Exhibit 10.21

                       AMERICAN LOCKER GROUP INCORPORATED
                    SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN


ARTICLE I.  PURPOSE OF THE PLAN

            The purposes of the American Locker Group Incorporated  Supplemental
Executive Retirement Plan are to recognize the substantial  contributions to the
success and profitability of American Locker Group  Incorporated (the "Company")
made by certain  executive  level employees who have served the Company for many
years and, thereby,  to promote and maintain the profitability of the Company by
attracting and retaining executives of outstanding competence.

ARTICLE II. DEFINITIONS

            In this  Plan,  the  following  words  and  phrases  shall  have the
following meanings:

            2.01 "ACTUAL RETIREMENT" shall mean the date upon which the Eligible
Executive  ceases (for reasons other than death) all active  employment with the
Company.
            2.02  "BOARD" shall mean the Board of Directors of the Company.

            2.03  "CHANGE OF CONTROL" shall mean a change in ownership or

control of the Company such that:

                  (i) any  "person" as such term is used in  Sections  13(d) and
      14(d)  of the  Securities  and  Exchange  Act of  1934,  as  amended  (the
      "Exchange Act") (other than the Company, or any Company owned, directly or
      indirectly,  by the stockholders of the Company in substantially  the same
      proportions as their ownership of stock of the Company), is or becomes the
      "beneficial  owner"  (as  defined  in Rule 13d-3  under the  Exchange  Act
      whether or not the Company is then subject to the Exchange Act),  directly
      or indirectly,  of securities of the Company  representing more than fifty
      percent  (50%)  of  the  combined  voting  power  of  the  Company's  then
      outstanding securities; or

                  (ii)  during  any  period of two (2)  consecutive  years  (not
      including any period prior to the execution of this Trust Agreement) there
      shall  cease  to  be  a  majority  of  



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      the Board  comprised as follows:  individuals who at the beginning of such
      period constituted the Board and any new director(s) whose election by the
      Board  or  nomination  for  election  by the  Company's  stockholders  was
      approved by a vote of at least a majority of the  directors  then still in
      office who either were  directors at the  beginning of the period or whose
      election or nomination for election was previously so approved; or

                  (iii)  the  stockholders  of the  Company  approve a merger or
      consolidation  of the  Company  with any other  corporation,  other than a
      merger or consolidation which would result in the voting securities of the
      Company  outstanding  immediately  prior  thereto  continuing to represent
      (either  by  remaining  outstanding  or by  being  converted  into  voting
      securities  of the surviving  entity) at least 80% of the combined  voting
      power of the voting  securities  of the Company or such  surviving  entity
      outstanding   immediately   after  such  merger  or   consolidation,   the
      stockholders of the Company approve a plan of complete  liquidation of the
      Company,  or the Company  enters into an  agreement  for the sale or other
      disposition  of all or  substantially  all of the Company's  assets,  in a
      single  transaction  or a series of related  transactions,  or the Company
      otherwise disposes of such assets.

            2.04  "COMMITTEE"  shall  mean a  committee  of no less  than  three
persons appointed by the Board to administer this Plan;  provided,  however,  in
the event the Board, in its discretion, has not or does not appoint a Committee,
or in the event that the members of such  Committee  have resigned or are unable
to serve for any  reason,  "Committee"  shall mean the Board of  Directors;  and
provided  further,  no person who has been  designated as an Eligible  Executive
shall be  permitted  to take part in the  deliberations  of the  Committee  with
regard to a determination of his or her  participation in or benefits under this
Plan.

            2.05  "COMPANY"  shall mean American  Locker Group  Incorporated,  a
Delaware  corporation,  with its principal  place of business in Jamestown,  New
York.
            2.06 "ELIGIBLE  EXECUTIVE"  shall mean an officer or key employee of
the Company (or of a corporation  the majority of the stock of which is owned by
the Company)  who is  designated  as an Eligible  Executive by the Board and who
acknowledges  and agrees in writing to be bound by the terms and  conditions  of
the Plan.  No  director  who is not or was not also an  employee  may  become an
Eligible Executive.

            2.07  "HEALTH  BENEFIT"  shall mean an insurance  arrangement  which
supplements  Medicare,  if such  arrangement  is then  offered  by an  insurance
company licensed to do business in any state in the United States.

            2.08  "PLAN"  shall mean this  American  Locker  Group  Incorporated
Supplemental Executive Retirement Plan.


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            2.09 "SPOUSE" shall mean the person to whom the Eligible Employee is
married at the time of his or her death.

            2.10 "SPOUSE BENEFIT" is a monthly amount equal to 50% of the amount
of  an  Eligible  Employee's   Supplemental  Benefit  payable  to  the  Eligible
Employee's  Spouse for the Spouse's  life  commencing  with the first day of the
month next  following the Eligible  Employee's  death and  continuing  until the
first day of the month immediately preceding the death of the Spouse.

            2.11  "SUPPLEMENTAL  BENEFIT"  shall  mean a  benefit  payable  in a
monthly  amount  determined  by the Board of  Directors  at the time an Eligible
Employee is designated as eligible to  participate  in this Plan for the life of
the Eligible  Executive on the first day of each month commencing with the month
in which the  earlier of the events  described  in Section 4.1 occurs and ending
with the month in which the Eligible Executive's death occurs.

