DEFINED ASSET FUNDS GOVERNMENT SECURITIES INC FD GNMA SER 1K
485BPOS, 1999-12-01
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    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON DECEMBER 1, 1999

                                                       REGISTRATION NO. 33-21457
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- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549
                     -------------------------------------

                        POST-EFFECTIVE AMENDMENT NO. 11
                                       TO
                                    FORM S-6

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

                   FOR REGISTRATION UNDER THE SECURITIES ACT
                    OF 1933 OF SECURITIES OF UNIT INVESTMENT
                        TRUSTS REGISTERED ON FORM N-8B-2

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

A. EXACT NAME OF TRUST:

                             DEFINED ASSET FUNDS--
                       GOVERNMENT SECURITIES INCOME FUND
                                GNMA SERIES--1K
                           (A UNIT INVESTMENT TRUST)

B. NAMES OF DEPOSITORS:

               MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
                           SALOMON SMITH BARNEY INC.
                       PRUDENTIAL SECURITIES INCORPORATED
                            PAINEWEBBER INCORPORATED

C. COMPLETE ADDRESSES OF DEPOSITORS" PRINCIPAL EXECUTIVE OFFICES:

<TABLE>
    <S>                          <C>                          <C>
     MERRILL LYNCH, PIERCE,
         FENNER & SMITH
          INCORPORATED
     UNIT INVESTMENT TRUSTS
      POST OFFICE BOX 9051
    PRINCETON, NJ 08543-9051                                  SALOMON SMITH BARNEY INC.
                                                               TWO WORLD TRADE CENTER
                                                                     101ST FLOOR
                                                                 NEW YORK, NY 10048
</TABLE>

<TABLE>
    <S>                             <C>                            <C>
      PRUDENTIAL SECURITIES
          INCORPORATED
       ONE NEW YORK PLAZA
       NEW YORK, NY 10292                                          PAINEWEBBER INCORPORATED
                                                                      1285 AVENUE OF THE
                                                                           AMERICAS
                                                                      NEW YORK, NY 10019
</TABLE>

D. NAMES AND COMPLETE ADDRESSES OF AGENTS FOR SERVICE:

<TABLE>
<S>                        <C>                        <C>
  TERESA KONCICK, ESQ.
      P.O. BOX 9051
PRINCETON, NJ 08543-9051                                  MICHAEL KOCHMANN
                                                          388 GREENWICH ST.
                                                         NEW YORK, NY 10013

   LEE B. SPENCER, JR.            COPIES TO:              ROBERT E. HOLLEY
   ONE NEW YORK PLAZA       PIERRE DE SAINT PHALLE,       1200 HARBOR BLVD.
   NEW YORK, NY 10292                ESQ.                WEEHAWKEN, NJ 07087
                             450 LEXINGTON AVENUE
                              NEW YORK, NY 10017
</TABLE>

The issuer has registered an indefinite number of Units under the Securities Act
of 1933 pursuant to Rule 24f-2 and will file the Rule 24f-2 Notice for the most
recent fiscal year on March 11, 1999.

Check box if it is proposed that this Registration Statement shall become
effective on December 10, 1999 pursuant to paragraph (b) of Rule 485.  /X/

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

<TABLE>
<S>                                    <C>
                                       GOVERNMENT SECURITIES INCOME FUND
                                       GNMA SERIES--1K
                                       (A UNIT INVESTMENT TRUST)
                                       -  PORTFOLIO OF MORTGAGE BACKED SECURITIES
                                       -  MONTHLY INCOME DISTRIBUTIONS
                                       -  U.S. TAX EXEMPT FOR MANY FOREIGN HOLDERS
                                       -  CHECK-WRITING
</TABLE>


Sponsors:
Merrill Lynch,
Pierce, Fenner & Smith Incorporated
Salomon Smith Barney Inc.
PaineWebber Incorporated
Prudential Securities Incorporated

- --------------------------
The Securities and Exchange Commission has not approved or disapproved
these Securities or passed upon the adequacy of this prospectus. Any
representation to the contrary is a criminal offense.

Prospectus dated December 10, 1999.

<PAGE>

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

Def ined Asset FundsSM
Defined Asset FundsSM is America's oldest and largest family of unit investment
trusts, with over $160 billion sponsored over the last 28 years. Defined Asset
Funds has been a leader in unit investment trust research and product
innovation. Our family of Funds helps investors work toward their financial
goals with a full range of quality investments, including municipal, corporate
and government bond portfolios, as well as domestic and international equity
portfolios.

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

THE FINANCIAL INFORMATION IN THIS PROSPECTUS IS AS OF THE EVALUATION DATE,
SEPTEMBER 30, 1999.

