MORGAN STANLEY DEAN WITTER & CO
424B3, 1999-08-17
FINANCE SERVICES
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PROSPECTUS Dated May 5, 1999                        Pricing Supplement No. 23 to
PROSPECTUS SUPPLEMENT                       Registration Statement No. 333-75289
Dated May 6, 1999                                          Dated August 12, 1999
                                                                  Rule 424(b)(3)

                                   $12,000,000
                        Morgan Stanley Dean Witter & Co.
                           MEDIUM-TERM NOTES, SERIES C
                             Senior Fixed Rate Notes

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

                     Exchangeable Notes due August 17, 2005
                   Exchangeable for Shares of Common Stock of
                        Three Pharmaceutical Corporations

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

The notes will not pay any interest but will be issued at a discount and thus
have a minimum yield to maturity of 2.00%. Beginning November 17, 1999, you
will be able to exchange your notes for a basket of shares of the common stock
of three pharmaceutical corporations, which we refer to as the basket stocks,
subject to our right to call all of the notes on or after August 17, 2002.

o    The price of each note is $887.45 (88.745% of the $1,000 principal amount
     at maturity). This issue price represents a yield to maturity of 2.00% per
     year compounded semi-annually.

o    We will not make any coupon interest payments on the notes.

o    The basket consists of a fixed number of shares of each basket stock, which
     we refer to as the exchange ratio. The exchange ratio for each basket stock
     is calculated so that the value of that basket stock is an equally-weighted
     percentage of the initial basket value at the time we priced the notes on
     August 12, 1999. The exchange ratio of any basket stock will remain
     constant for the term of the notes unless adjusted for certain corporate
     events. The initial basket value is $766.6955, based on the market prices
     of the basket stocks on August 12, 1999.

o    Beginning November 17, 1999, you will have the right to exchange each note
     for the number of shares of each of the basket stocks as provided by the
     exchange ratio for that basket stock. If you exchange, we will have the
     right to deliver to you either the actual shares of the basket stocks or
     the cash value of such shares. You will not receive any accrued original
     issue discount upon exchange.

o    Beginning August 17, 2002, we have the right to call all of the notes and
     pay to you the call price, which will be a cash amount per note equal to
     the issue price of $887.45 plus accrued original issue discount, or OID, to
     the call date. However, if the sum of the products of the market price of
     each basket stock and its exchange ratio on the last trading day before we
     send our call notice is equal to or greater than the call price, we will
     deliver to you shares of each basket stock equal to its exchange ratio per
     note instead.

o    If we decide to call the notes, we will give you notice at least 30 but not
     more than 60 days before the call date specified in the notice. If we
     notify you that we will be delivering the basket stocks on the call date,
     rather than the cash call price, you will still be able to exercise your
     exchange right on any day prior to the call date.

o    If you hold the notes to maturity, we will pay $1,000 per note to you.

o The issuers of the basket stocks are not involved in this offering of the
notes in any way and will have no financial obligation with respect to the
notes.

o    The notes have been approved for listing on the American Stock Exchange,
     Inc., subject to official notice of issuance. The AMEX symbol for the notes
     is "RXM.A."

You should read the more detailed description of the notes in this pricing
supplement.  In particular, you should review and understand the descriptions
in "Summary of Pricing Supplement" and "Description of Notes."

The notes involve risks not associated with an investment in conventional debt
securities.  See "Risk Factors" beginning on PS-6.

                                -----------------
                                  PRICE 88.745%
                                -----------------

              Price to Public    Agent's Commissions    Proceeds to Company
              ---------------    -------------------    -------------------
Per Note....      88.745%               0.25%                 88.495%
Total.......    $10,649,400            $30,000              $10,619,400


                           MORGAN STANLEY DEAN WITTER

<PAGE>


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<PAGE>


                          SUMMARY OF PRICING SUPPLEMENT

      The following summary describes the notes we are offering to you in
general terms only. You should read the summary together with the more detailed
information that is contained in the rest of this pricing supplement and in the
accompanying prospectus and prospectus supplement. You should carefully
consider, among other things, the matters set forth in "Risk Factors."

                            The Notes

Each note costs $887.45     We, Morgan Stanley Dean Witter & Co., are offering
                            you Exchangeable Notes due August 17, 2005, which
                            you may exchange for a basket of shares of common
                            stock of three pharmaceutical corporations beginning
                            on November 17, 1999. We refer to the shares of
                            common stock of the three pharmaceutical
                            corporations as the basket stocks. The price of each
                            note is $887.45 (88.745% of the $1,000 principal
                            amount at maturity). We will not pay interest on the
                            notes. If you hold the notes to maturity, which is
                            August 17, 2005, we will pay $1,000 per note to you.
                            This payment represents the $887.45 issue price plus
                            a yield to maturity of 2.00% per year compounded
                            semi-annually.

                            Your Exchange Right

The initial basket          Beginning November 17, 1999, you may exchange each
value is $766.6955          note for a number of shares of each basket stock
                            equal to its exchange ratio. The exchange ratio for
                            each basket stock is calculated so that the value of
                            that basket stock is an equally-weighted percentage
                            of the initial basket value at the time we priced
                            the notes on August 12, 1999. The exchange ratio
                            with respect to each basket stock will remain
                            constant for the term of the notes unless adjusted
                            for certain corporate events relating to the issuer
                            of that basket stock. The initial basket value is
                            $766.6955, based on the market prices of the basket
                            stocks on August 12, 1999.

                            When you exchange your notes, Morgan Stanley & Co.
                            Incorporated or its successors, which we refer to as
                            MS & Co., acting as calculation agent, will
                            determine the exact number of shares of each of the
                            basket stocks you will receive based on the
                            principal amount of the notes you exchange and the
                            exchange ratio of each basket stock as it may have
                            been adjusted through the time of the exchange.

                            To exchange a note on any day, you must instruct
                            your broker or other person with whom you hold your
                            notes to take the following steps through normal
                            clearing system channels:

                            o  fill out an Official Notice of Exchange, which is
                               attached as Annex A to this pricing supplement;

                            o  deliver your Official Notice of Exchange to us
                               before 11:00 a.m. (New York City time) on that
                               day; and

                            o  deliver your note certificate to The Chase
                               Manhattan Bank, as trustee for our senior notes,
                               on that day.

                            If you give us your Official Notice of Exchange
                            after 11:00 a.m. (New York City time) on any day or
                            at any time on a day when the stock markets are
                            closed, your notice will not become effective until
                            the next day that the stock markets are open.

We can choose to pay to     We will pay to you, at our option, within 3 business
you cash or shares          days after you give us your Official Notice of
if you elect to exchange    Exchange, either:
your notes
                            o  shares of the basket stocks, or

                            o  the cash value of such shares.

                            We will not pay any accrued original issue discount
                            if you elect to exchange your notes.

                            Our right to call the notes may affect your ability
                            to exchange your notes.

Our Call Right              Beginning August 17, 2002, we have the right to call
                            all of the notes. If we call the notes, we will do
                            the following:

                            o  send a notice announcing that we have decided to
                               call the notes;

                            o  specify in the notice a call date when you will
                               receive payment in exchange for delivering your
                               notes to the trustee; that call date will not be
                               less than 30 or more than 60 days after the date
                               of the notice; and

                            o  specify in the notice the number of shares of
                               each basket stock or the cash call price that we
                               will pay to you in exchange for each note, as
                               explained in the next paragraph.