ARTICLE III.      ELIGIBILITY TO PARTICIPATE

            An  executive   employee  of  the  Company   shall  be  entitled  to
participate  in this Plan  only if he or she (i) is  designated  as an  Eligible
Executive  under  this  Plan by the  Board of  Directors  in a  resolution  duly
adopted,  (ii) the resolution of the Board of Directors designating the Eligible
Employee  sets  forth the  amount of the  Supplemental  Benefit  payable  to the
Eligible  Employee or a formula or other method of determining the  Supplemental
Benefit  payable to the Eligible  Employee,  (iii) is notified in writing of the
Board's  resolution  and of the terms and conditions of the Plan and (iv) agrees
in writing, in a form acceptable to the Committee,  to be bound by the terms and
conditions  of  this  Plan.   The  Committee   shall  cause  each  person  whose
recommendation  is accepted to be notified in writing of his or her  eligibility
to  participate  in the Plan and to be supplied with a written copy of this Plan
as then in effect.  Except  with  respect to  employees  designated  as Eligible
Executives  in  accordance  with this  Article  III, no  employee  and no person
claiming  through an employee  shall have any right to any  benefits  under this
Plan.

ARTICLE IV. BENEFITS UNDER THE PLAN

            4.01  BENEFIT PAYABLE TO THE ELIGIBLE EXECUTIVE.           
            Commencing  with the earlier of a Change in Control or the  Eligible
Executive's Actual Retirement,  the Company shall pay or cause to be paid to the
Eligible  Executive  the  Supplemental  Benefit  and shall  cause  the  Eligible
Executive and the Eligible Executive's  dependents,  if any, to be covered under
the Health Benefit for the life of the Eligible  Employee.  4.02 BENEFIT PAYABLE
TO SPOUSE. If the Spouse survives the Eligible Executive,  the Company shall pay
to the Spouse the Spouse  Benefit  and shall  cause the Spouse and the  Spouse's
dependents,  if any, to be covered under the Health  Benefit for the life of the
Spouse. 4.03 CESSATION OF COMPANY OBLIGATION. Upon the death of the later to die
of the Eligible Executive and the Spouse, the Company's  obligation with respect
to an Eligible  Executive  shall cease and no amount shall be payable under this
Plan to any other person.

ARTICLE V.  MISCELLANEOUS

            5.01 ADMINISTRATION.
            This Plan shall be  administered  by the Committee  which shall have
all powers and authority necessary to interpret the Plan and take any action the
Committee,  in its collective  discretion,  deems necessary or appropriate.  The
determinations  and action of the Committee  shall be final and binding upon the
Company and each Eligible Executive.

            5.02  WITHHOLDING.
            To the  extent  amounts  payable  hereunder  are  determined  by the
Company in good faith to be subject to federal,  state or local  income or other
tax, the Company may withhold from each such payment an amount necessary to meet
the payor's obligation under the applicable federal, state or local law.

            5.03  NO SEPARATE FUND.
            The amounts  payable  under this Plan are  payable  from the general
assets of the  Company  and no special  fund or  arrangement  is  intended to be
established hereby nor shall the Company be required to earmark,  place in trust
or  otherwise  segregate  assets  with  respect  to this  Plan  or any  benefits
hereunder. In the event any amount becomes payable under this Plan, the payee or
potential payee of such amount shall have rights no greater than the rights of a
general creditor of the Company.

            5.04  GOVERNING LAW.
            This Plan shall be construed  under the laws of the  Commonwealth of
Pennsylvania, without regard to its principles of conflict of laws.

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            5.05  FUTURE EMPLOYMENT.
            Eligibility  to  participate  in this Plan shall not be construed as
providing to any Eligible  Executive the right to be retained in the  employment
of the Company.

            5.06  NO PLEDGE OR ATTACHMENT.
            No benefit  which is or may become  payable under this Plan shall be
subject to any anticipation,  alienation, sale, transfer, pledge, encumbrance or
hypothecation  or subject to any  attachment,  levy or similar  process  and any
attempt to effect any such action shall be null and void.

            5.07  AMENDMENT AND TERMINATION; EFFECT ON BENEFITS.
            This Plan may not be terminated until all benefits payable to or
with respect to each  Eligible  Employee have been paid in full. No amendment or
purported  amendment  to  this  Plan  shall  have  the  effect  of  reducing  or
eliminating  an benefit  accrued  hereunder as of the date of such  amendment or
causing any Eligible Employee (or his Spouse) to cease to be eligible to receive
benefits  hereunder.  This Plan may not be  amended  or  terminated  (except  to
increase benefits hereunder) after the earliest to occur of the following:
            
            (a) the Actual  Retirement  of the  Executive;  
            (b) the death of the Eligible Executive; or 
            (c) a Change in Control of the Company.


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ARTICLE VI. EXECUTION

            To record the due adoption of this Plan,  the Company has caused its
duly  authorized  officer to execute the Plan, for and on behalf of the Company,
as of the 1st day of January, 1998.

                              AMERICAN LOCKER GROUP INCORPORATED


                              By:    /S/ROY J. GLOSSER
                                     ---------------------
                                     Roy J. Glosser
                              Title: President and Chief Operating Officer