<TABLE>
<S>                                    <C>
CONTENTS
                                       PAGE
                                       ---
Risk/Return Summary..................    3
What You Can Expect From Your
  Investment.........................    5
  Monthly Income.....................    5
  Return Figures.....................    5
  Records and Reports................    5
The Risks You Face...................    6
  Interest Rate Risk.................    6
  Prepayment Risk....................    6
  Reduced Diversification Risk.......    6
  Litigation Risk....................    6
Selling or Exchanging Units..........    6
  Sponsors" Secondary Market.........    6
  Selling Units to the Trustee.......    6
  Exchange Option....................    7
How The Fund Works...................    7
  Pricing............................    7
  Evaluations........................    7
  Income.............................    8
  Expenses...........................    8
  Portfolio Changes..................    8
  Fund Termination...................    9
  Certificates.......................    9
  Trust Indenture....................    9
  Legal Opinion......................   10
  Auditors...........................   10
  Sponsors...........................   10
  Trustee............................   10
  Underwriters" and Sponsors"
    Profits..........................   10
  Public Distribution................   11
  Code of Ethics.....................   11
  Year 2000 Issues...................   11
Taxes................................   11
Supplemental Information.............   12
Financial Statements.................  D-1
</TABLE>

                                       2
<PAGE>
- --------------------------------------------------------------------------------

RISK/RETURN SUMMARY

<TABLE>
<C>  <S>
 1.  WHAT IS THE FUND'S OBJECTIVE?
     The Fund seeks safety of capital and
     current monthly income, by investing in
     a portfolio of GNMA securities backed by
     the full faith and credit of the United
     States.

 2.  WHAT ARE GINNIE MAES?
     Ginnie Maes are issued by the Government
     National Mortgage Association (GNMA),
     which is a U.S. government corporation.
     Ginnie Maes represent underlying
     mortgages on one- to four-family houses.
     GNMA guarantees the timely monthly
     payment of principal and interest on the
     mortgages.

 3.  WHAT IS THE FUND'S INVESTMENT STRATEGY?

  -  The Fund plans to hold two issues of
     Ginnie Maes with a current aggregate
     face amount of $2,775,999. The Fund is a
     unit investment trust which means that,
     unlike a mutual fund, the Fund's
     portfolio is not managed.

  -  Ginnie Maes are not rated but their
     credit quality is comparable to
     AAA-rated bonds.

  -  The securities BUT NOT THE FUND OR THE
     UNITS are backed by the full faith and
     credit of the United States.

  -  The Portfolio consists of two issues of
     Ginnie Maes, issued and guaranteed by
     GNMA, a United States government agency:
</TABLE>

<TABLE>
     - 8.50% Ginnie Maes                 63%
         maturing
<C>  <S>                             <C>
                                         37%
     - 9.50% Ginnie Maes
         maturing
</TABLE>

<TABLE>
<C>  <S>
 4.  WHAT ARE THE SIGNIFICANT RISKS?

     YOU CAN LOSE MONEY BY INVESTING IN THE
     FUND. THIS CAN HAPPEN FOR VARIOUS
     REASONS, INCLUDING:

  -  Rising interest rates can reduce the
     price of your units.

  -  Assuming no changes in interest rates,
     when you sell your units, they will
     generally be worth less than your cost
     because your cost included a sales fee.

  -  The Fund will receive early returns of
     principal when homeowners pay down their
     mortgages sooner than expected. This
     happens more often when interest rates
     fall. If this happens your income will
     decline and you may not be able to
     reinvest the money you receive at as high
     a yield or as long a maturity.

 5.  IS THIS FUND APPROPRIATE FOR YOU?

     Yes, if you want safety of capital and
     current monthly income. You will benefit
     from a professionally selected and
     supervised portfolio of U.S. government
     backed securities.
     The Fund is NOT appropriate for you if
     you want a speculative investment that
     changes to take advantage of market
     movements or if you cannot tolerate early
     returns of principal.
</TABLE>

<TABLE>
<C>  <S>
     DEFINING YOUR INCOME
</TABLE>

<TABLE>
<C>  <S>
     WHAT YOU MAY EXPECT (Payable on the 23rd day each
     month):
</TABLE>

<TABLE>
<C>  <S>                                            <C>
     Regular Monthly Income per 1,000 units:         $ 0.69
     Annual Income per 1,000 units:                  $ 8.29
     RECORD DAY: 17th day of each month

     THESE FIGURES ARE ESTIMATES ON THE EVALUATION DATE;
     ACTUAL PAYMENTS MAY VARY.
</TABLE>

<TABLE>
<C>  <S>
 6.  WHAT ARE THE FUND'S FEES AND EXPENSES?

     This table shows the costs and expenses you may pay,
     directly or indirectly, when you invest in the Fund.
</TABLE>

<TABLE>
<C>  <S>                                <C>
     INVESTOR FEES

                                          3.00%
     Maximum Sales Fee (Load) on new
     purchases (as a percentage of
     $1,000 invested)
</TABLE>

<TABLE>
<C>  <S>
     Employees of some of the Sponsors and their
     affiliates may be charged a reduced sales fee
     of no less than $5.00 per 1,000 Units.

     The maximum sales fee is reduced if you invest
     at least $100,000, as follows:
</TABLE>

<TABLE>
<CAPTION>
                                        YOUR MAXIMUM
                                         SALES FEE
            IF YOU INVEST:                WILL BE:
            --------------              ------------
<C>  <S>                            <C>
     Less than $100,000                       3.00%
     $100,000 to $249,999                     2.75%
     $250,000 to $499,999                     2.50%
     $500,000 to $999,999                     2.25%
     $1,000,000 and over                      2.00%

     Maximum Exchange Fee                     2.00%
</TABLE>

                                       3
<PAGE>

<TABLE>
<C>  <S>
     ESTIMATED ANNUAL FUND OPERATING EXPENSES
</TABLE>

<TABLE>
<CAPTION>
                                                    AMOUNT
                                                      PER
                                                  1,000 UNITS
                                                  -----------
<C>  <S>                                          <C>
                                                  $     0.09
     Trustee's Fee
                                                  $     0.24
     Portfolio Supervision,
     Bookkeeping and
     Administrative Fees
     (including updating
     expenses)
                                                  $     0.14
     Evaluator's Fee
                                                  $     0.21
     Other Operating Expenses
                                                  ----------
                                                  $     0.68
     TOTAL
</TABLE>

<TABLE>
<C>  <S>
     The Sponsors historically paid updating
     expenses.