We may call the notes       On the last trading day before the date of our call
for stock or cash,          notice, the calculation agent will determine the
depending on the price      aggregate value of the shares of the basket stocks
of the basket stocks        that a noteholder would receive upon exchange of a
                            note. The sum of those values is referred to as the
                            basket value. If the basket value is less than the
                            call price (the sum of the issue price of $887.45
                            plus the yield that will have accrued on the note to
                            the call date), then we will pay the call price to
                            you in cash. If we notify you that we will give you
                            cash on the call date, you will no longer be able to
                            exercise your exchange right.

                            If, however, the basket value as so determined is
                            equal to or greater than the call price, then we
                            will deliver the shares of the basket stocks instead
                            on the call date. In that case, you will still have
                            the right to exercise your exchange right on any day
                            prior to the call date.

Basket Stocks               The following table sets forth the basket stocks,
                            the ticker symbol of each basket stock on the New
                            York Stock Exchange, Inc., the percentage of the
                            initial basket value represented by each basket
                            stock, the initial market price of each basket stock
                            at the time we priced the notes on August 12, 1999,
                            the exchange ratio of each basket stock and the
                            initial value of the aggregate shares of each basket
                            stock contained in the basket at that time:

<TABLE>
                                                                        Percent
                                                                      Represented     Initial
                                                                       in Initial      Stock    Exchange     Initial
                            Issuer of Basket Stock           Ticker   Basket Value     Price      Ratio       Value
                            ----------------------           ------   ------------     -----      -----       -----
                            <S>                              <C>      <C>            <C>        <C>         <C>
                            Bristol-Myers Squibb
                             Company ......................    BMY       33.333%      $66.3750    3.8503    $255.5637
                            Merck & Co., Inc. .............    MRK       33.333%      $61.0000    4.1896    $255.5656
                            Pfizer Inc.....................    PFE       33.333%      $33.4375    7.6431    $255.5662
</TABLE>

                            The exchange ratio of each basket stock indicates
                            the number of shares of such basket stock, given the
                            market price of the basket stock, required to be
                            included in the calculation of the initial basket
                            value so that each basket stock represents an
                            equally-weighted percentage of the initial basket
                            value. The exchange ratios will remain constant for
                            the term of the notes unless adjusted for certain
                            corporate events. See "Adjustments to the Exchange
                            Ratios and the Basket."

The Calculation Agent       We have appointed MS & Co. to act as calculation
                            agent for The Chase Manhattan Bank, the trustee for
                            our senior notes. As calculation agent, MS & Co.
                            will determine the exchange ratio and calculate the
                            number of shares of basket stocks or cash that you
                            receive if you exercise your exchange right or if we
                            call the notes. As calculation agent, MS & Co. will
                            also adjust the exchange ratio for certain corporate
                            events that could affect the price of the basket
                            stocks and that we describe in the section called
                            "Description of Notes--Adjustments to the Exchange
                            Ratios and the Basket" in this pricing supplement.

No Affiliation with         The issuers of the basket stocks are not affiliates
the Issuers of the          of ours and are not involved with this offering in
Basket Stocks               any way. The notes are obligations of Morgan Stanley
                            Dean Witter & Co. and not of the issuers of the
                            basket stocks.

More Information            The notes are senior notes issued as part of our
on the Notes                Series C medium-term note program. You can find a
                            general description of our Series C medium-term note
                            program in the accompanying prospectus supplement
                            dated May 6, 1999. We describe the basic features of
                            this type of note in the sections called
                            "Description of Notes-- Fixed Rate Notes" and
                            "--Exchangeable Notes."

                            Because this is a summary, it does not contain all
                            of the information that may be important to you,
                            including the specific requirements for the exercise
                            of your exchange right and of our call right. You
                            should read the "Description of Notes" section in
                            this pricing supplement for a detailed description
                            of the terms of the notes. You should also read
                            about some of the risks involved in investing in the
                            notes in the section called "Risk Factors." We urge
                            you to consult with your investment, legal,
                            accounting and other advisors with regards to any
                            investment in the notes.

How to reach us             You may contact us at our principal executive
                            offices at 1585 Broadway, New York, New York 10036
                            (telephone number (212) 761-4000).

<PAGE>

                                  RISK FACTORS

      The notes are not secured debt and are riskier than ordinary debt
securities. This section describes the most significant risks relating to the
notes. You should carefully consider whether the notes are suited to your
particular circumstances before you decide to purchase them.


Yield to Maturity Less Than     These notes have a yield to maturity of
Interest on Ordinary Notes      2.00% per year based on the issue price of
                                $887.45 and computed on a semi-annual
                                bond-equivalent basis. This yield to maturity
                                is lower than the rate of interest that we
                                would pay on non-exchangeable senior notes
                                maturing at the same time as the notes. If you
                                exchange your notes for the basket stocks, you
                                will not receive accrued original issue
                                discount.

Notes May Not Be                There may be little or no secondary market for
Actively Traded                 the notes. Although the notes have been
                                approved for listing on the American Stock
                                Exchange, Inc., it is not possible to predict
                                whether the notes will trade in the secondary
                                markets. Even if there is a secondary market,
                                it may not provide enough liquidity to allow
                                you to trade or sell the notes easily. MS & Co.
                                currently intends to act as a market maker for
                                the notes, but is not required to do so.

Market Price of Notes           Several factors, many of which are beyond our
Influenced by Many              control, will influence the value of the notes,
Unpredictable Factors           including:

                                o  the market price of the basket stocks

                                o  the volatility (frequency and magnitude of
                                   changes in price) of each of the basket
                                   stocks

                                o  the dividend rate on the basket stocks

                                o  economic, financial, political and regulatory
                                   or judicial events that affect stock markets
                                   generally and which may affect the market
                                   price of any one of the basket stocks or of
                                   the basket as a whole

                                o  interest and yield rates in the market

                                o  the time remaining until (1) you can exchange
                                   your notes for stock, (2) we can call the
                                   notes and (3) the notes mature

                                o  our creditworthiness

                                These factors will influence the price that you
                                will receive if you sell your notes prior to
                                maturity. For example, you may have to sell your
                                notes at a substantial discount from the issue
                                price if the market prices of the basket stocks
                                are at, below or not sufficiently above the
                                price of the basket stocks at pricing.

                                You cannot predict the future performance of any
                                of the basket stocks or of the basket as a whole
                                based on their historical performance.

No Affiliation with             We are not affiliated with any of the issuers of
the Issuers of the Basket       the basket stocks. We or our affiliates may
Stocks                          presently or from time to time engage in
                                business with one or more of the issuers of the
                                basket stocks, including extending loans to, or
                                making equity investments in, one or more of the
                                issuers of the basket stocks or their affiliates
                                or subsidiaries or providing underwriting or
                                investment advisory services to one or more of
                                the issuers of the basket stocks, including
                                merger and acquisition advisory services. In the
                                course of our business, we or our affiliates may
                                acquire non-public information about one or more
                                of the issuers of the basket stocks. Moreover,
                                we have no ability to control or predict the
                                actions of the issuers of the basket stocks,
                                including any corporate actions of the type that
                                would require the calculation agent to adjust
                                the exchange ratio. We or our affiliates from
                                time to time have published and in the future
                                may publish research reports with respect to the
                                basket stocks. The basket was compiled
                                independently of any research recommendations
                                and may not be consistent with such
                                recommendations. The issuers of the basket
                                stocks are not involved in the offering of the
                                notes in any way and have no obligation to
                                consider your interest as an owner of these
                                notes in taking any corporate actions that might
                                affect the value of your notes. None of the
                                money you pay for the notes will go to the
                                issuers of the basket stocks.

You Have No                     As an owner of notes, you will not have voting
Shareholder Rights              rights or the right to receive dividends or
                                other distributions or any other rights with
                                respect to the basket stocks.

