
 
                                      A-4
<PAGE>
- --------------------------------------------------------------------------------
                               Defined Portfolio
- --------------------------------------------------------------------------------
 
Equity Investor Fund
 
   
Western Premier Portfolio                                       February 5, 1998
 
Defined Asset Funds
 

<TABLE><CAPTION>

                                                                                                      PRICE
                                                                                                    PER SHARE
                                        TICKER         NUMBER OF SHARES           PERCENTAGE       TO PORTFO-         COST
NAME OF ISSUER                          SYMBOL          OF COMMON STOCK        OF PORTFOLIO (1)        LIO      TO PORTFOLIO (2)
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                    <C>             <C>                     <C>                 <C>         <C>
1. AirTouch Communications, Inc.          ATI                    400                    6.05%          43.7500   $     17,500.00
2. ALZA Corporation                       AZA                    300                    3.81           36.7500         11,025.00
3. American General Corporation           AGC                    100                    1.97           57.0625          5,706.25
4. Avery Dennison Corporation             AVY                    100                    1.63           47.1875          4,718.75
5. BankAmerica Corporation                BAC                    100                    2.47           71.5625          7,156.25
6. BMC Software, Inc.                    BMCS                    200                    4.84           70.1250         14,025.00
7. Callaway Golf Company                  ELY                    100                    0.96           27.8125          2,781.25
8. Camco International, Inc.              CAM                    200                    4.11           59.5000         11,900.00
9. Cisco Systems Inc.                    CSCO                    300                    6.69           64.5625         19,368.75
10. The Clorox Company                    CLX                    100                    2.71           78.5000          7,850.00
11. The Coastal Corporation               CGP                    100                    2.05           59.2500          5,925.00
12. Dell Computer Corporation            DELL                    200                    7.44          107.6250         21,525.00
13. ENSCO International
    Incorporated                          ESV                    200                    2.10           30.4375          6,087.50
14. Franklin Resources, Inc.              BEN                    100                    1.66           48.0000          4,800.00
15. Gap, Inc.                             GPS                    100                    1.41           40.9375          4,093.75
16. Halliburton Company                   HAL                    200                    3.30           47.7500          9,550.00
17. Intel Corporation                    INTC                    100                    3.02           87.5625          8,756.25
18. Mattel, Inc.                          MAT                    100                    1.45           42.0625          4,206.25
19. Microchip Technology, Inc.           MCHP                    300                    2.81           27.1250          8,137.50
20. Microsoft Corporation                MSFT                    100                    5.42          156.8125         15,681.25
21. Nike, Inc.                            NKE                    100                    1.46           42.1875          4,218.75
22. Oracle Corporation                   ORCL                    600                    5.06           24.4375         14,662.50
23. Safeway Inc.                          SWY                    100                    2.35           68.0625          6,806.25
24. Service Corporation
    International                         SRV                    300                    3.81           36.8125         11,043.75
25. Solectron Corporation                 SLR                    300                    4.66           44.9375         13,481.25
26. Southwest Airlines Company            LUV                    100                    0.96           27.7500          2,775.00
27. SunAmerica Inc.                       SAI                    100                    1.39           40.1875          4,018.75
28. Sysco Corporation                     SYY                    100                    1.62           47.0000          4,700.00
29. Tidewater, Inc.                       TDW                    100                    1.50           43.3750          4,337.50
30. Varco International, Inc.             VRC                    700                    5.76           23.8125         16,668.75
31. Wal-Mart Stores, Inc.                 WMT                    100                    1.49           43.1875          4,318.75
32. Watson Pharmaceuticals, Inc.          WPI                    300                    4.04           38.9375         11,681.25
                                                                             --------------------               -----------------
                                                                                      100.00%                    $    289,506.25
                                                                             --------------------               -----------------
                                                                             --------------------               -----------------

</TABLE>
 
- ------------------------------------
 
(1) Based on Cost to Portfolio.
 
(2) Valuation by the Trustee made on the basis of closing sale prices at the
    evaluation time on February 4, 1998, the business day prior to the initial
    date of deposit. The value of the Securities on any subsequent business day
    will vary.
 
                      ------------------------------------
 
The securities were acquired on February 4, 1998 and are represented entirely by
contracts to purchase the securities. Any of the Sponsors may have acted as
underwriters, managers or co-managers of a public offering of the securities in
this Portfolio during the last three years. Affiliates of the Sponsors may serve
as specialists in the securities in this Portfolio on one or more stock
exchanges and may have a long or short position in any of these securities or in
options on any of them, and may be on the opposite side of public orders
executed on the floor of an exchange where the securities are listed. An
officer, director or employee of any of the Sponsors may be an officer or
director of one or more of the issuers of the securities in the Portfolio. A
Sponsor may trade for its own account as an odd-lot dealer, market maker, block
positioner and/or arbitrageur in any of the securities or in options on them.
Any Sponsor, its affiliates, directors, elected officers and employee benefits
programs may have either a long or short position in any securities or in
options on them.
    
 
                                      A-5
<PAGE>
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
The Sponsors, Trustee and Holders of Equity Investor Fund, Western Premier
Portfolio, Defined Asset Funds (the 'Portfolio'):
 
   
We have audited the accompanying statement of condition and the related defined
portfolio included in the prospectus of the Portfolio as of February 5, 1998.
This financial statement is the responsibility of the Trustee. Our
responsibility is to express an opinion on this financial statement based on our
audit.
    
 
We conducted our audit in accordance with generally accepted auditing standards.
Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statement is free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statement. Our procedures included
confirmation of an irrevocable letter of credit deposited for the purchase of
securities, as described in the statement of condition, with the Trustee. An
audit also includes assessing the accounting principles used and significant
estimates made by the Trustee, as well as evaluating the overall financial
statement presentation. We believe that our audit provides a reasonable basis
for our opinion.
 
   
In our opinion, the financial statement referred to above presents fairly, in
all material respects, the financial position of the Portfolio as of February 5,
1998 in conformity with generally accepted accounting principles.
 
DELOITTE & TOUCHE LLP
New York, N.Y.
February 5, 1998
 
                 STATEMENT OF CONDITION AS OF FEBRUARY 5, 1998
 
TRUST PROPERTY
 

Investments--Contracts to purchase Securities(1).........$         289,506.25
Organizational Costs(2)..................................           71,000.00
                                                         --------------------
           Total.........................................$         360,506.25
                                                         --------------------
                                                         --------------------
LIABILITY AND INTEREST OF HOLDERS
     Accrued Liability(2)................................$          71,000.00
                                                         --------------------
     Subtotal                                                       71,000.00
                                                         --------------------
Interest of Holders of 292,430 Units of fractional
  undivided interest outstanding:(3)
  Cost to investors(4)...................................$         292,430.00
  Gross underwriting commissions(5)......................           (2,923.75)
                                                         --------------------
     Subtotal                                                      289,506.25
                                                         --------------------
           Total.........................................$         360,506.25
                                                         --------------------
                                                         --------------------

 
- ---------------
 
          (1) Aggregate cost to the Portfolio of the securities listed under
Defined Portfolio determined by the Trustee at 4:00 p.m., Eastern time on
February 4, 1998. The contracts to purchase securities are collateralized by an
irrevocable letter of credit which has been issued by DBS Bank, New York Branch,
in the amount of $289,731.25 and deposited with the Trustee. The amount of the
letter of credit includes $289,506.25 for the purchase of securities.
 
          (2) This represents a portion of the Portfolio's organizational costs
which will be deferred and amortized over the life of the Portfolio.
Organizational costs have been estimated based on projected total assets of $50
million. To the extent the Portfolio is larger or smaller, amounts may vary.
    
 
          (3) Because the value of securities at the evaluation time on the
Initial Date of Deposit may differ from the amounts shown in this statement of
condition, the number of Units offered on the Initial Date of Deposit will be
adjusted from the initial number of Units to maintain the $1,000 per 1,000 Units
offering price only for that day. The Public Offering Price on any subsequent
business day will vary.
 
   
          (4) Aggregate public offering price computed on the basis of the value
of the underlying securities at 4:00 p.m., Eastern time on February 4, 1998.
 
          (5) Assumes the maximum initial sales charge per 1,000 units of 1.00%
of the Public Offering Price. A deferred sales charge of $17.50 per 1,000 Units
is payable each year ($2.50 per 1,000 Units monthly July 1, 1998-January 1, 1999
and March 1, 1999-September 1, 1999). Distributions will be made to an account
maintained by the Trustee from which the deferred sales charge obligation of the
investors to the Sponsors will be satisfied. If units are redeemed prior to
March 1, 1999, or between March 1, 1999 and September 1, 1999, the remaining
portion of the distribution applicable to such units will be transferred to such
account on the redemption date.
    
 
                                      A-6
<PAGE>
                             DEFINED ASSET FUNDSSM
                               PROSPECTUS--PART B
                              EQUITY INVESTOR FUND
                           WESTERN PREMIER PORTFOLIO
             FURTHER INFORMATION REGARDING THE FUND MAY BE OBTAINED
     WITHIN FIVE DAYS OF WRITING OR CALLING THE TRUSTEE AT THE ADDRESS AND
        TELEPHONE NUMBER SET FORTH ON THE BACK COVER OF THIS PROSPECTUS.
 