 7.  IS THE FUND MANAGED?

     Unlike a mutual fund, the Fund is not managed
     and securities are not sold because of market
     changes. Rather, experienced Defined Asset
     Funds financial analysts regularly review the
     securities in the Fund. The Fund may sell a
     security if certain adverse credit or other
     conditions exist.

 8.  HOW DO I BUY UNITS?

     The minimum investment is $250.

     You can buy units from any of the Sponsors and
     other broker-dealers. The Sponsors are listed
     later in this prospectus. Some banks may offer
     units for sale through special arrangements
     with the Sponsors, although certain legal
     restrictions may apply.

     UNIT PRICE PER 1,000 UNITS            $109.91
     (as of September 30, 1999)

     Unit price is based on the net asset value of
     the Fund plus the up-front sales fee. An amount
     equal to any principal cash, as well as net
     accrued but undistributed interest on the unit,
     is added to the unit price. An independent
     evaluator prices the bonds at 3:30 p.m. Eastern
     time every business day. Unit price changes
     every day with changes in the prices of the
     bonds in the Fund.

 9.  HOW DO I SELL UNITS?

     You may sell your units at any time to any
     Sponsor or the Trustee for the net asset value
     determined at the close of business on the date
     of sale. You will not pay any other fee when
     you sell your units.
10.  HOW ARE DISTRIBUTIONS MADE AND TAXED?

     The Fund pays income monthly. Interest on the
     bonds in this Fund is subject to federal income
     taxes for U.S. investors.

     You will also receive principal payments when
     mortgages are prepaid, when the securities
     mature or if they are sold, when the cash
     available is more than $5.00 per 1,000 units.
     You will be subject to tax on any gain realized
     by the Fund on the disposition of securities.

11.  WHAT OTHER SERVICES ARE AVAILABLE?

     REINVESTMENT
     You will receive your monthly income in cash
     unless you choose to compound your income by
     reinvesting in the GNMA Fund Investment
     Accumulation Program, Inc. This Program is an
     open-end mutual fund with a comparable
     investment objective. Income from this program
     will be subject to U.S. federal income taxes
     for both U.S. and foreign investors. FOR MORE
     COMPLETE INFORMATION ABOUT THE PROGRAM,
     INCLUDING CHARGES AND FEES, ASK THE TRUSTEE FOR
     THE PROGRAM'S PROSPECTUS. READ IT CAREFULLY
     BEFORE YOU INVEST. THE TRUSTEE MUST RECEIVE
     YOUR WRITTEN ELECTION TO REINVEST AT LEAST 10
     DAYS BEFORE THE RECORD DAY OF AN INCOME
     PAYMENT.

     EXCHANGE PRIVILEGES
     You may exchange units of this Fund for units
     of certain other Defined Asset Funds. You may
     also exchange into this Fund from certain other
     funds. We charge a reduced sales fee on
     exchanges.

     CHECKWRITING
     You may request checkwriting privileges from
     the Trustee. Checks must be written for at
     least $500, and you may not receive
     certificates for your units.
</TABLE>

                                       4
<PAGE>
WHAT YOU CAN EXPECT FROM YOUR INVESTMENT

MONTHLY INCOME

The Fund will pay you regular monthly income. Your monthly income may vary
because of:
  - prepayments on the underlying mortgages;
  - elimination of one or more securities from the Fund's portfolio because of
    redemptions or sales; or
  - a change in the Fund's expenses;

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

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

RETURN FIGURES

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

ESTIMATED CURRENT RETURN equals the estimated annual cash to be received from
the securities in the Fund less estimated annual Fund expenses, divided by the
Unit Price (including the maximum sales fee):

<TABLE>
<S>              <C>  <C>
Estimated Annual         Estimated
Interest Income   -   Annual Expenses
- -------------------------------------
             Unit Price
</TABLE>

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

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

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

RECORDS AND REPORTS

You will receive:
- - a monthly statement of income payments and any principal payments;
- - a notice from the Trustee when new securities are deposited in exchange or
  substitution for securities originally deposited;
- - an annual report on Fund activity; and
- - annual tax information. THIS WILL ALSO BE SENT TO THE IRS. YOU MUST REPORT THE
  AMOUNT OF INTEREST RECEIVED DURING THE YEAR.

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

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

                                       5
<PAGE>
THE RISKS YOU FACE

INTEREST RATE RISK

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

PREPAYMENT RISK

You may receive payments of principal sooner than expected if many homeowners
prepay the mortgages that underly the Ginnie Maes. There is no prepayment
protection. Interest payments will also decrease as principal is returned.

REDUCED DIVERSIFICATION RISK

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

LITIGATION RISK

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

SELLING OR EXCHANGING UNITS

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

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

SPONSORS" SECONDARY MARKET

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

We have maintained a secondary market continuously for over 25 years, but we
could discontinue it without prior notice for any business reason.

