<PAGE>
Summary of Essential Information
as of March 13, 1998
SIZE OF OFFERING
- -------------------------------------------
<TABLE>
<S> <C>
Aggregate Value of Securities.... $240,042.95
Number of Units.................. 25,000
</TABLE>
PRICE
- -------------------------------------------
<TABLE>
<S> <C>
Public Offering Price Per Unit
(including sales charge)..... $9.6825
Minimum Purchase: $1,000 ($250
for IRA's)
Public Offering Price Per 100
Units (including sales
charge)...................... $968.25
</TABLE>
RECORD DATES
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<TABLE>
<S> <C>
September 1, 1998 and June 18, 1999
</TABLE>
DISTRIBUTION DATES
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<TABLE>
<S> <C>
September 15, 1998 and on or about June 25, 1999
</TABLE>
TERMINATION DATE
- ------------------------------------------------
June 18, 1999
SALES CHARGE
- ------------------------------------------------
The sales charge is 2.90% of the Public Offering Price of which $20 per 100
Units is deferred. The deferred sales charge generally is paid from the proceeds
of securities sold each month commencing June 30, 1998 ($2.00 per 100 Units per
month for 10 months). Volume discounts begin on orders of $25,000 or more.
- ------------------------------------------------
<TABLE>
<S> <C>
TRUSTEE SPONSOR
The Chase Manhattan Bank Dean Witter Reynolds Inc.
270 Park Avenue 2 World Trade Center
New York, New York 10017 New York, New York 10048
</TABLE>
<PAGE>
PERFORMANCE
The following table shows (i) the performance of hypothetical one-year fixed
portfolios of approximately equal values of strategy stocks (but not any actual
trust) chosen as of the beginning of each year using the S&P Platinum Portfolio,
Select Strategy Stocks Trust selection process and (ii) the actual annual
returns of the S&P 500 Index.
<TABLE>
<CAPTION>
PLATINUM
PORTFOLIO,
SELECT
YEAR STRATEGY
ENDED 12/31 S&P 500 INDEX STOCKS
- ------------------------- --------------- -----------
<S> <C> <C>
1988 16.34% 30.36%
1989 31.23% 27.56%
1990 -3.14% -17.14%
1991 30.00% 51.68%
1992 7.43% 16.89%
1993 9.94% 2.93%
1994 1.29% 7.40%
1995 37.11% 44.25%
1996 22.70% 23.55%
1997 33.10% 12.59%
----- ------- -----------
Average annual return: 17.81% 18.41%
</TABLE>
Returns shown represent price changes plus dividend returns and do not reflect
commissions or taxes. Only the Platinum Portfolio, Select Strategy Stocks
figures reflect Trust sales charges (the full sales charges in the first year;
reduced rollover sales charges thereafter), estimated expenses and semi-annual
reinvestment of dividends. These returns are not guarantees of future
performance and should not be used as a predictor of returns to be expected in
connection with the Trust. The actual returns of a particular trust or purchase
of units of a trust will vary from hypothetical strategy returns due to, among
other things, timing differences and the fact that an actual trust has sales
charges, expenses and commissions. As indicated in the above table, the strategy
underperformed the Index in certain years and there can be no assurance that the
Trust will outperform the Index over the life of the Trust.
The number of Select Strategy Stocks in the table above ranged from a low of 9
as of January 1, 1988, to a high of 36 stocks as of January 1, 1996. It is
estimated that the number of Select Strategy Stocks will likely range from 25 to
40 for a given portfolio, although no representation can be given as to the
exact number of stocks that will qualify for a particular Trust. As the number
of stocks that are in a given portfolio decreases, performance return
fluctuation and risk are likely to increase. For the performance period shown
above, the hypothetical strategy stocks portfolio had an average turnover of
stocks year to year of approximately 67%.
Performance data quoted represents past performance and the investment return
and principal value of an investment will fluctuate so that an investor's units,
when redeemed or sold, may be worth more or less than their original cost.