                                     Index
 

                                                          PAGE
                                                        ---------
Portfolio Description.................................          1
Risk Factors..........................................          2
How to Buy Units......................................          3
How to Redeem or Sell Units...........................          5
Exchange Option.......................................          6
Income, Distributions and Reinvestment................          7
                                                          PAGE
                                                        ---------
Portfolio Expenses....................................          7
Taxes.................................................          8
Records and Reports...................................         10
Trust Indenture.......................................         10
Miscellaneous.........................................         11
Supplemental Information..............................         13

 
PORTFOLIO DESCRIPTION
 
THE STRATEGY
 
   
     The Portfolio seeks capital appreciation by acquiring and holding for about
two years certain common stocks of companies headquartered in one of the states
west of the Mississippi River and chosen through the selection criteria
described in Part A. The Portfolio will terminate in about two years, when
investors may choose to either receive the distribution in cash or reinvest in
the next Series (if available) at a reduced sales charge. There can be no
assurance that current dividend rates on the Stocks will be maintained or that
any dividends will be declared or paid in the future on the Securities. Current
income is not an objective of the Portfolio.
    
 
     The Portfolio contains the common stocks selected through the process
described in Part A. No leverage or borrowing is used nor does the Portfolio
contain other kinds of securities to enhance yield.
 
     Investors should be aware that the Portfolio may not be able to buy each
Security at the same time because of availability of the Security, any
restrictions applicable to the Portfolio relating to the purchase of the
Security by reason of the federal securities laws or otherwise. Any monies
allocated to the purchase of a Security will generally be held for the purchase
of the Security.
 
     The deposit of the Securities in the Portfolio on the initial date of
deposit established a proportionate relationship among the number of shares of
each Security. During the 90-day period following the initial date of deposit
the Sponsors may deposit additional Securities in order to create new Units,
maintaining to the extent practicable that original proportionate relationship.
Deposits of additional Securities subsequent to the 90-day period must generally
replicate exactly the proportionate relationship among the number of shares of
each Security at the end of the initial 90-day period. The ability to acquire
each Security at the same time will generally depend upon the Security's
availability and any restrictions on the purchase of that Security under the
federal securities laws or otherwise.
 
     Additional Units may also be created by the deposit of cash (including a
letter of credit) with instructions to purchase additional Securities. This
practice could cause both existing and new investors to experience a dilution of
their investments and a reduction in their anticipated income because of price
fluctuations in the Securities between the time of the cash deposit and the
actual purchase of the additional Securities and because the associated
brokerage fees will be an expense of the Portfolio. To minimize the risk of
price fluctuations when purchasing Securities, the
 
                                       1
<PAGE>
Portfolio will try to purchase Securities as close to the Evaluation Time or at
prices as close to the evaluated prices as possible. The Portfolio may also
enter into program trades with unaffiliated broker/dealers, which may have the
effect of increasing brokerage commissions while reducing market risk. Portfolio
investors may benefit from reduced commissions and institutional prices
available to the Portfolio.
 
     Because each Defined Asset Fund is a preselected portfolio, you know the
securities before you invest. Of course, the Portfolio will change somewhat over
time, as Securities are purchased upon creation of additional Units, as
securities are sold to meet Unit redemptions or in other limited circumstances.
 
PORTFOLIO SUPERVISION
 
     The Portfolio follows a buy and hold investment strategy that buys stocks
and generally holds them for two years, in contrast to the frequent portfolio
changes of a managed fund based on economic, financial and market analyses. In
the event a public tender offer is made for a Security or a merger or
acquisition is announced affecting a Security, the Sponsor may instruct the
Trustee to tender or sell the Security in the open market when in its opinion it
is in the best interests of investors to do so. While the Portfolio is not
actively managed, the Portfolio is regularly reviewed and evaluated and
Securities may be sold in the case of adverse developments concerning a
Security, including the adverse financial condition of the issuer, the
institution of legal proceedings against the issuer, or a decline in the price
or the occurrence of other market or credit factors that might make retention of
the Security detrimental to the interest of investors or if the disposition of
these Securities is necessary in order to enable the Portfolio to make
distributions of the Portfolio's capital gain net income or desirable in order
to maintain the qualification of the Portfolio as a regulated investment company
under the Internal Revenue Code. Securities can also be sold to meet redemption
of Units. In selling Securities the Portfolio will attempt to minimize any
current tax liability for current investors. The Sponsor is also authorized to
direct the reinvestment of the proceeds of the sale of Securities, as well as
moneys held to cover the purchase of Securities pursuant to contracts which have
failed, in additional Securities, including U.S. Treasury Securities. The
Portfolio may continue to hold a Security and purchase additional shares even
though the research analyst's opinion or the assessment of a Security or sector
may have changed or subsequent to the initial date of deposit a Security may no
longer satisfy the Portfolio's selection criteria.
 
RISK FACTORS
 
     An investment in the Portfolio entails certain risks, including the risk
that the value of your investment will decline if the financial condition of the
issuers of the Securities becomes impaired or if the general condition of the
stock market worsens. The rights of holders of common stocks to receive payments
from the issuer are generally inferior to the rights of creditors of, or holders
of debt obligations or preferred stocks issued by, the issuer. Moreover, because
common stocks do not represent an obligation of the issuer they do not offer any
assurance of income or provide the degree of protection of capital provided by
debt securities. Common stocks in general are susceptible to general stock
market movements and to volatile increases and decreases in value as market
confidence in and perceptions of the issuers change. Equity markets can be
affected by unpredictable factors including expectations regarding government,
economic, monetary and fiscal policies, inflation and interest rates, economic
expansion or contraction, and global or regional political, economic or banking
crises. The Sponsors cannot predict the direction or scope of any of these
factors. Additionally, equity markets have been at historically high levels and
no assurance can be given that these levels will continue. There can be no
assurance that the Portfolio will be effective in achieving its objective over
the life of the Portfolio or that any future portfolios selected through this
process during consecutive two-year periods will meet their objectives. The
Portfolio is not designed to be a complete investment program.
 
   
COMPUTER AND TECHNOLOGY STOCKS
 
     The Fund is concentrated in stocks of issuers that manufacture
semiconductors, electronic components, software, integrated systems and other
related products. These kinds of companies are rapidly developing and highly
competitive, both domestically and internationally, and tend to be relatively
volatile as compared to other types of investments. Certain of these companies
may be smaller and less seasoned companies with limited product lines, markets
or financial resources and limited management or marketing personnel. These
companies are characterized by a high degree of investment to maintain
competitiveness and are affected by worldwide scientific and technological
developments (and resulting product obsolescence) as well as government
regulation, increase in material or labor costs, changes in distribution
channels and the need to manage inventory levels in line with product demand.
Other
 
                                       2
<PAGE>
risk factors include short product life cycles, aggressive pricing and reduced
profit margins, dramatic and often unpredictable changes in growth rates,
frequent new product introduction, the need to enhance existing products,
intense competition from large established companies and potential competition
from small start up companies. These companies are also dependent to a
substantial degree upon skilled professional and technical personnel and there
is considerable competition for the services of qualified personnel in the
industry.
    
 
LITIGATION AND LEGISLATION
 
     The Sponsors do not know of any pending litigation as of the initial date
of deposit that might reasonably be expected to have a material adverse effect
on the Portfolio, although pending litigation may have a material adverse effect
on the value of Securities in the Portfolio. In addition, at any time after the
initial date of deposit, litigation may be initiated on a variety of grounds, or
legislation may be enacted, affecting the Securities in the Portfolio or the
issuers of the Securities. Changing approaches to regulation may have a negative
impact on certain companies represented in the Portfolio. There can be no
assurance that future litigation, legislation, regulation or deregulation will
not have a material adverse effect on the Portfolio or will not impair the
ability of the issuers of the Securities to achieve their business goals. From
time to time Congress considers proposals to reduce the rate of the
dividends-received deduction. This type of legislation, if enacted into law,
would adversely affect the after-tax return to investors who can take advantage
of the deduction. See Taxes.
 
LIFE OF THE PORTFOLIO; TERMINATION
 
     The size and composition of the Portfolio will be affected by the level of
redemptions of Units that may occur from time to time. Principally, this will
depend upon the number of investors seeking to sell or redeem their Units or
participating in a rollover. The Portfolio will be terminated no later than the
mandatory termination date specified in Part A of the Prospectus. It will
terminate earlier upon the disposition of the last Security or upon the consent
of investors holding 51% of the Units. The Portfolio may also be terminated
earlier by the Sponsors once its total assets have fallen below the minimum
value specified in Part A of the Prospectus. A decision by the Sponsors to
terminate the Portfolio early, which will likely be made following the rollover,
will be based on factors such as the size of the Portfolio relative to its
original size, the ratio of Portfolio expenses to income, and the cost of
maintaining a current prospectus.
 
     Notice of impending termination will be provided to investors and
thereafter units will no longer be redeemable. On or shortly before termination,
the Trustee will seek to dispose of any Securities remaining in the Portfolio
although any Security unable to be sold at a reasonable price may continue to be
held by the Trustee in a liquidating trust pending its final disposition. A
proportional share of the expenses associated with termination, including
brokerage costs in disposing of Securities, will be borne by investors remaining
at that time. This may have the effect of reducing the amount of proceeds those
investors are to receive in any final distribution.
 