SELLING UNITS TO THE TRUSTEE

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

Within seven days after your request and the necessary documents are received,
the Trustee

                                       6
<PAGE>
will mail a check to you. Contact the Trustee for additional information.

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

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

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

EXCHANGE OPTION

You may exchange units of certain Defined Asset Funds for units of this Fund at
a maximum exchange fee of 2.00%. You may exchange units of this Fund for units
of certain other funds at a reduced sales fee if your investment goals change.
To exchange units, you should talk to your financial professional about what
funds are exchangeable, suitable and currently available.

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

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

HOW THE FUND WORKS

PRICING

The price of a unit includes interest accrued on the securities, less expenses,
from the most recent Record Day up to, but not including, the settlement date,
which is usually three business days after the purchase date of the unit.

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

EVALUATIONS

An independent Evaluator values the securities on each business day (excluding
Saturdays, Sundays and the following holidays as observed by the New York Stock
Exchange: New Year's Day, Presidents" Day, Martin Luther King, Jr. Day, Good
Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving and Christmas;
and the following federal holidays: Columbus Day and Veterans Day). Values are
based on current bid or offer prices for the securities or comparable bonds. In
the past, the difference between bid and offer prices of Ginnie Mae securities
of the type in this Fund has ranged between 0.25% and 0.50%.

                                       7
<PAGE>
INCOME

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

EXPENSES

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

The Sponsors are currently reimbursed up to 55 CENTS per $1,000 face amount
annually for providing portfolio supervisory, bookkeeping and administrative
services and for any other expenses properly chargeable to the Fund. Legal,
typesetting, electronic filing and regulatory filing fees and expenses
associated with updating the Portfolio's registration statement yearly are also
now chargeable to the Portfolio. While this fee may exceed the amount of these
costs and expenses attributable to this Fund, the total of these fees for all
Series of Defined Asset Funds will not exceed the aggregate amount attributable
to all of these Series for any calendar year. The Fund also pays the Evaluator's
fees.

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

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

PORTFOLIO CHANGES

The Sponsors and Trustee are not liable for any default or defect in a security.

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

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

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

                                       8
<PAGE>
FUND TERMINATION

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

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

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

CERTIFICATES

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

TRUST INDENTURE

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

The Sponsors and the Trustee may amend the Indenture without your consent:
  - to cure ambiguities;
  - to correct or supplement any defective or inconsistent provision;
  - to make any amendment required by any governmental agency; or
  - to make other changes determined not to be materially adverse to your best
    interest (as determined by the Sponsors).

Investors holding 51% of the units may amend the Indenture. Every investor must
consent to any amendment that changes the 51% requirement. No amendment may
reduce your interest in the Fund without your written consent.

The Trustee may resign by notifying the Sponsors. The Sponsors may remove the
Trustee without your consent if:
  - it fails to perform its duties and the Sponsors determine that its
    replacement is in your best interest; or
  - it becomes incapable of acting or bankrupt or its affairs are taken over by
    public authorities.

Investors holding 51% of the units may remove the Trustee. The Evaluator may
resign or be removed by the Sponsors and the Trustee without the consent of
investors. The resignation or removal of either becomes effective when a
successor accepts appointment. The Sponsors will try to appoint a successor
promptly; however, if no successor has accepted within 30 days after notice of
resignation, the resigning Trustee or Evaluator may petition a court to appoint
a successor.

                                       9
<PAGE>
Any Sponsor may resign as long as one Sponsor with a net worth of $2 million
remains and agrees to the resignation. The remaining Sponsors and the Trustee
may appoint a replacement. If there is only one Sponsor and it fails to perform
its duties or becomes bankrupt the Trustee may:
  - remove it and appoint a replacement Sponsor;
  - liquidate the Fund; or
  - continue to act as Trustee without a Sponsor.

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

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

LEGAL OPINION

Davis Polk & Wardwell, 450 Lexington Avenue, New York, New York 10017, as
special counsel for the Sponsors, has given an opinion that the units are
validly issued.

AUDITORS

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

SPONSORS

The Sponsors are:
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED (a wholly-owned subsidiary of
Merrill Lynch & Co., Inc.)
P.O. Box 9051,
Princeton, NJ 08543-9051
SALOMON SMITH BARNEY INC. (an indirectly wholly-owned subsidiary of The
Citigroup Inc.)
388 Greenwich Street--23rd Floor,
New York, NY 10013
PRUDENTIAL SECURITIES INCORPORATED (an
indirect wholly-owned subsidiary of the
Prudential Insurance Company of America)
One New York Plaza
New York, NY 10292
PAINEWEBBER INCORPORATED (a wholly-owned subsidiary of PaineWebber Group Inc.)
1285 Avenue of the Americas,
New York, NY 10019

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

TRUSTEE

The Chase Manhattan Bank, Unit Investment Trust Departament, 4 New York
Plaza--6th Floor, New York, New York 10004, is the Trustee. It is supervised by
the Federal Deposit Insurance Corporation, the Board of Governors of the Federal
Reserve System and New York State banking authorities.

UNDERWRITERS" AND SPONSORS" PROFITS

Underwriters receive sales charges when they sell units. The Sponsors also
realized a profit

                                       10
<PAGE>
or loss on the initial deposit of the securities. Any cash made available by you
to the Sponsors before the settlement date for those units may be used in the
Sponsors" businesses to the extent permitted by federal law and may benefit the
Sponsors.