<PAGE>
SCHEDULE OF PORTFOLIO SECURITIES
STANDARD & POOR'S PLATINUM PORTFOLIO,
SELECT STRATEGY STOCKS -- MARCH 1998
ON DATE OF DEPOSIT, MARCH 13, 1998
<TABLE>
<CAPTION>
PROPORTIONATE PERCENTAGE OF
RELATIONSHIP AGGREGATE PRICE PER
PORTFOLIO NUMBER OF BETWEEN NO. OF MARKET VALUE SHARE TO
NO. NAME OF ISSUER SHARES SHARES OF TRUST TRUST
- ------------- ------------------------------- ----------- -------------- -------------- -----------
<C> <S> <C> <C> <C> <C>
1. Adaptec, Inc. 255 3.56% 2.54% $ 23.9375
2. Analog Devices, Inc. 176 2.46 2.47 33.7500
3. Applied Materials, Inc. 177 2.47 2.50 33.8750
4. Boston Scientific Corp. 88 1.23 2.50 68.2500
5. Cadence Design Systems, Inc. 176 2.46 2.46 33.5000
6. Canadaigua Brands 110 1.54 2.51 54.8750
7. Cisco Systems, Inc. 94 1.31 2.53 64.5625
8. Consolidated Stores Corp. 141 1.97 2.51 42.6875
9. Dura Pharmaceuticals, Inc. 241 3.37 2.49 24.8125
10. EMC Corp. 161 2.25 2.52 37.5000
11. ENSCO International Inc. 221 3.09 2.50 27.1875
12. Express Scripts, Inc. 74 1.03 2.50 81.0000
13. Franklin Resources, Inc. 112 1.57 2.50 53.5000
14. General Nutrition Companies 148 2.07 2.51 40.7500
15. Global Marine Inc. 265 3.70 2.51 22.7500
16. Green Tree Financial Corp. 201 2.81 2.50 29.8125
17. Health Management Associates, 215 3.01 2.49 27.7500
Inc.
18. Hyperion Software Corp. 149 2.08 2.54 41.0000
19. Lone Star Steakhouse & Saloon, 273 3.82 2.50 22.0000
Inc.
20. MBNA Corp. 171 2.39 2.51 35.2500
21. NAC Re Corp. 120 1.66 2.49 49.8125
22. NationsBank Corp. 87 1.22 2.51 69.1250
23. Network Associates 87 1.22 2.50 68.8750
24. News Corp. Ltd. 222 3.10 2.52 27.2500
25. Noble Drilling Corp. 224 3.13 2.46 26.5625
26. OfficeMax, Inc. 357 4.99 2.49 16.7500
27. Oracle Corporation 207 2.89 2.52 29.1875
28. Panamerican Beverages, Inc. 162 2.26 2.50 37.0625
29. Parametric Technology Corp. 178 2.49 2.46 33.1875
30. Photronics, Inc. 232 3.24 2.50 25.8750
31. Proffitt's, Inc. 160 2.24 2.50 37.5000
32. QUALCOMM Inc. 122 1.71 2.44 48.0625
33. Quorum Health Group Inc. 204 2.85 2.49 29.2500
34. Safeway Inc. 168 2.35 2.49 35.6250
35. Sierra Health Services Inc. 154 2.15 2.53 39.3750
36. Staples, Inc. 266 3.72 2.49 22.4375
37. Transatlantic Holdings, Inc. 79 1.10 2.51 76.3750
38. Tyco International Ltd. 110 1.54 2.50 54.6250
39. Vishay Intertechnology, Inc. 285 3.98 2.49 20.9375
40. Wendy's International, Inc. 282 3.94 2.51 21.3750
-----
7,154
-----
-----
</TABLE>
<PAGE>
INVEST IN A FIXED PORTFOLIO OF STOCKS BASED UPON STANDARD & POOR'S* RESEARCH FOR
AS LITTLE AS $1,000 ($250 FOR IRA'S)
SELECT EQUITY TRUSTS
Achieving financial success in today's dynamic marketplace depends on selecting
the right strategy. Although investment trends come and go, one fundamental
philosophy does not change -- choose stocks whose performance potential make
them worth the price. By blending the analytical power of Standard & Poor's with
the simplicity of a Unit Investment Trust, Dean Witter has developed Standard &
Poor's Platinum Portfolio, Select Strategy Stocks -- an opportunity for capital
appreciation from a fixed portfolio of stocks based upon Standard & Poor's
research.
PORTFOLIO SELECTION
The Platinum Portfolio, Select Strategy Stocks unit trust seeks capital
appreciation by investing for one year in a pre-determined group of stocks
selected from the Standard & Poor's "Platinum Portfolio" through an exclusive
two-part selection process. First, companies are identified that satisfy
appreciation potential and value criteria for Standard & Poor's prestigious
"Platinum Portfolio" on-going research model. Then further selection screens are
applied to arrive at the portfolio of the Trust.
The foundation of this Trust is based upon Standard & Poor's stock rankings
(from a low of "1" to a high of "5") under its two analytical systems for its
"Platinum Portfolio": (1) the fundamental STock Appreciation Ranking System
(STARS); and (2) the quantitative Fair Value Model (FVM). To be considered for
selection into the Trust's portfolio, a stock must carry a "5" in either system
and, in addition, have a minimum ranking of "3" in the other category. Of these
stocks, companies with market capitalizations below $500 million at the time of
the Trust's formation are excluded. The remaining stocks are selected for the
Trust.
