SIXTH AMENDMENT TO MANUFACTURING AGREEMENT


            This  Sixth  Amendment  made as of May 13,  1999,  to  Manufacturing
Agreement dated December 29, 1989 between SIGNORE,  INC., a Delaware corporation
("Seller") and AMERICAN LOCKER SECURITY  SYSTEMS,  INC., a Delaware  corporation
("Buyer").

            WHEREAS,  Seller and Buyer are parties to a Manufacturing  Agreement
dated  December 29,  1989,  as amended by the First  Amendment to  Manufacturing
Agreement dated as of May 3, 1995, as further amended by the Second Amendment to
Manufacturing  Agreement  dated as of March 15, 1996, as further  amended by the
Third Amendment to Manufacturing  Agreement dated as of May 21, 1996, as further
amended by the Fourth Amendment to  Manufacturing  Agreement dated as of May 20,
1997, and as further amended by the Fifth Amendment to  Manufacturing  Agreement
dated as of May 19,  1998 (such  Manufacturing  Agreement,  as so  amended,  the
"Amended Agreement"); and

            WHEREAS,  Seller and Buyer wish to make  certain  amendments  to the
Amended Agreement.

            NOW, THEREFORE, for good and valuable consideration and intending to
be legally bound hereby, Seller and Buyer agree as follows:

            1.    All defined terms used herein shall have the  definitions  set
                  forth in the Amended Agreement.

            2.    Buyer and Seller acknowledge that as of December 31, 1998, the
                  Remaining  Inventory Value of Locker  Inventory (as defined in
                  Section  3(f) of the Amended  Agreement)  was  $1,353,988.  In
                  accordance  with the provisions of Section 3(f) of the Amended
                  Agreement,  Buyer  has  paid to  Seller  the  sum of  $52,649,
                  receipt of which is acknowledged by Seller.


            Such $52,649 payment is calculated as follows:

            Actual Inventory 12/31/98                                 $1,353,988
            Remaining Inventory Value 1/1/98                           1,301,339
            Payment Due from Buyer to Seller                          $   52,649
                                                                      ==========


            3.    Buyer and Seller agree that Locker  Inventory  determined on a
                  pro forma  basis as of December  31,  1998 as if all  payments
                  required  under Section 2 hereof had been made as of that date
                  was $1,353,988 (i.e.  Remaining Locker Inventory as of January
                  1, 1998 of $1,301,339  plus the $52,649  payment made by Buyer
                  under Section 2 hereof).

            4.    Except as expressly  provided  herein,  the Amended  Agreement
                  shall remain unamended and in full force and effect.






            WITNESS the due execution hereof.

                                          SIGNORE, INC.

                                          By  /s/ ALEX N. DITONTO
                                          Title:  Chairman and Chief Executive
                                                  Officer


                                          AMERICAN LOCKER SECURITY SYSTEMS, INC.


                                          By  /s/ EDWARD F. RUTTENBERG
                                            ------------------------------------
                                          Title:  Chairman and Chief Executive
                                                  Officer