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

PUBLIC DISTRIBUTION

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

CODE OF ETHICS

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

YEAR 2000 ISSUES

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

TAXES

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

In the opinion of our counsel, under existing law:

GENERAL TREATMENT OF THE FUND AND YOUR INVESTMENT

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

GAIN OR LOSS UPON DISPOSITION

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

If your net long-term capital gains exceed your net short-term capital losses,
the excess may be subject to tax at a lower rate than ordinary income. Any
capital gain from the Fund will be long-term if you are considered to have held
your investment on each security for

                                       11
<PAGE>
more than one year and short-term otherwise. Because the deductibility of
capital losses is subject to limitations, you may not be able to deduct all of
your capital losses. You should consult your tax advisor in this regard.

YOUR BASIS IN THE SECURITIES

Your aggregate basis in the securities will be equal to the cost of your units,
including any sales charges and the organizational expenses you pay, adjusted to
reflect any accruals of 'original issue discount," "acquisition premium' and
"bond premium'. You should consult your tax adviser in this regard.

EXPENSES

If you are an individual who itemizes deductions, you may deduct your share of
Fund expenses, but only to the extent that such amount, together with your other
miscellaneous deductions, exceeds 2% of your adjusted gross income. Your ability
to deduct Fund expenses will be limited further if your adjusted gross income
exceeds a specified amount (for currently, $126,600 or $63,300 for a married
person filing separately).

FOREIGN INVESTORS

If you are a foreign investor and you are not engaged in a U.S. trade or
business, you generally will not be subject to U.S. federal income tax,
including withholding tax, on the interest or gain on a security issued after
July 18, 1984 if you meet certain requirements, including the certification of
foreign status and other matters. You should consult your tax adviser about the
possible application of federal, state and local, and foreign taxes.

RETIREMENT PLANS

You may wish to purchase units for an Individual Retirement Account (IRA) or
other retirement plan. Generally, capital gains and income received in each of
these plans are exempt from federal taxation. All distributions from such plans
are generally treated as ordinary inocme but may, in some cases, be eligible for
tax-deferred rollover treatment. You should consult your attorney or tax adviser
about the specific tax rules relating to these plans are offered by brokerage
firms, including the Sponsors of this Fund, and other financial institutions.
Fees and charges with respect to such plans may vary.

SUPPLEMENTAL INFORMATION

You can receive at no cost supplemental information about the Fund by calling
the Trustee. The supplemental information includes more detailed risk disclosure
about the Ginnie Maes that may be in the Fund's portfolio and general
information about the structure and operation of the Fund. The supplemental
information is also available from the SEC.

                                       12
<PAGE>

DEFINED ASSET FUNDS - GOVERNMENT SECURITIES INCOME FUND,
GNMA SERIES - 1K

REPORT OF INDEPENDENT ACCOUNTANTS

The Sponsors, Trustee and Holders
of Defined Asset Funds - Government Securities Income Fund,
GNMA Series - 1K:

We have audited the accompanying statement of condition of Defined Asset Funds -
Government Securities Income Fund, GNMA Series - 1K, including the portfolio, as
of September 30, 1999 and the related statements of operations and of changes in
net assets for the years ended September 30, 1999, 1998 and 1997. These
financial statements are the responsibility of the Trustee. Our responsibility
is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. Securities owned at
September 30, 1999, as shown in such portfolio, were confirmed to us by The
Chase Manhattan Bank, the Trustee. An audit also includes assessing the
accounting principles used and significant estimates made by the Trustee, as
well as evaluating the overall financial statement presentation. We believe that
our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Defined Asset Funds -
Government Securities Income Fund, GNMA Series - 1K at September 30, 1999 and
the results of its operations and changes in its net assets for the above-stated
years in conformity with generally accepted accounting principles.


DELOITTE & TOUCHE LLP

New York, N.Y.
November 10, 1999


                                     D - 1.
<PAGE>

DEFINED ASSET FUNDS - GOVERNMENT SECURITIES INCOME FUND,
GNMA SERIES - 1K

STATEMENT OF CONDITION
As of September 30, 1999

<TABLE>
<S>                                                 <C>             <C>
TRUST PROPERTY:
  Investment in marketable securities -
     at value (cost $ 2,617,257 )(Note 1).........                  $ 2,921,209
  Accrued interest ...............................                       20,513
  Cash - income ..................................                        3,056
  Cash - principal ...............................                          541
                                                                    -----------
    Total trust property .........................                    2,945,319


LESS LIABILITIES:
  Accrued Sponsors' fees .........................  $     3,686
  Trustee's fees and expenses payable ............        1,003           4,689
                                                    -----------     -----------


NET ASSETS, REPRESENTED BY:
  27,400,426 units of fractional undivided
     interest outstanding (Note 3)................    2,921,750

  Undistributed net investment income ............       18,880     $ 2,940,630
                                                    -----------     ===========

UNIT VALUE ($ 2,940,630 / 27,400,426 units )......                  $   0.10732
                                                                    ===========
</TABLE>

                       See Notes to Financial Statements.