Limited Adjustments             MS & Co., as calculation agent, will adjust any
                                of the exchange ratios for certain events
                                affecting the basket stocks, such as stock
                                splits and stock dividends, and certain other
                                corporate actions involving the issuers of the
                                basket stocks, such as mergers. However, the
                                calculation agent is not required to make an
                                adjustment for every corporate event that can
                                affect the basket stocks. For example, the
                                calculation agent is not required to make any
                                adjustments if the issuers of the basket stocks
                                or anyone else makes a partial tender offer or a
                                partial exchange offer for any basket stock. If
                                an event occurs that does not require the
                                calculation agent to adjust the exchange rate,
                                the market price of the notes may be materially
                                and adversely affected. In addition, the
                                calculation agent may, but is not required to,
                                make adjustments for corporate events that can
                                affect the basket stocks other than those
                                contemplated in this pricing supplement. Such
                                adjustments will be made to reflect the
                                consequences of those corporate events but not
                                with the aim of changing relative investment
                                risk. The determination by the calculation agent
                                to adjust, or not to adjust, the exchange ratios
                                may materially and adversely affect the market
                                price of the notes.

Potential Conflicts of          As calculation agent, MS & Co. will calculate
Interest between You            the basket value, how many shares of the basket
and the Calculation             stocks you will receive in exchange for your
Agent and Other                 notes and what adjustments should be made to the
Affiliates of Ours              exchange ratios to reflect certain corporate and
                                other events. MS & Co. and other affiliates may
                                carry out hedging activities related to the
                                notes or to other instruments, including trading
                                in the basket stocks as well as in other
                                instruments related to the basket stocks. MS &
                                Co. and some of our subsidiaries also trade the
                                basket stocks on a regular basis as part of
                                their general broker-dealer businesses. Any of
                                these activities and MS & Co.'s affiliation with
                                us could influence MS & Co.'s determinations as
                                calculation agent, including with respect to
                                adjustments to the exchange ratios, and,
                                accordingly, the amount of stock or cash that
                                you receive when you exchange the notes or when
                                we call the notes. In addition, such trading
                                activity could potentially affect the price of
                                the basket stocks and, thereby, the value of the
                                basket stocks or cash you will receive upon
                                exchange or redemption.

Tax Treatment                   You should also consider the tax consequences of
                                investing in the notes. If you are a U.S.
                                taxable investor, you will be subject to annual
                                income tax based on the comparable yield of the
                                notes, even though you will not receive any
                                periodic interest payments and at maturity may
                                only receive the return of the principal amount
                                of the notes. In addition, any gain recognized
                                by U.S. taxable investors on the sale, exchange
                                or retirement of the notes will be treated as
                                ordinary income. Please read carefully the
                                section "Description of Notes--United States
                                Federal Taxation" in this pricing supplement and
                                the section "United States Federal
                                Taxation--Notes--Optionally Exchangeable Notes"
                                in the accompanying prospectus supplement.

<PAGE>
                              DESCRIPTION OF NOTES

      Terms not defined herein have the meanings given to such terms in the
accompanying prospectus supplement. The term "Note" refers to each $887.45 issue
price of our Exchangeable Notes due August 17, 2005 (Exchangeable for Shares of
Common Stock of Three Pharmaceutical Corporations). In this pricing supplement,
the terms "MSDW," "we," "us" and "our" refer to Morgan Stanley Dean Witter & Co.

Principal Amount..............   $12,000,000

Maturity Date.................   August 17, 2005

Specified Currency............   U.S. Dollars

Issue Price...................   $887.45 (88.745% of the principal amount at
                                 maturity)

Stated OID....................   2.00% per annum computed on a semi-annual
                                 bond-equivalent basis

Original Issue Date
(Settlement Date).............   August 17, 1999

CUSIP.........................   617446DN6

Minimum Denominations.........   $1,000


Initial Basket Value..........   $766.6955.  Based on the Market Prices (as
                                 defined below) of the Basket Stocks at the
                                 time we priced the notes on August 12, 1999,
                                 the Exchange Ratios have been initially set
                                 so that the Basket Value on such date equals
                                 the Initial Basket Value.

Basket Value..................   The Basket Value, for any date, will equal
                                 the sum of the products of the Market Prices
                                 and the applicable Exchange Ratios for each
                                 Basket Stock, each determined as of such date
                                 by the Calculation Agent.

Basket .......................   The basket is a weighted portfolio of the
                                 three Basket Stocks.  See "Basket Stocks"
                                 below.

Basket Stocks.................   The following table sets forth the Basket
                                 Stocks, the ticker symbol of the Basket
                                 Stocks on the New York Stock Exchange, Inc.,
                                 the percentage of the Initial Basket Value
                                 represented by each Basket Stock, the initial
                                 Market Price of each Basket Stock at the time
                                 we priced the notes on August 12, 1999, the
                                 Exchange Ratio of each Basket Stock and the
                                 initial value of the aggregate shares of each
                                 Basket Stock contained in the Basket at that
                                 time:

<TABLE>
                                          Percent
                                        Represented     Initial
                                         in Initial      Stock     Exchange   Initial
Issuer of Basket Stock        Ticker    Basket Value     Price       Ratio     Value
- ----------------------        ------    ------------    -------    --------   -------
<S>                           <C>       <C>             <C>        <C>        <C>
Bristol-Myers Squibb
   Company
   ("Bristol-Myers")........   BMY         33.333%      $66.3750    3.8503    $255.5637
Merck & Co., Inc.
   ("Merck")................   MRK         33.333%      $61.0000    4.1896    $255.5656
Pfizer Inc. ("Pfizer")......   PFE         33.333%      $33.4375    7.6431    $255.5662
</TABLE>

                                 The Exchange Ratio of each Basket Stock
                                 indicates the number of shares of such Basket
                                 Stock, given the Market Price of such Basket
                                 Stock, required to be included in the
                                 calculation of the Initial Basket Value so
                                 that each Basket Stock represents an
                                 equally-weighted percentage of the Initial
                                 Basket Value.  The respective Exchange Ratios
                                 will remain constant for the term of the
                                 Notes unless adjusted for certain corporate
                                 events.  See "Adjustments to the Exchange
                                 Ratios and the Basket."

Exchange Right................   On any Exchange Date, you will be entitled
                                 upon (i) your completion and delivery to us
                                 and the Calculation Agent of an Official
                                 Notice of Exchange (in the form of Annex A
                                 attached hereto) prior to 11:00 a.m. New York
                                 City time on such date and (ii) delivery on
                                 such date of your Notes to the Trustee, to
                                 exchange each Note for a number of shares of
                                 each Basket Stock equal to the Exchange Ratio
                                 for such Basket Stock, subject to adjustment
                                 as described under "-- Adjustments to the
                                 Exchange Ratios and the Basket" below.  You
                                 will not, however, be entitled to exchange
                                 your Notes if we have previously called the
                                 Notes for the cash Call Price as described
                                 under "--Company Call Right" below.

                                 Upon any such exchange, we may, at our sole
                                 option, either deliver such Basket Stocks or
                                 pay an amount in cash equal to the Basket
                                 Value on the Exchange Date, as determined by
                                 the Calculation Agent, in lieu of such
                                 shares.  Such delivery or payment will be
                                 made 3 business days after any Exchange Date,
                                 subject to delivery of such Notes to the
                                 Trustee on the Exchange Date.

                                 Upon any exercise of the Exchange Right, you
                                 will not be entitled to  any cash payment
                                 representing any accrued Stated OID.  Such
                                 accrued Stated OID will be deemed paid by our
                                 delivery of the Basket Stocks or the
                                 equivalent amount of cash upon exercise of the
                                 Exchange Right.