HOW TO BUY UNITS
 
     Units are available from any of the Sponsors at the Public Offering Price.
The Public Offering Price varies each Business Day with changes in the value of
the Portfolio and other assets and liabilities of the Portfolio.
 
PUBLIC OFFERING PRICE
 
     Units are charged a combination of Initial and Deferred Sales Charges which
will aggregate 2.75% of the public offering price for the first year ($17.50
Deferred Sales Charge plus an Initial Sales Charge of about 1.0%, totaling 2.75%
of the public offering price) and approximately 1.75% for the second year.
Because the annual Deferred Sales Charge is $17.50 per 1,000 Units in the second
year regardless of the price you pay, the maximum sales charges expressed as a
percentage of the public offering price will vary with the price you pay. For
example, if you buy 1,000 Units for $1,050 (including an initial sales charge of
$11.38) and hold the Units until termination, you will pay a total sales charge
of $46.38 or 4.42% of the acquisition price on those Units. At an acquisition
price of $950 (including an initial sales charge of $8.63), you would pay a
total sales charge of $43.63 or 4.59% of the acquisition price.
 
     For quantity purchases of units by an investor and the investor's spouse
and minor children, or by a single trust estate or fiduciary account, made on a
single day, the following percentages will apply (assuming a $1,000 public
offering price for 1,000 Units):
 
                                       3
<PAGE>
 
<TABLE><CAPTION>

                                                             SALES CHARGES IN FIRST YEAR         CUMULATIVE SALES
                                                                           DEALER CONCESSION            CHARGES
                            -------------------------------------------------------------------
                                                                                 AS % OF
                                                                         PUBLIC OFFERING
                                                                                   PRICE         -------------------
                              AS % OF PUBLIC           AS % OF NET      -----------------------  AS % OF PUBLIC
AMOUNT PURCHASED              OFFERING PRICE         AMOUNT INVESTED                             OFFERING PRICE
- --------------------------  -----------------------  -----------------                           -------------------
<S>                         <C>                      <C>                <C>                      <C>
Less than $50,000                       2.75%                2.778%                 2.00%                  4.50%
$50,000 to $99,999                      2.50                 2.519                  1.80                   4.25
$100,000 to $249,999                    2.00                 2.005                  1.45                   3.75
$250,000 to $999,999                    1.75                 1.750                  1.25                   3.50
$1,000,000 or more                      1.00                 1.000                   .50                   2.75


</TABLE>
                             AS % OF PUBLIC
AMOUNT PURCHASED             OFFERING PRICE
- --------------------------  ---------------------
Less than $50,000                     4.712%
$50,000 to $99,999                    4.439
$100,000 to $249,999                  3.896
$250,000 to $999,999                  3.627
$1,000,000 or more                    2.828

 
     The annual Deferred Sales Charge is a charge of $17.50 per 1,000 units and
is accrued in seven monthly installments each year of the Portfolio, in the
months indicated in part A of this Prospectus. Units redeemed or repurchased
prior to the accrual of the final Deferred Sales Charge installment in the first
or second year will have the amount of any remaining installments deducted from
the redemption or repurchase proceeds or deducted in calculating an in-kind
redemption, although this deduction will be waived in the event of the death or
disability (as defined in the Internal Revenue Code) of an investor.
 
     It is anticipated that Securities will not be sold to pay the Deferred
Sales Charge until after the date of the last installment in each year of the
Portfolio. Investors will be at risk for market price fluctuations in the
Securities from the several installment accrual dates to the dates of actual
sale of Securities to satisfy this liability. In selling Securities the
Portfolio will attempt to minimize any current tax liability for current
investors.
 
     Selling dealers will be entitled to the concession stated in the table
above on Units sold or redeemed during the first year. On Units held in the
second year of the Portfolio, the selling dealer will be entitled to an
additional concession of $11 per 1,000 Units ($5 per 1,000 Units for purchases
of $1 million or more). Employees of certain Sponsors and Sponsor affiliates and
non-employee directors of certain of the Sponsors may purchase Units at a
reduced sales charge.
 
     Commercial banks and their securities broker subsidiaries that have
agreements with the Sponsors may make Units available to their customers as
their agents. A portion of the sales charge (equal to the dealer commission
referred to above) will be retained or remitted to the banks. Under the
Glass-Steagall Act, banks are prohibited from underwriting Units; however, the
Glass-Steagall Act permits banks to act as agents of their customers on a
disclosed basis and federal banking regulations have approved similar
arrangements. In addition, state securities laws on this issue may differ from
the interpretation of federal law expressed above and banks and financial
institutions may be required to register as dealers pursuant to state law.
 
EVALUATIONS
 
     Evaluations are determined by the Trustee on each Business Day. This
excludes Saturdays, Sundays and the following holidays as observed by the New
York Stock Exchange: New Year's Day, Martin Luther King, Jr. Day, Presidents'
Day, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving and
Christmas. If the Securities are listed on a national securities exchange or the
Nasdaq National Market, evaluations are generally based on closing sales prices
on that exchange or that system (unless the Trustee deems these prices
inappropriate) or, if closing sales prices are not available, at the mean
between the closing bid and offer prices. If the Securities are not listed or if
listed but the principal market is elsewhere, the evaluation is generally
determined based on sales prices of the Securities on the over-the-counter
market or, if sales prices in that market are not available, on the basis of the
mean between current bid and offer prices for the Securities or for comparable
securities or by appraisal or by any combination of these methods. Neither the
Sponsors nor the Trustee guarantee the enforceability, marketability or price of
any Securities.
 
NO CERTIFICATES
 
     All investors are required to hold their Units in uncertifcated form and in
'street name' by their broker, dealer or financial institution at the Depository
Trust Company ('DTC').
 
                                       4
<PAGE>
HOW TO REDEEM OR SELL UNITS
 
     You can redeem your Units at any time for net asset value. In addition, the
Sponsors have maintained an uninterrupted secondary market for Units for over 20
years and will ordinarily buy back Units at net asset value. The following
describes these two methods to redeem or sell Units in greater detail.
 
REDEEMING UNITS
 
     You can always redeem your Units for net asset value. This can be done by
contacting your broker, dealer or financial institution that holds your Units in
street name. In certain instances, additional documents may be required such as
a trust instrument, certificate of corporate authority, certificate of death or
appointment as executor, administrator or guardian.
 
     Within seven days after the receipt of your request (and any necessary
documents), a check will be mailed to you in an amount equal to the net asset
value of your Units. Because of the sales charge, market movements or changes in
the Portfolio, net asset value at the time you redeem your Units may be greater
or less than the original cost of your Units. Net asset value is calculated each
Business Day by adding the value of the Securities, declared but unpaid
dividends on the Securities, cash and the value of any other Portfolio assets;
deducting unpaid taxes or other governmental charges, accrued but unpaid
Portfolio expenses and any remaining Deferred Sales Charges, unreimbursed
Trustee advances, cash held to redeem Units or for distribution to investors and
the value of any other Portfolio liabilities; and dividing the result by the
number of outstanding Units. After the initial offering period, net asset value
will be reduced to reflect the cost to the Portfolio of liquidating Securities
to pay the redemption price.
 
     As long as the Sponsors are maintaining a secondary market for Units (as
described below), the Trustee will not actually redeem your Units but will sell
them to the Sponsors for net asset value. If the Sponsors are not maintaining a
secondary market, the Trustee will redeem your Units for net asset value or will
sell your Units in the over-the-counter market if the Trustee believes it will
obtain a higher net price for your Units. If the Trustee is able to sell the
Units for a net price higher than net asset value, you will receive the net
proceeds of the sale.
 
     If cash is not available in the Portfolio's Income and Capital Accounts to
pay redemptions, the Trustee may sell Securities selected by the Agent for the
Sponsors based on market and credit factors determined to be in the best
interest of the Portfolio. These sales are often made at times when the
Securities would not otherwise be sold and may result in lower prices than might
be realized otherwise and may also reduce the size and diversity of the
Portfolio. If Securities are being sold during a time when additional Units are
being created by the purchase of additional Securities (as described under
Portfolio Description--The Strategy), Securities will be sold in a manner
designed to maintain, to the extent practicable, the proportionate relationship
among the number of shares of each Security in the Portfolio.
 
     Any investor owning Units representing Securities with a value of at least
$250,000 who redeems those Units prior to the rollover notification date
indicated in Part A of the Prospectus may, in lieu of cash redemption, request
distribution in kind of an amount and value of Securities per Unit equal to the
otherwise applicable Redemption Price per Unit. Generally, whole shares of each
Security together with cash from the Capital Account equal to any fractional
shares to which the investor would be entitled (less any Deferred Sales Charge
payable) will be paid over to a distribution agent and either held for the
account of the investor or disposed of in accordance with instructions of the
investor. Any brokerage commissions on sales of Securities in connection with
in-kind redemptions will be borne by the redeeming investors. The in-kind
redemption option is subject to all applicable legal restrictions and may be
terminated by the Sponsors at any time upon prior notice to investors.
 