RISKS
Investors should note that the Trust is not S&P's Platinum Portfolio, which S&P
actively reviews and is expected to continually change, based upon its changes
to STARS and FVM stock rankings. Thus, S&P's Platinum Portfolio is intended more
for traders than long term investors due to the frequent changes that S&P is
likely to make to its STARS and FVM rankings.**
The portfolio of the Trust is an unmanaged fixed portfolio. It is based on a
longer term strategy, applying the additional Trust ranking and market
capitalization criteria to S&P's Platinum Portfolio, at the time of the Trust's
formation (March 13, 1998), to select and hold stocks for the life of the Trust.
Therefore, regardless of any changes to S&P's Platinum Portfolio (or S&P stock
ranking or in market capitalization), the identity and proportionate
relationship of the Portfolio's Securities generally will remain the same as
shown in "Portfolio of Securities."
The Trust is not an appropriate investment for those seeking high current income
or capital preservation. Investors must be able and willing to assume the risks
associated with equity investing in a fixed portfolio of common stocks. Risks of
investing in common stocks such as the Trust's securities include price
volatility resulting from factors affecting particular common stock and the
equity markets in general. See the prospectus for more complete information
concerning risks.
SHORT-TERM LIFE
The Trust will terminate in approximately one year. The portfolio will then
either be liquidated or distributed to unitholders in-kind at their election.
You may, of course, sell or redeem your Units prior to the Trust's termination.
Although the Trust is a one year investment, the strategy is long term.
Investors should consider reinvesting in successive trusts (if available), for
example, for at least three to five years, to take advantage of the long term
strategy.
NO TURNOVER
As an unmanaged investment, the Trust typically has no turnover of stocks during
its life. Unitholders know exactly where their money is invested. Managed
investment portfolios may have very high turnover rates over a one-year period.
EASY LIQUIDITY
All or a portion of your Units may be liquidated at any time, based on net asset
value (including deduction for any unpaid deferred sales charge). The price you
receive will reflect market conditions and could be more or less than the price
originally paid. Investors may at termination choose to receive their share of
the Trust's actual underlying securities.
SUITED FOR RETIREMENT ACCOUNTS
This Trust may be an attractive investment vehicle for a self-directed IRA or
self-employed retirement plan ("Keogh plan"). Unless held in an IRA or other
tax-deferred vehicle there may be current tax consequences associated with an
investment in this type of unit investment trust. As a diversified
growth-oriented investment it may be a suitable complement to help achieve
overall portfolio diversification.
NO MARKET TIMING
The Trust leaves "emotional trading" behind by focusing and buying a portfolio
of stocks researched by Standard & Poor's. Due to the Trust's "buy and hold"
strategy, an investor's money is generally invested at all times. Managed
investment vehicles buy and sell securities and may have a sizable percentage of
assets in cash.
ROLLOVER OPTION
Investors, in connection with the Trust's termination, may elect to roll over
their investment into units of a new series, if offered, subject only to the
deferred sales charge.
- ------------------------------
*Standard & Poor's, S&P and the S&P 500 are registered trademarks of The
McGraw-Hill Companies, Inc. and have been licensed for use by the Sponsor.
Platinum Portfolio, Select Strategy Stocks unit trusts are not sponsored,
managed, sold or promoted by Standard & Poor's. Standard & Poor's is not
affiliated with the Sponsor.
**Standard & Poor's Platinum Portfolio is not an actual investment offered by
Standard & Poor's, and Standard & Poor's does not currently manage any actual
investments based upon its Platinum Portfolio.
FOR A COPY OF THE PROSPECTUS CONTAINING MORE COMPLETE INFORMATION INCLUDING
CHARGES, EXPENSES AND RISKS, CONTACT YOUR ACCOUNT EXECUTIVE. READ THE PROSPECTUS
CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
<PAGE>
[LOGO]
STANDARD & POOR'S
PLATINUM PORTFOLIO,
SELECT STRATEGY STOCKS-
MARCH 1998
- -FIXED UNIT INVESTMENT TRUST STRUCTURE
- - CAPITAL APPRECIATION POTENTIAL
- - DIVERSIFICATION
- - EASY LIQUIDITY
- - ROLLOVER OPTION
UNITS OF A TRUST ARE NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORP. (FDIC)
AND ARE NOT OBLIGATIONS OF, ENDORSED BY, DEPOSITS IN, OR GUARANTEED BY ANY BANK.
INVESTMENTS IN UNIT INVESTMENT TRUSTS AND OTHER PRODUCTS ARE SUBJECT TO
INVESTMENT RISK, INCLUDING THE POSSIBLE LOSS OF THE PRINCIPAL AMOUNT INVESTED.
defg
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