                                 We will, or will cause the Calculation Agent
                                 to, deliver such Basket Stocks or cash to the
                                 Trustee for delivery to you.

No Fractional Shares .........   If upon any exchange of the Notes we deliver
                                 the Basket Stocks, we will pay cash in lieu
                                 of delivering fractional shares of any Basket
                                 Stock in an amount equal to the corresponding
                                 fractional Market Price of such Basket Stock
                                 as determined by the Calculation Agent on
                                 such Exchange Date.

Exchange Ratio ...............   The Exchange Ratios set forth under "Basket
                                 Stocks" above are subject to adjustment for
                                 certain corporate events.  See "Adjustments
                                 to the Exchange Ratios and Basket" below.

Exchange Date.................   Any Trading Day that falls during the period
                                 beginning November 17, 1999 and ending on the
                                 day prior to the earliest of (i) the Maturity
                                 Date, (ii) the Call Date and (iii) in the
                                 event of a call for the cash Call Price as
                                 described under "--Company Call Right" below,
                                 the Company Notice Date.

Company Call Right ...........   On or after August 17, 2002, we may call the
                                 Notes, in whole but not in part, for
                                 mandatory exchange into the Basket Stocks at
                                 the applicable Exchange Ratios provided that,
                                 if the Basket Value on the Trading Day
                                 immediately preceding the Company Notice
                                 Date, as determined by the Calculation Agent,
                                 is less than the applicable Call Price for
                                 the Call Date specified in our Notice of
                                 mandatory exchange, we will (under those
                                 circumstances only) pay such applicable Call
                                 Price in cash on the Call Date.  If we call
                                 the Notes for mandatory exchange, then,
                                 unless you subsequently exercise the Exchange
                                 Right (the exercise of which will not be
                                 available to you following a call for cash in
                                 an amount equal to the Call Price), the
                                 Basket Stocks or (in the event of a call for
                                 cash, as described above) cash to be
                                 delivered to you will be delivered on the
                                 Call Date fixed by us and set forth in our
                                 notice of mandatory exchange, upon delivery
                                 of your Notes to the Trustee.  We will, or
                                 will cause the Calculation Agent to, deliver
                                 such  Basket Stocks or cash to the Trustee
                                 for delivery to you.

                                 Upon an exchange by us (whether payment is to
                                 be made in Basket Stocks or by payment of the
                                 cash Call Price, as applicable), you will not
                                 receive any additional cash payment
                                 representing any accrued Stated OID.  Such
                                 accrued Stated OID will be deemed paid by the
                                 delivery of Basket Stocks or cash.

                                 On or after the Company Notice Date (other
                                 than with respect to a call of the Notes for
                                 the cash Call Price by us) you will continue
                                 to be entitled to exercise the Exchange Right
                                 and receive any amounts described under
                                 "--Exchange Right" above.

Company Notice Date...........   The scheduled Trading Day on which we issue
                                 our notice of mandatory exchange, which must
                                 be at least 30 but no more than 60 days prior
                                 to the Call Date.

Call Date.....................   The scheduled Trading Day on or after August
                                 17, 2002 specified by us in our notice of
                                 mandatory exchange on which we will deliver
                                 the Basket Stocks or cash to holders of the
                                 Notes for mandatory exchange.

Call Price....................   The table below shows indicative Call Prices
                                 for each $1,000 principal amount of Notes on
                                 August 17, 2002 and at each August 17
                                 thereafter to and including the Maturity
                                 Date.  The Call Price for each $1,000
                                 principal amount of Notes called for mandatory
                                 exchange on Call Dates between such
                                 indicative dates would include an additional
                                 amount reflecting Stated OID accrued from the
                                 next preceding date in the table through the
                                 applicable Call Date at a rate of 2.00% per
                                 annum.  Such additional accreted amount of
                                 Stated OID will be determined by the
                                 Calculation Agent and will be calculated on a
                                 semiannual bond-equivalent basis based on the
                                 Call Price for the immediately preceding Call
                                 Date indicated in the table below.

                                 Call Date                         Call Price
                                 ---------                         ----------
                                 August 17, 2002...............      $942.05
                                 August 17, 2003...............      $960.98
                                 August 17, 2004...............      $980.30
                                 Maturity......................    $1,000.00

Market Price..................   If a Basket Stock (or any other security for
                                 which a Market Price must be determined) is
                                 listed on a national securities exchange, is a
                                 security of the Nasdaq National Market or is
                                 included in the OTC Bulletin Board Service
                                 ("OTC Bulletin Board") operated by the
                                 National Association of Securities Dealers,
                                 Inc. (the "NASD"), the Market Price for one
                                 share of such Basket Stock (or one unit of any
                                 such other security) on any Trading Day means
                                 (i) the last reported sale price, regular
                                 way, on such day on the principal United
                                 States securities exchange registered under
                                 the Securities Exchange Act of 1934, as
                                 modified (the "Exchange Act"), on which such
                                 Basket Stock  (or any such other security) is
                                 listed or admitted to trading or (ii) if not
                                 listed or admitted to trading on any such
                                 securities exchange or if such last reported
                                 sale price is not obtainable (even if such
                                 Basket Stock  (or other such security) is
                                 listed or admitted to trading on such
                                 securities exchange), the last reported sale
                                 price on the over-the-counter market as
                                 reported on the Nasdaq National Market or OTC
                                 Bulletin Board on such day.  If the last
                                 reported sale price is not available pursuant
                                 to clause (i) or (ii) of the preceding
                                 sentence because of a Market Disruption Event
                                 or otherwise, the Market Price for any
                                 Trading Day shall be the mean, as determined
                                 by the Calculation Agent, of the bid prices
                                 for such Basket Stock (or any such other
                                 security) obtained from as many dealers in
                                 such security (which may include MS & Co. or
                                 any of our other subsidiaries or affiliates),
                                 but not exceeding three, as will make such
                                 bid prices available to the Calculation
                                 Agent.  A "security of the Nasdaq National
                                 Market" shall include a security included in
                                 any successor to such system and the term
                                 "OTC Bulletin Board Service" shall include
                                 any successor service thereto.

Trading Day...................   A day, as determined by the Calculation
                                 Agent, on which trading is generally
                                 conducted on the New York Stock Exchange, Inc.
                                 ("NYSE"), the American Stock Exchange, Inc.,
                                 the Nasdaq National Market, the Chicago
                                 Mercantile Exchange, the Chicago Board of
                                 Options Exchange and in the over-the-counter
                                 market for equity securities in the United
                                 States and on which a Market Disruption Event
                                 has not occurred.

Book Entry Note or
Certificated Note.............   Book Entry, DTC

Senior Note or
Subordinated Note.............   Senior

Trustee.......................   The Chase Manhattan Bank

Agent for this Underwritten
Offering of Notes.............   MS & Co.

Calculation Agent.............   MS & Co.

                                 All determinations made by the Calculation
                                 Agent will be at the sole discretion of the
                                 Calculation Agent and will, in the absence of
                                 manifest error, be conclusive for all
                                 purposes and binding on you and on us.

                                 Because the Calculation Agent is our
                                 affiliate, potential conflicts of interest
                                 may exist between the Calculation Agent and
                                 you as an owner of the Notes, including with
                                 respect to certain determinations and
                                 judgments that the Calculation Agent must
                                 make in making adjustments to the Exchange
                                 Ratios or other adjustments or determining
                                 the Market Price or whether a Market
                                 Disruption Event has occurred.  See
                                 "Adjustments to the Exchange Ratios and the
                                 Basket" and "Market Disruption Event" below.
                                 MS & Co. is obligated to carry out its duties
                                 and functions as Calculation Agent in good
                                 faith and using its reasonable judgment.