     Redemptions may be suspended or payment postponed (i) if the New York Stock
Exchange is closed (other than customary weekend and holiday closings), (ii) if
the SEC determines that trading on the New York Stock Exchange is restricted or
that an emergency exists making disposal or evaluation of the Securities not
reasonably practicable or (iii) for any other period permitted by SEC order.
 
SPONSORS' SECONDARY MARKET FOR UNITS
 
     The Sponsors, while not obligated to do so, will buy back Units at net
asset value without any other fee or charge as long as they are maintaining a
secondary market for Units. Because of the sales charge, market movements or
changes in the portfolio, net asset value at the time you sell your Units may be
greater or less than the original cost of
 
                                       5
<PAGE>
your Units. The Sponsors may resell the Units to other buyers or redeem the
Units by tendering them 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 for Units.
 
     The Sponsors may discontinue the secondary market for Units without prior
notice if the supply of Units exceeds demand or for other business reasons.
Regardless of whether the Sponsors maintain a secondary market, you have the
right to redeem your Units for net asset value with the Trustee at any time, as
described above.
 
EXCHANGE OPTION
 
     You may exchange Units for units of Select or Focus Portfolios, subject
only to the Deferred Sales Charge on the units received. Holders of units of any
Select or Focus Portfolio, of any other Defined Asset Fund with a regular
maximum sales charge of at least 3.50%, or of any unaffiliated unit trust with a
regular maximum sales charge of at least 3.0%, may exchange those units for
Units of this Portfolio at their relative net asset values, subject only to the
Deferred Sales Charge on the Units.
 
     To make an exchange, you should contact your financial professional to find
out what exchange funds are available and to obtain a prospectus. You may
acquire units of only those exchange funds in which the Sponsors are maintaining
a secondary market and which are lawfully for sale in the state where you
reside. An exchange is a taxable event normally requiring recognition of any
gain or loss on the units exchanged. However, the Internal Revenue Service may
seek to disallow a loss if the portfolio of the units acquired is not materially
different from the portfolio of the units exchanged; you should consult your own
tax adviser. If the proceeds of units exchanged are insufficient to acquire a
whole number of exchange fund units, you may pay the difference in cash (not
exceeding the price of a single unit acquired).
 
     As the Sponsors are not obligated to maintain a secondary market in any
series or to offer successor portfolios, there can be no assurance that units of
a desired series will be available for exchange. The Exchange Option may be
amended or terminated at any time without notice.
 
ROLLOVER
 
   
     In lieu of redeeming Units or receiving liquidation proceeds upon the
termination of the Portfolio, investors who hold their units with one of the
Sponsors may elect, by contacting their financial adviser prior to the rollover
notification date indicated in Part A, to apply their proportional interest in
the Securities and other assets of the Portfolio toward the purchase of units of
a new Portfolio (if available). It is expected that the terms of any new
Portfolio, including the exchange and rollover features, will be substantially
the same as those of this Portfolio.
    
 
     A rollover of your units is accomplished by the in-kind redemption of Units
followed by the sale of the underlying Securities by a distribution agent on
behalf of participating investors and the reinvestment of the sale proceeds (net
of brokerage fees, governmental charges and other sale expenses) in units of the
new portfolio at their net asset value.
 
     The Sponsors intend to sell the distributed Securities, on behalf of the
distribution agent, as quickly as practicable and then to create units of the
new portfolio as quickly as possible, subject in both cases to the Sponsors'
sensitivity that the concentrated sale and purchase of large volumes of
securities may affect market prices in a manner adverse to the interest of
investors. Accordingly, the Sponsors may, in their sole discretion, undertake a
more gradual sale of the distributed Securities and a more gradual creation of
units of the new portfolio to help mitigate any negative market price
consequences caused by this large volume of securities trades. In order to
minimize potential losses caused by market movement during the rollover period,
the Sponsors may enter into program trades, which might increase brokerage
commissions payable by investors. There can be no assurance, however, that any
trading procedures will be successful or might not result in less advantageous
prices. Pending the investment of rollover proceeds in the securities to
comprise the new portfolio, those moneys may be uninvested for up to several
days. For any Securities in the Portfolio that will also be in the new
Portfolio, a direct sale of those securities between the two funds is now
permitted pursuant to an SEC exemptive order. These sales will be effected at
the securities' closing sales prices on the exchanges where they are principally
traded, free of any brokerage costs.
 
                                       6
<PAGE>
   
     By participating in the rollover you may realize taxable capital gain on
the rollover but may not be entitled to a deduction for capital loss recognized
on the rollover. Because of the rollover procedures, you will not receive a cash
distribution with which to pay the taxes on any such capital gain. You should
consult your own tax advisers in this regard. Investors who do not participate
will continue to hold their Units until the termination of the Portfolio;
however, depending upon the extent of participation in the rollover, the
aggregate size of the Portfolio may be sharply reduced resulting in a
significant increase in per Unit expenses.
    
 
     The Sponsors may, in their sole discretion and without penalty or liability
to investors, decide not to sponsor a new Series or to modify the terms of the
rollover. Prior notice of any decision would be provided to investors.
 
     The Division of Investment Management of the SEC is of the view that the
rollover option constitutes an 'exchange offer', for the purposes of Section
11(c) of the Investment Company Act of 1940, and would therefore be prohibited
absent an exemptive order. The Sponsors have received exemptive orders under
Section 11(c) which they believe permit them to offer the rollover, but no
assurance can be given that the SEC will concur with the Sponsors' position and
additional regulatory approvals may be required.
 
INCOME, DISTRIBUTIONS AND REINVESTMENT
 
INCOME AND DISTRIBUTIONS
 
     The annual income per Unit, after deducting estimated annual Portfolio
expenses per Unit, will depend primarily upon the amount of dividends declared
and paid by the issuers of the Securities and changes in the expenses of the
Portfolio and, to a lesser degree, upon the level of purchases of additional
Securities and sales of Securities. There is no assurance that dividends on the
Securities will continue at their current levels or be declared at all.
 
     Each Unit receives an equal share of distributions of dividend income net
of estimated expenses. Because dividends on the Securities are not received at a
constant rate throughout the year, any distribution may be more or less than the
amount then credited to the Income Account. Dividends received are credited to
an Income Account and other receipts to a Capital Account. A Reserve Account may
be created by withdrawing from the Income and Capital Accounts amounts
considered appropriate by the Trustee to reserve for any material amount that
may be payable out of the Portfolio. Funds held by the Trustee in the various
accounts do not bear interest. In addition, distributions of amounts necessary
to pay the Deferred Sales Charge will be made from the Capital Account to an
account maintained by the Trustee for purposes of satisfying investors' sales
charge obligations. Although the Sponsors may collect the Deferred Sales Charge
monthly, to keep Units more fully invested the Sponsors currently do not
anticipate sales of Securities to pay the deferred sales charge until after the
rollover notification date. Proceeds of the disposition of any Securities not
used to pay Deferred Sales Charge or to redeem Units will be held in the Capital
Account and distributed on the final Distribution Day or following liquidation
of the Portfolio.
 
REINVESTMENT
 
     Income and principal distributions on Units may be reinvested by
participating in the reinvestment plan. Under the plan, the Units acquired for
investors will be either Units already held in inventory by the Sponsors or new
Units created by the Sponsors' deposit of additional Securities, contracts to
purchase additional Securities or cash (or a bank letter of credit in lieu of
cash) with instructions to purchase additional Securities. Deposits or purchases
of additional Securities will generally be made so as to maintain the then
existing proportionate relationship among the number of shares of each Security
in the Portfolio. Units acquired by reinvestment will not be subject to the
initial sales charge but will be subject to any remaining installments of
Deferred Sales Charge. The Sponsors reserve the right to amend, modify or
terminate the reinvestment plan at any time without prior notice. Investors
holding Units in 'street name' should contact their broker, dealer or financial
institution if they wish to participate in the reinvestment plan.
 
PORTFOLIO EXPENSES
 
     Estimated annual Portfolio expenses are listed in Part A of the Prospectus;
if actual expenses exceed the estimate, the excess will be borne by the
Portfolio. The estimated expenses do not include the brokerage commissions
payable by the Portfolio in purchasing and selling Securities. The Trustee's Fee
shown in Part A of this Prospectus assumes that the Portfolio will reach a size
estimated by the Sponsors and is based on a sliding fee scale that reduces the
per
 
                                       7
<PAGE>
1,000 Units Trustee's fee as the size of the Portfolio increases. The Trustee's
annual fee is payable in monthly installments. The Trustee also benefits when it
holds cash for the Portfolio in non-interest bearing accounts. Possible
additional charges include Trustee fees and expenses for extraordinary services,
costs of indemnifying the Trustee and the Sponsors, costs of action taken to
protect the Portfolio and other legal fees and expenses, Portfolio termination
expenses and any governmental charges. The Trustee has a lien on Portfolio
assets to secure reimbursement of these amounts and may sell Securities for this
purpose if cash is not available. The Sponsors receive an annual fee currently
estimated at $0.35 per 1,000 Units to reimburse them for the cost of providing
Portfolio supervisory services to the Portfolio. While the fee may exceed their
costs of providing these services to the Portfolio, the total supervision fees
from all Series of Equity Investor Fund will not exceed their costs for these
services to all of those Series during any calendar year. The Sponsors may also
be reimbursed for their costs of providing bookkeeping and administrative
services to Defined Asset Funds, currently estimated at $0.10 per 1,000 Units.
The Trustee's and Sponsors' fees may be adjusted for inflation without
investors' approval.
 