                                     D - 2.
<PAGE>

DEFINED ASSET FUNDS - GOVERNMENT SECURITIES INCOME FUND,
GNMA SERIES - 1K

STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                                      Years Ended September 30,
                                               1999              1998              1997
                                               ----              ----              ----
<S>                                        <C>               <C>               <C>
INVESTMENT INCOME:
  Interest income ........................ $   293,461       $   437,273       $   563,115
  Trustee's fees and expenses ............     (12,250)          (14,272)          (15,615)
  Sponsors' fees .........................      (4,881)           (4,783)           (3,978)
                                           ------------------------------------------------
  Net investment income ..................     276,330           418,218           543,522
                                           ------------------------------------------------


REALIZED AND UNREALIZED GAIN (LOSS)
  ON INVESTMENTS:
  Realized gain on
    securities sold or redeemed ..........      79,083            67,620            79,624
  Unrealized depreciation
    of investments .......................    (204,480)         (141,959)          (52,727)
                                           ------------------------------------------------
  Net realized and unrealized
   loss on investments ...................    (125,397)          (74,339)          (26,897)
                                           ------------------------------------------------


NET INCREASE IN NET ASSETS
  RESULTING FROM OPERATIONS .............. $   150,933       $   343,879       $   570,419
                                           ================================================
</TABLE>

                       See Notes to Financial Statements.


                                     D - 3.
<PAGE>

DEFINED ASSET FUNDS - GOVERNMENT SECURITIES INCOME FUND,
GNMA SERIES - 1K

STATEMENTS OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                       Years Ended September 30,
                                                1999              1998              1997
                                                ----              ----              ----
<S>                                         <C>               <C>               <C>
OPERATIONS:
  Net investment income ..................  $   276,330       $   418,218       $   543,522
  Realized gain on
    securities sold or redeemed ..........       79,083            67,620            79,624
  Unrealized depreciation
    of investments .......................     (204,480)         (141,959)          (52,727)
                                            ------------------------------------------------
  Net increase in net assets
    resulting from operations ............      150,933           343,879           570,419
                                            ------------------------------------------------
DISTRIBUTIONS TO HOLDERS (Note 2):
  Income  ................................     (286,608)         (429,365)         (552,616)
  Principal ..............................   (1,372,760)       (1,517,984)       (1,139,304)
                                            ------------------------------------------------
  Total distributions ....................   (1,659,368)       (1,947,349)       (1,691,920)
                                            ------------------------------------------------
SHARE TRANSACTIONS:
  Redemption amounts - income ............                                           (1,241)
  Redemption amounts - principal .........                                         (237,707)
                                            ------------------------------------------------
  Total share transactions ...............                                         (238,948)
                                            ------------------------------------------------

NET DECREASE IN NET ASSETS ...............   (1,508,435)       (1,603,470)       (1,360,449)

NET ASSETS AT BEGINNING OF YEAR ..........    4,449,065         6,052,535         7,412,984
                                            ------------------------------------------------
NET ASSETS AT END OF YEAR ................  $ 2,940,630       $ 4,449,065       $ 6,052,535
                                            ================================================
PER UNIT:
  Income distributions during
    year .................................  $    .01046       $    .01567       $    .01994
                                            ================================================
  Principal distributions during
    year .................................  $    .05010       $    .05540       $    .04120
                                            ================================================
  Net asset value at end of
    year .................................  $    .10732       $    .16237       $    .22089
                                            ================================================
TRUST UNITS:
  Redeemed during year ...................                                          951,000
  Outstanding at end of year .............   27,400,426        27,400,426        27,400,426
                                            ================================================
</TABLE>

                       See Notes to Financial Statements.


                                     D - 4.
<PAGE>

DEFINED ASSET FUNDS - GOVERNMENT SECURITIES INCOME FUND,
GNMA SERIES - 1K

          NOTES TO FINANCIAL STATEMENTS

     1.   SIGNIFICANT ACCOUNTING POLICIES

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

           (A)      Securities are stated at value as determined by the
                    Evaluator based on bid side evaluations for the securities.

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

           (C) Interest income is recorded as earned.

     2.   DISTRIBUTIONS

          Distributions of combined interest and principal (plus any prepayments
          and redemption proceeds) are made to Holders each month. Receipts
          other than interest and principal paydowns, after deductions for
          redemptions and applicable expenses, are also distributed
          periodically.

     3.   NET CAPITAL

<TABLE>
<S>                                                                 <C>
     Cost of 27,400,426 units at Date of Deposit ................   $26,962,497
     Less sales charge ..........................................     1,077,385
                                                                    -----------
     Net amount applicable to Holders ...........................    25,885,112
     Redemptions of units - net cost of 9,064,225 units redeemed
       less redemption amounts (principal).......................     1,814,123
     Realized gain on securities sold or redeemed ...............     1,346,385
     Principal distributions ....................................   (26,427,822)
     Unrealized appreciation of investments......................       303,952
                                                                    -----------

     Net capital applicable to Holders ..........................   $ 2,921,750
                                                                    ===========
</TABLE>

     4.   INCOME TAXES

          All Fund items of income received, expenses paid, and realized gains
          and losses on securities sold are attributable to the Holders, on a
          pro rata basis, for Federal income tax purposes in accordance with the
          grantor trust rules of the United States Internal Revenue Code.

          At September 30, 1999, the cost of investment securities for Federal
          income tax purposes was the cost as shown in the Fund's portfolio.