Adjustments to the Exchange
Ratios and the Basket.........   The Exchange Ratio with respect to any Basket
                                 Stock and the Basket will be adjusted as
                                 follows:

                                 1. If a Basket Stock is subject to a stock
                                 split or reverse stock split, then once such
                                 split has become effective, the Exchange
                                 Ratio of such Basket Stock will be adjusted
                                 to equal the product of the prior Exchange
                                 Ratio and the number of shares issued in such
                                 stock split or reverse stock split with
                                 respect to one share of such Basket Stock.

                                 2. If a Basket Stock is subject (i) to a stock
                                 dividend (issuance of additional shares of such
                                 Basket Stock) that is given ratably to all
                                 holders of shares of such Basket Stock or (ii)
                                 to a distribution of such Basket Stock as a
                                 result of the triggering of any provision of
                                 the corporate charter of the issuer of the
                                 Basket Stock, then once the dividend has become
                                 effective and such Basket Stock is trading ex-
                                 dividend, the Exchange Ratio of such Basket
                                 Stock will be adjusted so that the new Exchange
                                 Ratio shall equal the prior Exchange Ratio plus
                                 the product of (i) the number of shares issued
                                 with respect to one share of such Basket Stock
                                 and (ii) the prior Exchange Ratio of such
                                 Basket Stock.

                                 3. There will be no adjustments to any Exchange
                                 Ratio to reflect cash dividends or other
                                 distributions paid with respect to a Basket
                                 Stock other than distributions described in
                                 paragraph 6 below and Extraordinary Dividends
                                 as described below. A cash dividend or other
                                 distribution with respect to a Basket Stock
                                 will be deemed to be an "Extraordinary
                                 Dividend" if such dividend or other
                                 distribution exceeds the immediately preceding
                                 non-Extraordinary Dividend for such Basket
                                 Stock (as adjusted for any subsequent corporate
                                 event requiring an adjustment hereunder, such
                                 as a stock split or reverse stock split) by an
                                 amount equal to at least 10% of the Market
                                 Price of such Basket Stock on the Trading Day
                                 preceding the ex-dividend date for the payment
                                 of such Extraordinary Dividend (the "ex-
                                 dividend date"). If an Extraordinary Dividend
                                 occurs with respect to a Basket Stock, the
                                 Exchange Ratio with respect to such Basket
                                 Stock will be adjusted on the ex-dividend date
                                 with respect to such Extraordinary Dividend so
                                 that the new Exchange Ratio will equal the
                                 product of (i) the then current Exchange Ratio
                                 and (ii) a fraction, the numerator of which is
                                 the Market Price on the Trading Day preceding
                                 the ex-dividend date, and the denominator of
                                 which is the amount by which the Market Price
                                 on the Trading Day preceding the ex-dividend
                                 date exceeds the Extraordinary Dividend Amount.
                                 The "Extraordinary Dividend Amount" with
                                 respect to an Extraordinary Dividend for a
                                 Basket Stock will equal (i) in the case of cash
                                 dividends or other distributions that
                                 constitute quarterly dividends, the amount per
                                 share of such Extraordinary Dividend minus the
                                 amount per share of the immediately preceding
                                 non-Extraordinary Dividend for such Basket
                                 Stock or (ii) in the case of cash dividends or
                                 other distributions that do not constitute
                                 quarterly dividends, the amount per share of
                                 such Extraordinary Dividend. To the extent an
                                 Extraordinary Dividend is not paid in cash, the
                                 value of the non-cash component will be
                                 determined by the Calculation Agent, whose
                                 determination shall be conclusive. A
                                 distribution on a Basket Stock described in
                                 paragraph 6 below that also constitutes an
                                 Extraordinary Dividend shall only cause an
                                 adjustment to the Exchange Ratio for such
                                 Basket Stock pursuant to paragraph 6.

                                 4. If the issuer of a Basket Stock is being
                                 liquidated or is subject to a proceeding under
                                 any applicable bankruptcy, insolvency or other
                                 similar law, the Notes will continue to be
                                 exchangeable into such Basket Stock so long as
                                 a Market Price for such Basket Stock is
                                 available. If a Market Price is no longer
                                 available for such Basket Stock for whatever
                                 reason, including the liquidation of the issuer
                                 of such Basket Stock or the subjection of the
                                 issuer of such Basket Stock to a proceeding
                                 under any applicable bankruptcy, insolvency or
                                 other similar law, then the value of such
                                 Basket Stock will equal zero for so long as no
                                 Market Price is available.

                                 5. If there occurs any reclassification or
                                 change of a Basket Stock, including, without
                                 limitation, as a result of the issuance of
                                 tracking stock by the issuer of such Basket
                                 Stock, or if the issuer of such Basket Stock
                                 has been subject to a merger, combination or
                                 consolidation and is not the surviving entity,
                                 or if there occurs a sale or conveyance to
                                 another corporation of the property and assets
                                 of the issuer of such Basket Stock as an
                                 entirety or substantially as an entirety, in
                                 each case as a result of which the holders of
                                 such Basket Stock shall be entitled to receive
                                 stock, other securities or other property or
                                 assets (including, without limitation, cash or
                                 other classes of stock of the issuer of such
                                 Basket Stock) ("Exchange Property") with
                                 respect to or in exchange for such Basket
                                 Stock, then, with respect to such Basket Stock,
                                 the holders of the Notes then outstanding will
                                 be entitled thereafter to exchange such Notes
                                 into the kind and amount of Exchange Property
                                 that they would have owned or been entitled to
                                 receive upon such reclassification, change,
                                 merger, combination, consolidation, sale or
                                 conveyance had such holders exchanged such
                                 Notes at the then current Exchange Ratio for
                                 such Basket Stock immediately prior to any such
                                 corporate event, but without interest thereon.

                                 6. If the issuer of a Basket Stock issues to
                                 all of its shareholders equity securities of an
                                 issuer other than the issuer of such Basket
                                 Stock (other than in a transaction described in
                                 paragraph 5 above), then the holders of the
                                 Notes then outstanding will be entitled to
                                 receive such new equity securities upon
                                 exchange of such Notes. The Exchange Ratio for
                                 such new equity securities will equal the
                                 product of the Exchange Ratio in effect for
                                 such Basket Stock at the time of the issuance
                                 of such new equity securities times the number
                                 of shares of the new equity securities issued
                                 with respect to one share of such Basket Stock.

                                 7. No adjustments to any Exchange Ratio will be
                                 required other than those specified above.
                                 However, we may, at our sole discretion, cause
                                 the Calculation Agent to make additional
                                 changes to any Exchange Ratio upon the
                                 occurrence of corporate or other similar events
                                 that affect or could potentially affect market
                                 prices of, or shareholders' rights in, a Basket
                                 Stock (or other Exchange Property) but only to
                                 reflect such changes, and not with the aim of
                                 changing relative investment risk.

                                 No adjustments to any Exchange Ratio will be
                                 required unless such adjustment would require a
                                 change of at least 0.1% in the Exchange Ratio
                                 then in effect. The Exchange Ratio resulting
                                 from any of the adjustments specified above
                                 will be rounded to the nearest one
                                 hundred-thousandth with five one-millionths
                                 being rounded upward.

                                 The Exchange Ratios will not be adjusted to
                                 take into account the accrual of Stated OID.

                                 The Calculation Agent shall be solely
                                 responsible for the determination and
                                 calculation of any adjustments to the Exchange
                                 Ratios and of any related determinations and
                                 calculations with respect to any
                                 distributions of stock, other securities or
                                 other property or assets (including cash) in
                                 connection with any corporate event described
                                 in paragraph 5 or 6 above, and its
                                 determinations and calculations with respect
                                 thereto shall be conclusive.