     Expenses incurred in establishing the Portfolio, including the cost of the
initial preparation of documents relating to the Portfolio, Federal and State
registration fees, the initial fees and expenses of the Trustee, legal expenses
and any other out-of-pocket expenses will be paid by the Portfolio and amortized
over the life of the Portfolio. Advertising and selling expenses will be paid
from the Underwriting Account at no charge to the Portfolio. Defined Asset Funds
can be a cost-effective way to purchase and hold investments. Annual operating
expenses are generally lower than for managed funds. Because Defined Asset Funds
have no management fees, limited transaction costs and no ongoing marketing
expenses, operating expenses are generally less than 0.25% a year. When
compounded annually, small differences in expense ratios can make a big
difference in your investment results.
 
TAXES
 
TAXATION OF THE FUND
 
     The Portfolio intends to qualify for and elect the special tax treatment
applicable to 'regulated investment companies' under Sections 851-855 of the
Internal Revenue Code of 1986, as amended (the 'Code'). Qualification and
election as a 'regulated investment company' involve no supervision of
investment policy or management by any government agency. If the Portfolio
qualifies as a 'regulated investment company' and distributes to investors 90%
or more of its taxable income, excluding its net capital gain (i.e., the excess
of its net long-term capital gain over its net short-term capital loss), it will
not be subject to Federal income tax on the portion of its taxable income
(including any net capital gain) it distributes to investors in a timely manner.
In addition, the Portfolio will not be subject to the 4% excise tax on certain
undistributed income of 'regulated investment companies' to the extent it
distributes to investors in a timely manner at least 98% of its taxable income
(including any net capital gain). It is anticipated that the Portfolio will not
be subject to Federal income tax or the excise tax, because the Indenture
requires the distribution of the Portfolio's taxable income (including any net
capital gain) in a timely manner. Although all or a portion of the Portfolio's
taxable income (including any net capital gain) for any calendar year may be
distributed shortly after the end of the calendar year, such a distribution will
be treated for Federal income tax purposes as having been received by investors
during the calendar year.
 
DISTRIBUTIONS
 
     Distributions to investors of the Portfolio's dividend income and net
short-term capital gain in any year will generally be taxable as ordinary income
to investors to the extent of the Portfolio's taxable income (other than taxable
income attributable to its net capital gain) for that year. Distributions in
excess of the Portfolio's taxable income will be treated as a return of capital
and will reduce the investor's basis in his Units and, to the extent that such
distributions exceed his basis, will be treated as a gain from the sale of his
Units as discussed below. It is anticipated that substantially all of the
distributions of the Portfolio's net capital gains will be designated as capital
gain dividends and that the Portfolio's dividend income and net short-term
capital gain will be taxable as ordinary income to investors.
 
   
     Distributions that are taxable as ordinary income to investors will
constitute dividends for Federal income tax purposes. Certain corporate
investors will be eligible for the 70% dividends-received deduction to the
extent that the distributions are appropriately designated by the Portfolio and
are attributable to eligible dividends received by the Portfolio from domestic
issuers with respect to whose Securities the Portfolio satisfies the
requirements for the dividends-received deduction. The 46-day holding period for
the dividends-received deduction must begin before and
 
                                       8
<PAGE>
include each ex-dividend date and excludes the purchase date and any days during
which the investor's investment is hedged. Depending upon the particular
corporate investor's circumstances, additional limitations on the availability
of the dividends-received deduction may be applicable. Further, legislative and
regulatory proposals arise from time to time that would adversely affect the
after-tax returns to investors that can take advantage of the deduction.
Investors are urged to consult their own tax advisers in this regard.
 
     Distributions of the Portfolio's net capital gain that are designated as
capital gain dividends by the Portfolio will be taxable to investors as
long-term capital gain, regardless of the time the investor has held his Units.
However, if the Portfolio were to terminate in less than one year, the Portfolio
would not distribute any capital gain dividends. The Internal Revenue Service
has issued a notice (with interim guidance) of forthcoming temporary regulations
to permit a regulated investment company such as the Fund to designate its
dividends, subject to certain limitations, as 20% or 28% rate gain
distributions, which individual investors may be entitled to treat as long-term
capital gain in the 20% or 28% groups respectively. The Trustee will provide
necessary additional information with periodic statements to investors, who
should consult their tax advisers regarding these matters.
    
 
     An investor, other than a dealer in securities, will generally recognize
capital gain or loss when the investor disposes of his Units (by sale,
redemption or otherwise). In the case of a distribution of Securities to an
investor upon redemption of his Units, gain or loss will generally be recognized
in an amount equal to the difference between the investor's tax basis in his
Units and the fair market value of the Securities received in redemption. Net
capital gain may be taxed at a lower rate than ordinary income for certain
individuals and other non-corporate taxpayers, and investors who are individuals
and have held their Units for more than 18 months may be entitled to a 20%
maximum federal tax rate for gains from the sale of these Units. Any such
capital gain or loss asset is long-term if the asset is held for more than one
year and short-term if held one year or less. However, any capital loss on the
sale or redemption of a Unit that an investor has held for six months or less
will be a long-term capital loss to the extent of any capital gain dividends
previously distributed to the investor by the Portfolio, although the proper
treatment of this long-term capital loss remains uncertain pending further
consideration by the Internal Revenue Service. The deduction of capital loss is
subject to limitations.
 
     The investor's basis in his Units will be equal to the cost of his Units,
including the initial sales charge. A portion of the sales charge is deferred
until the termination of the Portfolio or the redemption of the Units. The
proceeds received by an investor upon such event will reflect deduction of the
deferred amount. The relevant tax reporting forms received by investors will
reflect the actual amounts paid to them, net of the deferred sales charge.
Accordingly, investors should not increase their basis in their Units by the
deferred sales charge amount.
 
     Investors will be taxed in the manner described above regardless of whether
distributions from the Portfolio are actually received by the investor or are
reinvested pursuant to the reinvestment plan. The Federal tax status of each
year's distributions will be reported to investors and to the Internal Revenue
Service. The Portfolio intends to report to each investor, no later than January
31, the amount of distributions to that investor.
 
     The foregoing discussion summarizes only certain U.S. Federal income tax
consequences of an investment in Units by investors who are U.S. persons, as
defined in the Code. Foreign investors (including nonresident alien individuals
and foreign corporations) not engaged in U.S. trade or business will generally
be subject to 30% withholding tax (or lower applicable treaty rate) on dividend
distributions by the Portfolio. Investors may be subject to taxation in New York
or in other U.S. or foreign jurisdictions and should consult their own tax
advisers in this regard.
 
RETIREMENT PLANS
 
     This Series of Equity Investor Fund may be well suited for purchase by
Individual Retirement Accounts ('IRAs'), Keogh plans, pension funds and other
qualified retirement plans, certain of which are briefly described below.
Generally, capital gains and income received in each of the foregoing plans are
exempt from Federal taxation. All distributions from such plans are generally
treated as ordinary income but may, in some cases, be eligible for special 5 or
10 year averaging (prior to the year 2000) or tax-deferred rollover treatment.
Holders of Units in IRAs, Keogh plans and other tax-deferred retirement plans
should consult their plan custodian as to the appropriate disposition of
distributions. Investors considering participation in any of these plans should
review specific tax laws related thereto and should consult their attorneys or
tax advisers with respect to the establishment and maintenance of any of these
plans. These plans are generally offered by brokerage firms, including the
Sponsors of this Portfolio, and other financial institutions. Fees and charges
with respect to such plans may vary.
 
                                       9
<PAGE>
     Retirement Plans for the Self-Employed--Keogh Plans. Units may be purchased
by retirement plans established for self-employed individuals, partnerships or
unincorporated companies ('Keogh plans'). The assets of a Keogh plan must be
held in a qualified trust or other arrangement which meets the requirements of
the Code. Keogh plan participants may also establish separate IRAs (see below)
to which they may contribute up to an additional $2,000 per year ($4,000 in a
spousal account).
 
     Individual Retirement Account--IRA. Any individual can make use of a
qualified IRA arrangement for the purchase of Units. Any individual (including
one covered by an employer retirement plan) can make a contribution to an IRA
equal to the lesser of $2,000 ($4,000 in a spousal account) or 100% of earned
income; such investment must be made in cash. However, the deductible amount of
a contribution by an individual covered by an employer retirement plan will be
reduced if the individual's adjusted gross income exceeds $25,000 (in the case
of a single individual), $40,000 (in the case of a married individual filing a
joint return) or $200 (in the case of a married individual filing a separate
return). These income threshholds will gradually be increased by 2004 to $50,000
for a single individual and $80,000 for a married individual filing jointly.
Certain transactions which are prohibited under Section 408 of the Code will
cause all or a portion of the amount in an IRA to be deemed to the distributed
and subject to tax at that time. Unless nondeductible contributions were made in
1987 or a later year, all distributions from an IRA will be treated as ordinary
income but generally are eligible for tax-deferred rollover treatment. Taxable
distributions made before attainment of age 59 1/2, except in the case of the
participant's death or disability or where the amount distributed is part of a
series of substantially equal periodic (at least annual) payments that are to be
made over the life expectancies of the participant and his or her beneficiary,
are generally subject to a surtax in an amount equal to 10% of the distribution.
The 10% surtax will be waived for withdrawals for certain educational and
first-time homebuyer expenses. The Taxpayer Relief Act of 1997 also provides,
subject to certain income limitations, for a special type of IRA under which
contributions would be non-deductible but distributions would be tax-free if the
account were held for at least five years and the account holder was at least
59 1/2 at the time of the distribution.
 