                                     D - 5.
<PAGE>

DEFINED ASSET FUNDS - GOVERNMENT SECURITIES INCOME FUND,
GNMA SERIES - 1K

     PORTFOLIO
     As of September 30, 1999

<TABLE>
<CAPTION>
                                                              Range of
                                                 Interest      Stated             Face
        Security  Description                      Rate      Maturities(2)       Amount            Cost          Value(1)
     ---------------------------------           -------- ---------------- ---------------  ---------------  ---------------
<S>                                                <C>       <C>           <C>              <C>              <C>
   1 Government National Mortgage Association      8.500 %   07/15/16      $     1,757,191  $     1,619,601  $     1,828,104
     Modified Pass-Through Mortgage-Backed                      to
     Securities                                              12/15/18

   2 Government National Mortgage Association      9.500     03/15/16            1,018,807          997,656        1,093,105
     Modified Pass-Through Mortgage-Backed                      TO
     Securities                                              11/15/18

                                                                           ---------------  ---------------  ---------------
     TOTAL                                                                $      2,775,998 $      2,617,257  $     2,921,209
                                                                           ===============  ===============  ===============
</TABLE>

(1)   See Note 1 to Financial Statements.

(2)   On the Date of Deposit, the ranges of stated maturities were as follows:

      8.50% GNMA - 08/15/14 to 02/15/19
      9.50% GNMA - 08/15/14 to 12/15/19


                                     D - 6.
<PAGE>
              Defined
            Asset Funds

- -SM-
<TABLE>
<S>                                      <C>
HAVE QUESTIONS ?                         GOVERNMENT SECURITIES INCOME FUND
Request the most recent free             GNMA SERIES--1K
Information Supplement                   (A Unit Investment Trust)
that gives more details about            ---------------------------------------
the Fund, by calling:                    This Prospectus does not contain
The Chase Manhattan Bank                 complete information about the
1-800-323-1508                           investment company filed with the
                                         Securities and Exchange Commission in
                                         Washington, D.C. under the:
                                         - Securities Act of 1933 (file no.
                                         33-21457) and
                                         - Investment Company Act of 1940 (file
                                         no. 811-2810).
                                         TO OBTAIN COPIES AT PRESCRIBED RATES--
                                         WRITE: Public Reference Section of the
                                         Commission
                                         450 Fifth Street, N.W., Washington,
                                         D.C. 20549-6009
                                         CALL: 1-800-SEC-0330.
                                         VISIT: http://www.sec.gov.
                                         ---------------------------------------
                                         No person is authorized to give any
                                         information or representations about
                                         this Fund not contained in this
                                         Prospectus or the Information
                                         Supplement, and you should not rely on
                                         any other information.
                                         ---------------------------------------
                                         When units of this Fund are no longer
                                         available, this Prospectus may be used
                                         as a preliminary prospectus for a
                                         future series, but some of the
                                         information in this Prospectus will be
                                         changed for that series.
                                         UNITS OF ANY FUTURE SERIES MAY NOT BE
                                         SOLD NOR MAY OFFERS TO BUY BE ACCEPTED

                                         UNTIL THAT SERIES HAS BECOME EFFECTIVE
                                         WITH THE SECURITIES AND EXCHANGE
                                         COMMISSION. NO UNITS CAN BE SOLD IN ANY
                                         STATE WHERE A SALE WOULD BE ILLEGAL.
</TABLE>

                                                       12888--12/99
<PAGE>
                             DEFINED ASSET FUNDS--
                       GOVERNMENT SECURITIES INCOME FUND
                       CONTENTS OF REGISTRATION STATEMENT

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

    The facing sheet of Form S-6.

    The cross-reference sheet (incorporated by reference to the Cross-Reference
Sheet to the Registration Statement on Form S-6 of Defined Asset Funds Municipal
Insured Series, 1933 Act File No. 33-54565).

    The Prospectus.

    The Signatures.

The following exhibits:

    1.1.1-- Form of Standard Terms and Conditions of Trust Effective as of
           October 21, 1993 (incorporated by reference to Exhibit 1.1.1 to the
           Registration Statement of Municipal Investment Trust Fund,
           Multi-state Series--48, 1933 Act File No. 33-50247).

    4.1 --Consent of the Evaluator.

    5.1 --Consent of independent accountants.

    9.1 -- Information Supplement (incorporated by reference to Exhibit 9.1 to
          the Registration Statement of Government Securities Income Fund,
          Freddie Mac Series 12, 1933 Act File No. 33-56849.

                                      R-1
<PAGE>
                             DEFINED ASSET FUNDS--
                       GOVERNMENT SECURITIES INCOME FUND
                                GNMA SERIES--1K

                                   SIGNATURES

    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT,
DEFINED ASSET FUNDS GOVERNMENT SECURITIES INCOME FUND, GNMA SERIES--1K(A UNIT
INVESTMENT TRUST), HAS DULY CAUSED THIS AMENDMENT TO THE REGISTRATION STATEMENT
TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED THEREUNTO DULY AUTHORIZED IN THE
CITY OF NEW YORK AND STATE OF NEW YORK ON THE 1ST DAY OF DECEMBER, 1999.

               SIGNATURES APPEAR ON PAGES R-3, R-4, R-5 AND R-6.

    A majority of the members of the Board of Directors of Merrill Lynch,
Pierce, Fenner & Smith Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.

    A majority of the members of the Board of Directors of Salomon Smith Barney
Inc. has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.

    A majority of the members of the Board of Directors of Prudential Securities
Incorporated has signed this Registration Statement or Amendment to the
Registration Statement pursuant to Powers of Attorney authorizing the person
signing this Registration Statement or Amendment to the Registration Statement
to do so on behalf of such members.