                                 The Calculation Agent will provide information
                                 as to any adjustments to any Exchange Ratio
                                 upon written request by any holder of the
                                 Notes.

Market Disruption Event.......   "Market Disruption Event" means, with respect
                                 to any Basket Stock, the occurrence or
                                 existence of any of the following events as
                                 determined by the Calculation Agent:

                                    (i) a suspension, absence or material
                                    limitation of trading of such Basket Stock
                                    on the primary market for such Basket Stock
                                    for more than two hours of trading or
                                    during the one-half hour period preceding
                                    the close of trading in such market; or a
                                    breakdown or failure in the price and
                                    trade reporting systems of the primary
                                    market for such Basket Stock as a result
                                    of which the reported trading prices for
                                    such Basket Stock during the last one-half
                                    hour preceding the closing of trading in
                                    such market are materially inaccurate; or
                                    the suspension, absence or material
                                    limitation on the primary market for
                                    trading in options contracts related to
                                    such Basket Stock, if available, during
                                    the one-half hour period preceding the
                                    close of trading in the applicable market;
                                    and

                                    (ii) a determination by the Calculation
                                    Agent in its sole discretion that any
                                    event described in clause (i) above
                                    materially interfered with the ability of
                                    MSDW or any of its affiliates to unwind
                                    all or a material portion of the hedge
                                    with respect to the Notes.

                                 For purposes of determining whether a Market
                                 Disruption Event has occurred: (1) a limitation
                                 on the hours or number of days of trading will
                                 not constitute a Market Disruption Event if it
                                 results from an announced change in the regular
                                 business hours of the relevant exchange, (2) a
                                 decision to permanently discontinue trading in
                                 the relevant option contract will not
                                 constitute a Market Disruption Event, (3)
                                 limitations pursuant to NYSE Rule 80A (or any
                                 applicable rule or regulation enacted or
                                 promulgated by the NYSE, any other
                                 self-regulatory organization or the Securities
                                 and Exchange Commission of similar scope as
                                 determined by the Calculation Agent) on trading
                                 during significant market fluctuations shall
                                 constitute a suspension, absence or material
                                 limitation of trading, (4) a suspension of
                                 trading in an options contract on any Basket
                                 Stock by the primary securities market trading
                                 in such options, if available, by reason of (x)
                                 a price change exceeding limits set by such
                                 securities exchange or market, (y) an imbalance
                                 of orders relating to such contracts or (z) a
                                 disparity in bid and ask quotes relating to
                                 such contracts will constitute a suspension,
                                 absence or material limitation of trading in
                                 options contracts related to such Basket Stock
                                 and (5) a suspension, absence or material
                                 limitation of trading on the primary securities
                                 market on which options contracts related to
                                 any Basket Stock are traded will not include
                                 any time when such securities market is itself
                                 closed for trading under ordinary
                                 circumstances.

Alternate Exchange
Calculation in case of
an Event of Default...........   In case an Event of Default with respect to
                                 the Notes shall have occurred and be
                                 continuing, the amount declared due and
                                 payable upon any acceleration of any Note
                                 shall be determined by MS & Co., as
                                 Calculation Agent, and shall be equal to the
                                 Issue Price of a Note plus the accrued Stated
                                 OID to but not including the date of
                                 acceleration; provided that if (x) the holder
                                 of a Note has submitted an Official Notice of
                                 Exchange to us in accordance with the
                                 Exchange Right or (y) we have called the
                                 Notes, other than a call for the cash Call
                                 Price, in accordance with the Company Call
                                 Right, the amount declared due and payable
                                 upon any such acceleration shall be an amount
                                 in cash for each $1,000 principal amount of a
                                 Note equal to the Basket Value, determined by
                                 the Calculation Agent as of the Exchange Date
                                 or as of the date of acceleration,
                                 respectively, and shall not include any
                                 accrued Stated OID thereon; provided further
                                 that if we have called the Notes for cash in
                                 an amount equal to the Call Price, in
                                 accordance with the Company Call Right, the
                                 amount declared due and payable upon any such
                                 acceleration shall be an amount in cash for
                                 each $1,000 principal amount of a Note equal
                                 to the applicable Call Price.  See "--Call
                                 Price" above.

Basket Stocks;
Public Information............   Each of the three issuers of Basket Stocks is
                                 registered under the Exchange Act.  Companies
                                 with securities registered under the Exchange
                                 Act are required to file periodically certain
                                 financial and other information specified by
                                 the Securities and Exchange Commission (the
                                 "Commission").  Information provided to or
                                 filed with the Commission can be inspected
                                 and copied at the public reference facilities
                                 maintained by the Commission at Room 1024,
                                 450 Fifth Street, N.W., Washington, D.C.
                                 20549 or at its Regional Offices located at
                                 Suite 1400, Citicorp Center, 500 West Madison
                                 Street, Chicago, Illinois 60661 and at Seven
                                 World Trade Center, 13th Floor, New York, New
                                 York 10048, and copies of such material can
                                 be obtained from the Public Reference Section
                                 of the Commission, 450 Fifth Street, N.W.,
                                 Washington, D.C. 20549, at prescribed rates.
                                 In addition, information provided to or filed
                                 with the Commission electronically can be
                                 accessed through a website maintained by the
                                 Commission.  The address of the Commission's
                                 website is http://www.sec.gov.    Information
                                 provided to or filed with the Commission by
                                 each of the issuers pursuant to the Exchange
                                 Act can be located by reference to its
                                 respective Commission file number.  In
                                 addition, information regarding the issuers
                                 of the Basket Stocks may be obtained from
                                 other sources including, but not limited to,
                                 press releases, newspaper articles and other
                                 publicly disseminated documents.  We make no
                                 representation or warranty as to the accuracy
                                 or completeness of such information.

                                 Bristol-Myers Squibb Company is a producer and
                                 distributor of pharmaceuticals, consumer
                                 medicines, nutritionals, medical devices and
                                 beauty care products, and its Commission file
                                 number is 1-01136.

                                 Merck & Co., Inc. is a global pharmaceutical
                                 company that discovers, develops, manufactures
                                 and markets a broad range of human and animal
                                 health products and provides pharmaceutical
                                 benefit services, and its Commission file
                                 number is 1-03305.

                                 Pfizer Inc. is a global pharmaceutical company
                                 that discovers, develops, manufactures and
                                 markets medicines for humans and animals, and
                                 its Commission file number is 1-03619.

                                 This pricing supplement relates only to the
                                 Notes offered hereby and does not relate to the
                                 Basket Stocks or other securities of the
                                 issuers of the Basket Stocks. We have derived
                                 all disclosures contained in this pricing
                                 supplement regarding the issuers of the Basket
                                 Stocks from the publicly available documents
                                 described above. Neither we nor the Agent has
                                 participated in the preparation of such
                                 documents or made any due diligence inquiry
                                 with respect to the issuers of the Basket
                                 Stocks in connection with the offering of the
                                 Notes. Neither we nor the Agent makes any
                                 representation that such publicly available
                                 documents are or any other publicly available
                                 information regarding the issuers of the Basket
                                 Stocks is accurate or complete. Furthermore, we
                                 cannot give any assurance that all events
                                 occurring prior to the date hereof (including
                                 events that would affect the accuracy or
                                 completeness of the publicly available
                                 documents described above) that would affect
                                 the trading price of the Basket Stocks (and
                                 therefore the Exchange Ratios) have been
                                 publicly disclosed. Subsequent disclosure of
                                 any such events or the disclosure of or failure
                                 to disclose material future events concerning
                                 the issuers of the Basket Stocks could affect
                                 the value received on any Exchange Date or Call
                                 Date with respect to the Notes and therefore
                                 the trading prices of the Notes.