     Corporate Pension and Profit-Sharing Plans. A pension or profit-sharing
plan for employees of a corporation may purchase Units.
 
RECORDS AND REPORTS
 
     The Trustee keeps a register of the names, addresses and holdings of all
investors. The Trustee also keeps records of the transactions of the Portfolio,
including a current list of the Securities and a copy of the Indenture, which
may be inspected by investors at reasonable times during business hours.
 
     With each distribution, the Trustee includes a statement of the amounts of
income and any other receipts being distributed. The Trustee sends each investor
of record an annual report summarizing transactions in the Portfolio's accounts
including amounts distributed from them during the year, identifying Securities
sold and purchased and listing Securities held and the number of Units
outstanding and stating the Redemption Price per 1,000 Units at year end, and
the fees and expenses paid by the Portfolio, among other matters. Portfolio
accounts are audited annually by independent accountants selected by the
Sponsors and audited financial statements are available from the Trustee on
request.
 
TRUST INDENTURE
 
     The Portfolio is a 'unit investment trust' created under New York law by a
Trust Indenture among the Sponsors and the Trustee. This Prospectus summarizes
various provisions of the Indenture, but each statement is qualified in its
entirety by reference to the Indenture.
 
     The Indenture may be amended by the Sponsors and the Trustee without
consent by investors to cure ambiguities or to correct or supplement any
defective or inconsistent provision, to make any amendment required by the SEC
or other governmental agency or to make any other change not materially adverse
to the interest of investors (as determined in good faith by the Sponsors). The
Indenture may also generally be amended upon consent of investors holding 51% of
the Units. No amendment may reduce the interest of any investor in the Portfolio
without the investor's consent or reduce the percentage of Units required to
consent to any amendment without unanimous consent of investors. Investors will
be notified of the substance of any amendment.
 
                                       10
<PAGE>
     The Trustee may resign upon notice to the Sponsors. It may be removed by
investors holding 51% of the Units at any time or by the Sponsors without the
consent of investors if it becomes incapable of acting or bankrupt, its affairs
are taken over by public authorities, or if under certain conditions the
Sponsors determine in good faith that its replacement is in the best interest of
the investors. The resignation or removal becomes effective upon acceptance of
appointment by a successor; in this case, the Sponsors will use their best
efforts to appoint a successor promptly; however, if upon resignation no
successor has accepted appointment within 30 days after notification, the
resigning Trustee may apply to a court of competent jurisdiction to appoint a
successor.
 
     Any Sponsor may resign so long as one Sponsor with a net worth of
$2,000,000 remains. A new Sponsor may be appointed by the remaining Sponsors and
the Trustee to assume the duties of the resigning Sponsor. If there is only one
Sponsor and it fails to perform its duties or becomes incapable of acting or
bankrupt or its affairs are taken over by public authorities, the Trustee may
appoint a successor Sponsor at reasonable rates of compensation, terminate the
Indenture and liquidate the Portfolio or continue to act as Trustee without a
Sponsor. Merrill Lynch, Pierce, Fenner & Smith Incorporated has been appointed
as Agent for the Sponsors by the other Sponsors.
 
     The Sponsors and the Trustee are not liable to investors or any other party
for any act or omission in the conduct of their responsibilities absent bad
faith, willful misfeasance, negligence (gross negligence in the case of a
Sponsor) or reckless disregard of duty. The Indenture contains customary
provisions limiting the liability of the Trustee.
 
MISCELLANEOUS
 
LEGAL OPINION
 
     The legality of the Units has been passed upon by Davis Polk & Wardwell,
450 Lexington Avenue, New York, New York 10017, as special counsel for the
Sponsors.
 
AUDITORS
 
     The Statement of Condition in Part A of the Prospectus was audited by
Deloitte & Touche LLP, independent accountants, as stated in their opinion. It
is included in reliance upon that opinion given on the authority of that firm as
experts in accounting and auditing.
 
TRUSTEE
 
     The Trustee and its address are stated on the back cover of the Prospectus.
The Trustee is subject to supervision by the Federal Deposit Insurance
Corporation, the Board of Governors of the Federal Reserve System and the New
York State banking authorities.
 
SPONSORS
 
     The Sponsors are listed on the back cover of the Prospectus. They may
include Merrill Lynch, Pierce, Fenner & Smith Incorporated, a wholly-owned
subsidiary of Merrill Lynch Co. Inc.; PaineWebber Incorporated, a wholly-owned
subsidiary of PaineWebber Group Inc.; and Dean Witter Reynolds, Inc., a
principal operating subsidiary of Morgan Stanley, Dean Witter, Discover & Co.
Each Sponsor, or one of its predecessor corporations, has acted as Sponsor of a
number of series of unit investment trusts. Each Sponsor has acted as principal
underwriter and managing underwriter of other investment companies. The
Sponsors, in addition to participating as members of various selling groups or
as agents of other investment companies, execute orders on behalf of investment
companies for the purchase and sale of securities of these companies and sell
securities to these companies in their capacities as brokers or dealers in
securities.
 
CODE OF ETHICS
 
     The Agent for the Sponsors has adopted a code of ethics requiring
preclearance and reporting of personal securities transactions by its personnel
who have access to information on Defined Asset Funds portfolio transactions.
The code is intended to prevent any act, practice or course of conduct which
would operate as a fraud or deceit on any Portfolio and to provide guidance to
these persons regarding standards of conduct consistent with the Agent's
responsibilities to the Defined Asset Funds.
 
                                       11
<PAGE>
PUBLIC DISTRIBUTION
 
     During the initial offering period and thereafter to the extent additional
Units continue to be offered for sale to the public by means of this Prospectus,
Units will be distributed directly to the public by this Prospectus at the
Public Offering Price determined in the manner provided above. The Sponsors
intend to qualify Units for sale in all states in which qualification is deemed
necessary through the Underwriting Account and by dealers who are members of the
National Association of Securities Dealers, Inc.. The Sponsors do not intend to
qualify Units for sale in any foreign countries and this Prospectus does not
constitute an offer to sell Units in any country where Units cannot lawfully be
sold.
 
UNDERWRITERS' AND SPONSORS' PROFITS
 
     Upon sale of the Units, the Underwriters will be entitled to receive sales
charges; each Underwriters' interest in the Underwriting Account will depend on
the number of Units acquired through the issuance of additional Units. The
Sponsors also realize a profit or loss on deposit of the Securities equal to the
difference between the cost of the Securities to the Portfolio (based on the
aggregate value of the Securities on their date of deposit) and the purchase
price of the Securities to the Sponsors plus commissions payable by the
Sponsors. In addition, a Sponsor or Underwriter may realize profits or sustain
losses on Securities it deposits in the Portfolio which were acquired from
underwriting syndicates of which it was a member. During the initial offering
period, the Underwriting Account also may realize profits or sustain losses as a
result of fluctuations after the initial date of deposit in the Public Offering
Price of the Units. In maintaining a secondary market for Units, 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
these Units (which include the sales charge) or the prices at which they redeem
the Units. Cash, if any, made available by buyers of Units to the Sponsors prior
to a settlement date for the purchase of Units may be used in the Sponsors'
businesses to the extent permitted by Rule 15c3-3 under the Securities Exchange
Act of 1934 and may be of benefit to the Sponsors.
 
PERFORMANCE INFORMATION
 
     Total returns, average annualized returns or cumulative returns for various
periods of the Portfolio may be included from time to time in advertisements,
sales literature and reports to current or prospective investors. Total return
shows changes in Unit price during the period plus reinvestment of dividends and
capital gains, divided by the maximum public offering price. Average annualized
returns show the average return for stated periods of longer than a year.
Figures for actual Portfolios reflect deduction of all Portfolio expenses and
unless otherwise stated the maximum sales charge. No provision is made for any
income taxes payable. Returns of the Portfolio may also be shown in comparison
to the S&P 500 Index, to which may be added by year various national and
international political and economic events, milestones in price and market
indicators, and offerings of Defined Asset Funds. This performance may also be
compared for various periods with investments in short-term U.S. Treasury
securities. Investors should bear in mind that this represents past performance
and is no assurance of future results of the current or any future Portfolio.
Advertisements and other material distributed to prospective investors may
include the average annual compounded rate of return on selected types of assets
for periods of at least 10 years, as compiled by Ibbotson Associates, compared
to the rate of inflation over the same period.
 
                                       12
<PAGE>
     The following chart shows the average annual compounded rate of return of
selected asset classes over the 10-year and 20-year periods ending December 31,
1996, compared to the rate of inflation over the same periods. Of course, this
chart represents past performance of these investments and is no guarantee of
future results, either of these categories or of any Defined Fund. Defined Funds
also have sales charges and expenses which are not reflected in the chart.
 