    A majority of the members of the Executive Committee of the Board of
Directors of PaineWebber Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.

                                      R-2
<PAGE>
               MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
                                   DEPOSITOR

<TABLE>
<S>                                       <C>
By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under
  the Board of Directors of Merrill         Form SE and the following 1933 Act
  Lynch, Pierce,                            File
  Fenner & Smith Incorporated:              Numbers: 33-43466 and 33-51607
</TABLE>

     HERBERT M. ALLISON, JR.
     JOHN L. STEFFENS
     By ERNEST V. FABIO
       (As authorized signatory for Merrill Lynch, Pierce,
       Fenner & Smith Incorporated and
       Attorney-in-fact for the persons listed above)

                                      R-3
<PAGE>
                           SALOMON SMITH BARNEY INC.
                                   DEPOSITOR

<TABLE>
<S>                                                           <C>
By the following persons, who constitute a majority of        Powers of Attorney
  the Board of Directors of Salomon Smith Barney Inc.:          have been filed
                                                                under the 1933 Act
                                                                File Numbers:
                                                                333-63417 and
                                                                333-63033
</TABLE>

     MICHAEL A. CARPENTER
     DERYCK C. MAUGHAN

     By GINA LEMON
       (As authorized signatory for
       Salomon Smith Barney Inc. and
       Attorney-in-fact for the persons listed above)

                                      R-4
<PAGE>
                       PRUDENTIAL SECURITIES INCORPORATED
                                   DEPOSITOR

<TABLE>
<S>                                                                     <C>
By the following persons, who constitute a majority of                  Powers of Attorney
  the Board of Directors of Prudential Securities                         have been filed
  Incorporated:                                                           under Form SE and
                                                                          the following 1933
                                                                          Act File Numbers:
                                                                          33-41631 and
                                                                          333-15919
</TABLE>

     ROBERT C. GOLDEN
     ALAN D. HOGAN
     A. LAURENCE NORTON, JR.
     LELAND B. PATON
     VINCENT T. PICA II
     MARTIN PFINSGRAFF
     HARDWICK SIMMONS
     LEE B. SPENCER, JR.
     BRIAN M. STORMS

     By RICHARD R. HOFFMANN
       (As authorized signatory for Prudential Securities
       Incorporated and Attorney-in-fact for the persons
       listed above)

                                      R-5
<PAGE>
                            PAINEWEBBER INCORPORATED
                                   DEPOSITOR

<TABLE>
<S>                                       <C>
By the following persons, who constitute  Powers of Attorney have been filed
  the Board of Directors of PaineWebber     under
  Incorporated:                             the following 1933 Act File
                                            Number: 33-55073
</TABLE>

     MARGO N. ALEXANDER
     TERRY L. ATKINSON
     BRIAN M. BAREFOOT
     STEVEN P. BAUM
     MICHAEL CULP
     REGINA A. DOLAN
     JOSEPH J. GRANO, JR.
     EDWARD M. KERSCHNER
     JAMES P. MacGILVRAY
     DONALD B. MARRON
     ROBERT H. SILVER
     MARK B. SUTTON
     By ROBERT E. HOLLEY
       (As authorized signatory for
       PaineWebber Incorporated
       and Attorney-in-fact for the persons listed above)

                                      R-6



                                INTERACTIVE DATA
                          FINANCIAL TIMES INFORMATION
                           14 WALL STREET, 11th FLOOR
                            NEW YORK, NEW YORK 10005
                                 (212) 306-6596
                                FAX 212-306-6698

                                                                     EXHIBIT 4.1

                                                      December 1, 1999

Frank A. Ciccotto, Jr.
Vice President
Tax-Exempt Evaluations

<TABLE>
<S>                                       <C>
Merrill Lynch, Pierce, Fenner & Smith
Incorporated
Defined Asset Funds
P.O. Box 9051
Princeton, New Jersey 08543-9051

The Chase Manhattan Bank
4 New York Plaza, 6th Floor
New York, New York 10004
</TABLE>

RE: DEFINED ASSET FUNDS--MUNICIPAL INVESTMENT TRUST FUND,
    GNMA SERIES--1K

Gentlemen:

  We have examined the post-effective Amendment to the Registration Statement
File No. 33-21457 for the above-captioned trust.

  We hereby consent to the reference to Interactive Data Services, Inc. in the
Prospectus contained in the Post-Effective No. 11 to the Registration Statement
for the above captioned Fund and to the use of the evaluations of the
Obligations prepared by us which are referred to in such Prospectus and
Registration Statement.

  You are hereby authorized to file copies of this letter with the Securities
and Exchange Commission.

                                                      Sincerely,
                                                      JAMES PERRY
                                                      Vice President



                                                                     Exhibit 5.1
                       CONSENT OF INDEPENDENT ACCOUNTANTS

The Sponsors and Trustee of
Defined Asset Funds--Government Securities Income Fund--GNMA Series--1K

We consent to the use in this Post-Effective Amendment No. 11 to Registration
Statement No. 33-21457 of our opinion dated November 10, 1999 appearing in the
Prospectus, which is part of such Registration Statement, and to the reference
to us under the heading "Miscellaneous--Auditors' in such Prospectus.

DELOITTE & TOUCHE LLP
New York, N.Y.
December 1, 1999



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