                                 Neither we nor any of our affiliates makes any
                                 representation to you as to the performance of
                                 any of the the Basket Stocks or the Basket as a
                                 whole.

                                 We or our affiliates may presently or from time
                                 to time engage in business with the issuers of
                                 the Basket Stocks, including extending loans
                                 to, or making equity investments in, the
                                 issuers of the Basket Stocks or providing
                                 advisory services to the issuers of the Basket
                                 Stocks, including merger and acquisition
                                 advisory services. In the course of such
                                 business, we or our affiliates may acquire
                                 non-public information with respect to the
                                 issuers of the Basket Stocks. The statement in
                                 the preceding sentence is not intended to
                                 affect the rights of the holders of the Notes
                                 under the securities laws. In addition, one or
                                 more of our affiliates may publish research
                                 reports with respect to the issuers of the
                                 Basket Stocks. The Basket was compiled
                                 independently of any research recommendations
                                 and may not be consistent with such
                                 recommendations. As a prospective purchaser of
                                 a Note, you should undertake such independent
                                 investigation of the issuers of the Basket
                                 Stocks as in your judgment is appropriate to
                                 make an informed decision with respect to an
                                 investment in the Basket Stocks.

Historical Information........   The following table sets forth the published
                                 high and low Market Price during 1996, 1997,
                                 1998 and during 1999 through August 12,
                                 1999.  The Market Price of each Basket Stock
                                 when we priced the notes on August 12, 1999
                                 is set forth in the table under "Basket
                                 Stocks" above.  We obtained the Market Prices
                                 listed below from Bloomberg Financial Markets
                                 and we believe such information to be
                                 accurate.  You should not take the historical
                                 prices of the Basket Stocks as an indication
                                 of future performance.  We cannot give any
                                 assurance that the price of the Basket Stocks
                                 as a whole or any one or more of the Basket
                                 Stocks will increase sufficiently to cause the
                                 beneficial owners of the Notes to receive an
                                 amount in excess of the Issue Price on any
                                 Exchange Date or Call Date.

                                                                      Dividends
                       Bristol-Myers          High          Low       per Share
                       -------------          ----          ---       ---------
                (CUSIP 110122108)
                1996
                First Quarter...............  22 7/16     20 7/16      $0.1875
                Second Quarter..............  22 1/2      19 15/16      0.1875
                Third Quarter...............  24 11/32    21 11/32      0.1875
                Fourth Quarter..............  28 15/16    24 3/8        0.1875
                1997
                First Quarter...............  34 1/2      26 25/32      0.19
                Second Quarter..............  42 5/16     29 1/8        0.19
                Third Quarter...............  43 19/32    36 1/4        0.19
                Fourth Quarter..............  48 29/32    40 27/32      0.19
                1998
                First Quarter...............  54 1/4      44 29/32      0.195
                Second Quarter..............  59 7/32     49 19/32      0.195
                Third Quarter...............  62 29/32    48 15/16      0.195
                Fourth Quarter..............  66 29/32    46 1/8        0.195
                1999
                First Quarter...............  66 3/16     58 7/8        0.215
                Second Quarter..............  70 7/16     57 7/16       0.215
                Third Quarter
                  (through August 12, 1999).  75 7/16     64 5/8        0.215



                                Historical prices have been adjusted for two
                                separate 2-for-1 stock splits of the common
                                stock of Bristol-Myers Squibb Company, which
                                became effective in the first quarter of 1997
                                and the first quarter of 1999, respectively.


                                                                      Dividends
                           Merck              High          Low       per Share
                           ------             ----          ---       ---------
                (CUSIP 589331107)
                1996
                First Quarter...............  35 3/8      30 11/16     $0.17
                Second Quarter..............  33 1/16     28 1/2        0.17
                Third Quarter...............  35 3/8      30 9/16       0.17
                Fourth Quarter..............  42 1/8      34 13/16      0.20
                1997
                First Quarter...............  49 7/8      39 7/8        0.20
                Second Quarter..............  51 3/4      40 3/4        0.21
                Third Quarter...............  53 15/32    45 13/32      0.21
                Fourth Quarter..............  53 21/32    42 1/2        0.225
                1998
                First Quarter...............  66 3/16     51 9/16       0.225
                Second Quarter..............  66 7/8      56 9/32       0.225
                Third Quarter...............  69 5/16     57 31/32      0.225
                Fourth Quarter..............  79 13/32    62 15/32      0.27
                1999
                First Quarter...............  86 3/8      68 1/2        0.27
                Second Quarter..............  85 1/16     66            0.27
                Third Quarter
                  (through August 12, 1999).  75 1/2      60 15/16      0.27


                                Historical prices have been adjusted for a
                                2-for-1 stock split of the common stock of
                                Merck & Co., Inc., which became effective in
                                the first quarter of 1999.



                                                                      Dividends
                           Pfizer             High          Low       per Share
                           ------             ----          ---       ---------
                (CUSIP 717081103)
                1996
                First Quarter...............  11 45/64    10 1/8       $0.05
                Second Quarter..............  12 5/8      10 49/64      0.05
                Third Quarter...............  13 3/16     11 5/8        0.05
                Fourth Quarter..............  15 5/64     13 9/64       0.05
                1997
                First Quarter...............  16 7/16     13 5/8        0.0567
                Second Quarter..............  20 21/64    13 57/64      0.0567
                Third Quarter...............  21 1/4      17 29/64      0.0567
                Fourth Quarter..............  25 15/16    20 1/16       0.0567
                1998
                First Quarter...............  33 15/64    24 41/64      0.0633
                Second Quarter..............  39 13/64    32 1/2        0.0633
                Third Quarter...............  39 9/16     31            0.0633
                Fourth Quarter..............  41 63/64    29 51/64      0.0633
                1999
                First Quarter...............  47 43/64    37 51/64      0.0733
                Second Quarter..............  50          31 45/64      0.0733
                Third Quarter
                  (through August 12, 1999).  38 5/8      32 5/8        0.08


                                 Historical prices have been adjusted for a
                                 2-for-1 stock split of the common stock of
                                 Pfizer Inc., which became effective in the
                                 second quarter of 1997 and a 3-for-1 stock
                                 split of the common stock of Pfizer Inc.
                                 which became effective in the second quarter
                                 of 1999.

                                 We make no representation as to the amount of
                                 dividends, if any, that the issuers of the
                                 Basket Stocks will pay in the future.  In any
                                 event, as an owner of a Note, you will not be
                                 entitled to receive dividends, if any, that
                                 may be payable on the Basket Stocks.

Use of Proceeds and Hedging...   The net proceeds we receive from the sale of
                                 the Notes will be used for general corporate
                                 purposes and, in part, by us or one or more
                                 of our affiliates in connection with hedging
                                 our obligations under the Notes.  See also
                                 "Use of Proceeds" in the accompanying
                                 prospectus.

                                 On or prior to the date of this pricing
                                 supplement, we, through our subsidiaries and
                                 others, hedged our anticipated exposure in
                                 connection with the Notes by taking positions
                                 in the Basket Stocks and positions in other
                                 instruments in connection with such hedging.
                                 Such hedging was carried out in a manner
                                 designed to minimize any impact on the price
                                 of the Basket Stocks.  Our purchase activity
                                 could potentially have increased the price of
                                 the Basket Stocks, and therefore effectively
                                 have increased the level to which the Basket
                                 Stocks must rise before you would receive an
                                 amount of the Basket Stocks worth as much or
                                 more than the accreted principal amount of
                                 your Notes on any Exchange Date or Call Date.
                                 Through our subsidiaries, we are likely to
                                 modify our hedge position throughout the life
                                 of the Notes by purchasing and selling the
                                 Basket Stocks, options contracts on the
                                 Basket Stocks listed on major securities
                                 markets or positions in other securities or
                                 instruments that we may wish to use in
                                 connection with such hedging.  Although we
                                 have no reason to believe that our hedging
                                 activity or other trading activities that we
                                 have, or any of our affiliates has, engaged
                                 in or may engage in has had or will have a
                                 material impact on the price of the Basket
                                 Stocks we cannot give any assurance that we
                                 have not or will not affect such prices as a
                                 result of our hedging or trading activities.