Stocks (S&P 500)
20 yr                                               14.55%
10 yr                                                  15.28%
Small-company stocks
20 yr                                                             17.84%
10 yr                                         12.98%
Long-term corporate bonds
20 yr                            9.71%
10 yr                           9.48%
U.S. Treasury bills (short-term)
20 yr                  7.28%
10 yr          5.46%
Consumer Price Index
20 yr         5.15%
10 yr  3.70%

 
Stocks
20 yr
10 yr
Small-
20 yr
10 yr
Long-t
20 yr
10 yr
U.S. T
20 yr
10 yr
Consum
20 yr
10 yr
0       22%

 
                     Source: Ibbotson Associates. Used with permission. All
rights reserved.
 
DEFINED ASSET FUNDS
 
     For decades informed investors have purchased unit investment trusts for
dependability and professional selection of investments. Defined Asset Funds'
philosophy is to allow investors to 'buy with knowledge' (because, unlike
managed funds, the portfolio is generally fixed) and 'hold with confidence'
(because the portfolio is professionally selected and regularly reviewed).
Defined Asset Funds offers an array of simple and convenient investment choices,
suited to fit a wide variety of personal financial goals--a buy and hold
strategy for capital accumulation, such as for children's education or
retirement or regular current income consistent with the preservation of
principal. Unit investment trusts are particularly suited for investors who
prefer to seek long-term profits by purchasing and holding investments, rather
than through active trading. Few individuals have the knowledge, resources or
capital to buy and hold a diversified portfolio on their own; it would generally
take a considerable sum of money to obtain the breadth and diversity that
Defined Asset Funds offer. Your investment objectives may call for a combination
of Defined Asset Funds.
 
     Defined Asset Funds reflect a buy and hold strategy that the Sponsors
believe can be more effective and less expensive than active management. This
strategy is premised on selection criteria and procedures, diversification and
regular review by investment professionals. Various advertisements and sales
literature may summarize the results of economic studies concerning how stock
movement has tended to be concentrated and how longer-term investments can tend
to reduce risk.
 
     One of the most important investment decisions you face may be how to
allocate your investments among asset classes. Diversification among different
kinds of investments can balance the risks and rewards of each one. Most
investment experts recommend stocks for long-term capital growth. Defined equity
funds offer growth potential and some protection against inflation.
 
SUPPLEMENTAL INFORMATION
 
     Upon writing or calling the Trustee shown on the back cover of this
Prospectus, investors will receive without charge supplemental information about
the Portfolio, which has been filed with the SEC. The supplemental information
includes more detailed risk factor disclosure about the types of securities that
may be part of the Portfolio and general information about the structure and
operation of the Portfolio.
 
                                       13
<PAGE>

 
                                DEFINED
                             ASSET FUNDSSM
 

SPONSORS:                          EQUITY INVESTOR FUND
Merrill Lynch,                     WESTERN PREMIER PORTFOLIO
Pierce, Fenner & Smith Incorporated
Defined Asset Funds
P.O. Box 9051                      This Prospectus does not contain all of the
Princeton, NJ 08543-9051           information with respect to the investment
(609) 282-8500                     company set forth in its registration
PaineWebber Incorporated           statement and exhibits relating thereto which
1200 Harbor Boulevard              have been filed with the Securities and
Weehawken, NJ 07087                Exchange Commission, Washington, D.C. under
(201) 902-3000                     the Securities Act of 1933 and the Investment
Dean Witter Reynolds Inc.          Company Act of 1940, and to which reference
Two World Trade Center--59th Floor is hereby made. Copies of filed material can
New York, NY 10048                 be obtained from the Public Reference Section
(212) 392-2222                     of the Commission, 450 Fifth Street, N.W.,
TRUSTEE:                           Washington, D.C. 20549 at prescribed rates.
   
The Bank of New York               The Commission also maintains a Web site that
Unit Investment Trust Department   contains information statements and other
Box 974 - Wall Street Division     information regarding registrants such as
New York, NY 10268-0974            Defined Asset Funds that file electronically
1-800-221-7771                     with the Commission at http://www.sec.gov.
    
                                   ------------------------------
                                   No person is authorized to give any
                                   information or to make any representations
                                   with respect to this investment company not
                                   contained in its registration statement and
                                   related exhibits; and any information or
                                   representation not contained therein must not
                                   be relied upon as having been authorized.
                                   ------------------------------
                                   When Units are no longer available, or for
                                   investors who will reinvest into subsequent
                                   Portfolios, this Prospectus may be used as a
                                   preliminary prospectus for a future series;
                                   in which case investors should note the
                                   following:
                                   Information contained herein is subject to
                                   amendment. A registration statement relating
                                   to securities of a future series has been
                                   filed with the Securities and Exchange
                                   Commission. These securities may not be sold
                                   nor may offers to buy be accepted prior to
                                   the time the registration statement becomes
                                   effective.
                                   This Prospectus shall not constitute an offer
                                   to sell or the solicitation of an offer to
                                   buy nor shall there be any sale of these
                                   securities in any State in which such offer
                                   solicitation or sale would be unlawful prior
                                   to registration or qualification under the
                                   securities laws of any such State.

 
   
                                                      11365--2/98
    
<PAGE>
                                    PART II
             ADDITIONAL INFORMATION NOT INCLUDED IN THE PROSPECTUS
 

A. The following information relating to the Depositors is incorporated by 
reference to the SEC
filings indicated and made a part of this Registration Statement.

 
 I. Bonding arrangements of each of the Depositors are incorporated by reference
to Item A of Part II to the Registration Statement on Form S-6 under the
Securities Act of 1933 for Municipal Investment Trust Fund, Monthly Payment
Series--573 Defined Asset Funds (Reg. No. 333-08241).
 
 II. The date of organization of each of the Depositors is set forth in Item B
of Part II to the Registration Statement on Form S-6 under the Securities Act of
1933 for Municipal Investment Trust Fund, Monthly Payment Series--573 Defined
Asset Funds (Reg. No. 333-08241) and is herein incorporated by reference
thereto.
 
III. The Charter and By-Laws of each of the Depositors are incorporated herein
by reference to Exhibits 1.3 through 1.12 to the Registration Statement on Form
S-6 under the Securities Act of 1933 for Municipal Investment Trust Fund,
Monthly Payment Series--573 Defined Asset Funds (Reg. No. 333-08241).
 
IV. Information as to Officers and Directors of the Depositors has been filed
pursuant to Schedules A and D of Form BD under Rules 15b1-1 and 15b3-1 of the
Securities Exchange Act of 1934 and is incorporated by reference to the SEC
filings indicated and made a part of this Registration Statement:
 

Merrill Lynch, Pierce, Fenner & Smith Incorporated                 8-7221
            PaineWebber Incorporated........................      8-16267
            Dean Witter Reynolds Inc. ......................      8-14172

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

B.  The Internal Revenue Service Employer Identification Numbers of the Sponsors
and Trustee are as follows:
 
            Merrill Lynch, Pierce, Fenner & Smith Incorporated   13-5674085
            Dean Witter Reynolds Inc. ......................     94-0899825
            PaineWebber Incorporated .......................     13-2638166
   
            The Bank of New York, Trustee...................     13-4941102
    

 
                                  UNDERTAKING
The Sponsors undertake that they will not make any amendment to the Supplement
to this Registration Statement which includes material changes without
submitting the amendment for Staff review prior to distribution.
 
                                      II-1
<PAGE>
   
               SERIES OF EQUITY INCOME FUND, EQUITY INVESTOR FUND
                AND DEFINED ASSET FUNDS MUNICIPAL INSURED SERIES
        DESIGNATED PURSUANT TO RULE 487 UNDER THE SECURITIES ACT OF 1933
 

                                                                    SEC
SERIES NUMBER                                                   FILE NUMBER
- --------------------------------------------------------------------------------
Equity Investor Fund, Focus Series Financial Portfolio......          333-32179
Equity Investor Fund, Standard & Poor's Industry Turnaround
Portfolio...................................................          333-39121
Equity Income Fund, Investment Philosophy Series 1991
Selected Industrial Portfolio...............................           33-39158
Equity Income Fund, Select Ten Portfolio--1995 Winter
Series......................................................           33-55811
Equity Income Fund, Select Ten Portfolio--1995 Spring
Series......................................................           33-55807
Equity Income Fund, Select Ten Portfolio 1997 Series A......          333-15193
Equity Income Fund, Select Growth Portfolio.................           33-51985
Defined Asset Funds Municipal Insured Series................           33-54565
    

 
                       CONTENTS OF REGISTRATION STATEMENT
The Registration Statement on Form S-6 comprises the following papers and
documents:
 
     The facing sheet of Form S-6.
 
     The Cross-Reference Sheet (incorporated by reference from the
Cross-Reference Sheet of the Registration Statement of Defined Asset Funds
Municipal Insured Series, 1933 Act File No. 33-54565).
 
     The Prospectus.
 
     Additional Information not included in the Prospectus (Part II).
 