Supplemental Information
Concerning Plan of
Distribution..................   In order to facilitate the offering of the
                                 Notes, the Agent may engage in transactions
                                 that stabilize, maintain or otherwise affect
                                 the price of the Notes or the Basket Stocks.
                                 Specifically, the Agent may overallot in
                                 connection with the offering, creating a short
                                 position in the Notes for its own account. In
                                 addition, to cover allotments or to stabilize
                                 the price of the Notes, the Agent may bid for,
                                 and purchase, the Notes or the Basket Stocks in
                                 the open market. See "Use of Proceeds and
                                 Hedging" above.

                                 We have agreed to indemnify the Agent against
                                 certain liabilities under the Securities Act of
                                 1933, as amended.

ERISA Matters for Pension
Plans And Insurance
Companies.....................   We and certain of our affiliates, including
                                 MS & Co. and Dean Witter Reynolds Inc.
                                 ("DWR"), may each be considered a "party in
                                 interest" within the meaning of the Employee
                                 Retirement Income Security Act of 1974, as
                                 amended ("ERISA"), or a "disqualified person"
                                 within the meaning of the Internal Revenue
                                 Code of 1986, as amended (the "Code") with
                                 respect to many employee benefit plans.
                                 Prohibited transactions within the meaning of
                                 ERISA or the Code may arise, for example, if
                                 the Notes are acquired by or with the assets
                                 of a pension or other employee benefit plan
                                 with respect to which MS & Co., DWR or any of
                                 their affiliates is a service provider,
                                 unless the Notes are acquired pursuant to an
                                 exemption from the prohibited transaction
                                 rules.

                                 The acquisition of the Notes may be eligible
                                 for one of the exemptions noted below if such
                                 acquisition:

                                 (a) (i) is made solely with the assets of a
                                 bank collective investment fund and (ii)
                                 satisfies the requirements and conditions of
                                 Prohibited Transaction Class Exemption
                                 ("PTCE") 91-38 issued by the Department of
                                 Labor ("DOL");

                                 (b) (i) is made solely with assets of an
                                 insurance company pooled separate account and
                                 (ii) satisfies the requirements and
                                 conditions of PTCE 90-1 issued by the DOL;

                                 (c) (i) is made solely with assets managed by
                                 a qualified professional asset manager and
                                 (ii) satisfies the requirements and
                                 conditions of PTCE 84-14 issued by the DOL;

                                 (d) is made solely with assets of a
                                 governmental plan (as defined in Section
                                 3(32) of ERISA) which is not subject to the
                                 provisions of Section 401 of the Code;

                                 (e) (i) is made solely with assets of an
                                 insurance company general account and (ii)
                                 satisfies the requirements and conditions of
                                 PTCE 95-60 issued by the DOL; or

                                 (f) (i) is made solely with assets managed by
                                 an in-house asset manager and (ii) satisfies
                                 the requirements and conditions of PTCE 96-23
                                 issued by the DOL.

                                 Under ERISA, assets of a pension or other
                                 employee benefit plan may include assets held
                                 in the general account of an insurance company
                                 which has issued an insurance policy to such
                                 plan or assets of an entity in which the plan
                                 has invested.  In addition to considering the
                                 consequences of holding the Notes, employee
                                 benefit plans subject to ERISA (or insurance
                                 companies deemed to be investing ERISA plan
                                 assets) purchasing the Notes should consider
                                 the possible implications of owning the
                                 Basket Stocks.  Thus, any insurance company,
                                 pension or employee benefit plan or entity
                                 holding assets of such a plan proposing to
                                 invest in the Notes should consult with its
                                 legal counsel prior to such investment.

United States Federal
Taxation......................   The Notes are Optionally Exchangeable Notes
                                 and investors should refer to the discussion
                                 under "United States Federal
                                 Taxation--Notes--Optionally Exchangeable
                                 Notes" in the accompanying prospectus
                                 supplement.  In connection with the
                                 discussion thereunder, we have determined
                                 that the "comparable yield" is an annual rate
                                 of 7.22%, compounded semi-annually.  Based on
                                 our determination of the comparable yield,
                                 the "projected payment schedule" for a Note
                                 (assuming a par amount of $1,000 or with
                                 respect to each integral multiple thereof)
                                 consists of a projected amount due at
                                 maturity, equal to $1,358.20.

                                 The comparable yield and the projected
                                 payment schedule are not provided for any
                                 purpose other than the determination of United
                                 States Holders' interest accruals and
                                 adjustments in respect of the Notes, and we
                                 make no representation regarding the actual
                                 amounts of the payments on a Note.

<PAGE>


                                                                         ANNEX A

                           OFFICIAL NOTICE OF EXCHANGE

                                         Dated:  [On or after November 17, 1999]


Morgan Stanley Dean Witter & Co.
1585 Broadway
New York, New York 10036

Morgan Stanley & Co. Incorporated, as
  Calculation Agent
1585 Broadway
New York, New York 10036
Fax No.: (212) 761-0674
(Attn: Lily Lam)

Dear Sirs:

      The undersigned holder of the Medium Term Notes, Series C, Senior Fixed
Rate Notes, Exchangeable Notes due August 17, 2005 (Exchangeable for Shares of
Common Stock of Three Pharmaceutical Corporations (the "Basket Stocks")) of
Morgan Stanley Dean Witter & Co. (CUSIP No. 617446DN6) (the "Notes") hereby
irrevocably elects to exercise with respect to the principal amount of the Notes
indicated below, as of the date hereof (or, if this letter is received after
11:00 a.m. on any Trading Day, as of the next Trading Day), provided that such
day is prior to the earliest of (i) August 17, 2005, (ii) the Call Date and
(iii) in the event of a call for cash, the Company Notice Date, the Exchange
Right as described in Pricing Supplement No. 23 dated August 12, 1999 (the
"Pricing Supplement") to the Prospectus Supplement dated May 6, 1999 and the
Prospectus dated May 5, 1999 related to Registration Statement No. 333-75289.
Terms not defined herein have the meanings given to such terms in the Pricing
Supplement. Please date and acknowledge receipt of this notice in the place
provided below on the date of receipt, and fax a copy to the fax number
indicated, whereupon Morgan Stanley Dean Witter & Co. will deliver, at its sole
option, shares of the Basket Stocks or cash 3 business days after the Exchange
Date in accordance with the terms of the Notes, as described in the Pricing
Supplement.

                                      Very truly yours,


                                      ------------------------------------------
                                      [Name of Holder]


                                      By:
                                         --------------------------------------
                                         [Title]


                                      ------------------------------------------
                                      [Fax No.]

                                      $
                                       ----------------------------------------
                                       Principal Amount of Notes
                                       surrendered for exchange


Receipt of the above Official
Notice of Exchange is hereby acknowledged

MORGAN STANLEY DEAN WITTER & CO., as Issuer

MORGAN STANLEY & CO. INCORPORATED, as Calculation Agent

By MORGAN STANLEY & CO. INCORPORATED, as Calculation Agent


By:
    --------------------------------
    Title:

Date and time of acknowledgment
                                ----------



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