     The following exhibits:
 

1.1     --Form of Trust Indenture (incorporated by reference to Exhibit 1.1 to
          the Registration Statement of Equity Income Fund, Select S&P
          Industrial Portfolio 1997 Series A, 1933 Act File No. 333-05683.
1.1.1   --Form of Standard Terms and Conditions of Trust Effective as of October
          21, 1993 (incorporated by reference to Exhibit 1.1.1 to the
          Registration Statement of Municipal Investment Trust Fund, Multistate
          Series-48, 1933 Act File No. 33-50247).
1.2     --Form of Master Agreement Among Underwriters (incorporated by reference
          to Exhibit 1.2 to the Registration Statement under the Securities Act
          of 1933 of The Corporate Income Fund, One Hundred Ninety-Fourth
          Monthly Payment Series, 1933 Act File No. 2-90925).
3.1     --Opinion of counsel as to the legality of the securities being issued
          including their consent to the use of their name under the headings
          'Taxes' and 'Miscellaneous--Legal Opinion' in the Prospectus.
5.1     --Consent of independent accountants.
9.1     --Information Supplement (incorporated by reference to Exhibit 9.1 to
          the Registration Statement of Equity Income Fund, Select Ten
          Portfolio, 1996 International Series B (United Kingdom and Japan
          Portfolios), 1933 Act File No. 333-00593).
   
    

 
                                      R-1
<PAGE>
                                   SIGNATURES
   
The registrant hereby identifies the series numbers of Equity Income Fund,
Equity Investor Fund and Defined Asset Funds Municipal Insured Series listed on
page R-1 for the purposes of the representations required by Rule 487 and
represents the following:
 
     1) That the portfolio securities deposited in the series as to which this
        registration statement is being filed do not differ materially in type
        or quality from those deposited in such previous series;
 
     2) That, except to the extent necessary to identify the specific portfolio
        securities deposited in, and to provide essential financial information
        for, the series with respect to which this registration statement is
        being filed, this registration statement does not contain disclosures
        that differ in any material respect from those contained in the
        registration statements for such previous series as to which the
        effective date was determined by the Commission or the staff; and
 
     3) That it has complied with Rule 460 under the Securities Act of 1933.
 
     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT
HAS DULY CAUSED THIS REGISTRATION STATEMENT OR AMENDMENT TO THE REGISTRATION
STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED THEREUNTO DULY
AUTHORIZED IN THE CITY OF NEW YORK AND STATE OF NEW YORK ON THE 5TH DAY OF
FEBRUARY, 1998.
    
 
                  SIGNATURES APPEAR ON PAGE R-3, R-4 AND R-5.
 
     A majority of the members of the Board of Directors of Merrill Lynch,
Pierce, Fenner & Smith Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.
 
     A majority of the members of the Executive Committee of the Board of
Directors of PaineWebber Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.
 
      A majority of the members of the Board of Directors of Dean Witter
Reynolds Inc. has signed this Registration Statement or Amendment to the
Registration Statement pursuant to Powers of Attorney authorizing the person
signing this Registration Statement or Amendment to the Registration Statement
to do so on behalf of such members.
 
                                      R-2
<PAGE>
               MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
                                   DEPOSITOR
 

By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under
  the Board of Directors of Merrill         Form SE and the following 1933 Act
  Lynch, Pierce,                            File
  Fenner & Smith Incorporated:              Number: 33-43466

 
      HERBERT M. ALLISON, JR.
      BARRY S. FREIDBERG
      EDWARD L. GOLDBERG
      STEPHEN L. HAMMERMAN
      JEROME P. KENNEY
      DAVID H. KOMANSKY
      DANIEL T. NAPOLI
      THOMAS H. PATRICK
      JOHN L. STEFFENS
      ROGER M. VASEY
      ARTHUR H. ZEIKEL
      By DANIEL C. TYLER
       (As authorized signatory for Merrill Lynch, Pierce,
       Fenner & Smith Incorporated and
       Attorney-in-fact for the persons listed above)
 
                                      R-3
<PAGE>
                            PAINEWEBBER INCORPORATED
                                   DEPOSITOR
 

By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under
  the Executive Committee of the Board      the following 1933 Act File
  of Directors                              Number: 33-55073
  of PaineWebber Incorporated:

 
      DONALD B. MARRON
      JOSEPH J. GRANO, JR.
      By ROBERT E. HOLLEY
       (As authorized signatory for PaineWebber Incorporated
       and Attorney-in-fact for the persons listed above)
 
                                      R-4
<PAGE>
                           DEAN WITTER REYNOLDS INC.
                                   DEPOSITOR
 

By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under Form SE and the following 1933
  the Board of Directors of Dean Witter     Act File Numbers: 33-17085 and
  Reynolds Inc.:                            333-13039

 
      RICHARD M. DeMARTINI
      ROBERT J. DWYER
      CHRISTINE A. EDWARDS
      CHARLES A. FIUMEFREDDO
      JAMES F. HIGGINS
      MITCHELL M. MERIN
      STEPHEN R. MILLER
      RICHARD F. POWERS III
      PHILIP J. PURCELL
      THOMAS C. SCHNEIDER
      WILLIAM B. SMITH
      By MICHAEL D. BROWNE
       (As authorized signatory for
       Dean Witter Reynolds Inc.
       and Attorney-in-fact for the persons listed above)
 
                                      R-5
<PAGE>
                                                                     EXHIBIT 5.1
                       CONSENT OF INDEPENDENT ACCOUNTANTS
The Sponsors and Trustee of Equity Investor Fund, Western Premier Portfolio,
Defined Asset Funds:
 
We consent to the use in this Registration Statement No. 333-41757 of our report
dated February 5, 1998, relating to the Statement of Condition of Equity
Investor Fund, Western Premier Portfolio, Defined Asset Funds and to the
reference to us under the heading 'Miscellaneous--Auditors' in the Prospectus
which is a part of this Registration Statement.
 
DELOITTE & TOUCHE LLP
New York, N.Y.
February 5, 1998
****  INSERT THE TEXT OF THE 487 A-PAGES HERE  ****


<PAGE>
                                                                     EXHIBIT 3.1
                             DAVIS POLK & WARDWELL
                              450 LEXINGTON AVENUE
                            NEW YORK, NEW YORK 10017
                                 (212) 450-4000
                                                                FEBRUARY 5, 1998
EQUITY INVESTOR FUND,
WESTERN PREMIER PORTFOLIO
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
DEAN WITTER REYNOLDS INC.
PAINEWEBBER INCORPORATED
C/O MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
DEFINED ASSET FUNDS
P.O. BOX 9051
PRINCETON, N.J. 08543-9051
(609) 282-8500
Dear Sirs:
 
     We have acted as special counsel for you, as sponsors (the 'Sponsors') of
Equity Investor Fund, Western Premier Portfolio, Defined Asset Funds (the
'Fund'), in connection with the issuance of units of fractional undivided
interest in the Fund (the 'Units') in accordance with the Trust Indenture
relating to the Fund (the 'Indenture').
 
     We have examined and are familiar with originals or copies, certified or
otherwise identified to our satisfaction, of such documents and instruments as
we have deemed necessary or advisable for the purpose of this opinion.
 
     Based upon the foregoing, we are of the opinion that (i) the execution and
delivery of the Indenture and the issuance of the Units have been duly
authorized by the Sponsors and (ii) the Units, when duly issued and delivered by
the Sponsors and the Trustee in accordance with the Indenture, will be legally
issued, fully paid and non-assessable.
 
     We hereby consent to the use of this opinion as Exhibit 3.1 to the
Registration Statement relating to the Units filed under the Securities Act of
1933 and to the use of our name in such Registration Statement and in the
related prospectus under the heading 'Miscellaneous--Legal Opinion.'
 
                                          Very truly yours,
 
                                          DAVIS POLK & WARDWELL


<PAGE>
                                                                     EXHIBIT 5.1
                       CONSENT OF INDEPENDENT ACCOUNTANTS
The Sponsors and Trustee of Equity Investor Fund, Western Premier Portfolio,
Defined Asset Funds:
 
We consent to the use in this Registration Statement No. 333-41757 of our report
dated February 5, 1998, relating to the Statement of Condition of Equity
Investor Fund, Western Premier Portfolio, Defined Asset Funds and to the
reference to us under the heading 'Miscellaneous--Auditors' in the Prospectus
which is a part of this Registration Statement.
 
DELOITTE & TOUCHE LLP
New York, N.Y.
February 5, 1998

<TABLE> <S> <C>


<ARTICLE> 6
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   OTHER
<FISCAL-YEAR-END>                          JAN-30-1998
<PERIOD-END>                                FEB-5-1998
<INVESTMENTS-AT-COST>                          289,508
<INVESTMENTS-AT-VALUE>                         289,508
<RECEIVABLES>                                        0
<ASSETS-OTHER>                                  71,000
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 360,506
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       71,000
<TOTAL-LIABILITIES>                             71,000
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       289,506
<SHARES-COMMON-STOCK>                          292,430
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                   289,506
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                    0
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                       0
<NET-INVESTMENT-INCOME>                              0
<REALIZED-GAINS-CURRENT>                             0
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                                0
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        292,430
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                               0
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                      0
<AVERAGE-NET-ASSETS>                                 0
<PER-SHARE-NAV-BEGIN>                                0
<PER-SHARE-NII>                                      0
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                                  0
<EXPENSE-RATIO>                                      0
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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