Exhibit 4a
                                                                     Page 1

                          Front Side of Certificate of Stock

                                 Picture of Scientist
                              in early laboratory scene
                          FOUNDED IN 1923 BY HERMAN O. WEST

          Number                                                   Shares

          W_______________
               COMMON STOCK                              COMMON STOCK
          INCORPORATED UNDER THE LAWS                  CUSIP 955306 10 5
          OF THE COMMONWEALTH OF
          PENNSYLVANIA

                          WEST PHARMACEUTICAL SERVICES, INC.

               This certifies that

                                                                SEE REVERSE
                                                                FOR CERTAIN
                                                                DEFINITIONS

               is the owner of

           FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK OF THE
          PAR VALUE OF $.25 PER SHARE OF

          West Pharmaceutical  Services, Inc. transferable on  the books of
          the  corporation  by  the holder  hereof  in  person  or by  duly
          authorized attorney upon  surrender of this certificate  properly
          endorsed.  This certificate and the shares represented hereby are
          issued and shall be held subject to all the provisions of (1) the
          Articles of Incorporation and all amendments thereto  and (2) any
          statement on the reverse side of this certificate.

               This certificate  is  not  valid  unless  countersigned  and
               registered by the Transfer Agent and Registrar.
               Witness  the  facsimile  seal  of the  corporation  and  the
               facsimile signatures of its duly authorized officers.

          Dated:

          John R. Gailey      Picture of               William G. Little
          Secretary           Company Seal             Chairman of the Board

                                              COUNTERSIGNED AND REGISTERED:
                                    AMERICAN STOCK TRANSFER & TRUST COMPANY
                                        (NEW YORK, N.Y.)
                                   BY                        TRANSFER AGENT
                                                              AND REGISTRAR

                                   AUTHORIZED SIGNATURE

             



                          Back side of Certificate of Stock          Page 2

               The following abbreviations, when used in the inscription on
          the face of this  certificate, shall be construed as  though they
          were  written  out  in  full  according  to  applicable  laws  or
          regulations:

          TEN COM - as tenants in common     UNIF GIFT MIN ACT --Custodian --
          TEN ENT -    as tenants by the                 (Cust)      (Minor)
                    entireties               under Uniform Gifts to Minors
          JT TEN  - as joint tenants         Act_________________________
                    with right of                      (State)
                    survivorship and not
                    as tenants in common

          Additional abbreviations may also be used though not in the above
          list.

               For value received, ________hereby sell, assign and transfer
          unto

          PLEASE INSERT SOCIAL SECURITY OR OTHER
          IDENTIFYING NUMBER OF ASSIGNEE______________________

          _________________________________________________________________
          (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS,  INCLUDING ZIP CODE,
          OF ASSIGNEE)
          _________________________________________________________________
          _________________________________________________________________
          _________________________________________________________________

          of the capital  stock represented by the within  Certificate, and
          do hereby irrevocably constitute and appoint
          __________________________________________   Attorney to transfer
          the said stock on  the books of the within named Corporation with
          full power of substitution in the premises.

          Dated______________________


          ___________________________________________________________
          NOTICE:  The signature to this agreement must correspond with the
          name  as  written  upon the  face  of  the  certificate in  every
          particular,  without  alteration  or enlargement  or  any  change
          whatever.





               This  certificate also  evidences  and  entitles the  holder
          hereof to certain Flip-In Rights as set forth in a Flip-In Rights
          Agreement  between  The West  Company, Incorporated  and American
          Stock  Transfer  & Trust  Company, as  Right  Agent, dated  as of
          January 16, 



         


                    Back Side of Certificate of Stock (continued)    Page 3


          1990  (the "Rights  Agreement"),  the terms  of which  are hereby
          incorporated herein  by reference and a copy  of which is on file
          at  the  principal  executive  offices  of   West  Pharmaceutical
          Services, Inc..

               Under  certain circumstances  , as set  forth in  the Rights
          Agreement,  such Flip-In  Rights  will be  evidenced by  separate
          certificates and will no longer be evidenced by this certificate.
          The Company will mail to the holder of this certificate a copy of
          the  Rights Agreement,  as  in effect  on  the date  of  mailing,
          without charge  promptly following  receipt of a  written request
          therefor.

               Under  certain  circumstances,  Flip-In Rights  beneficially
          owned by  Acquiring Persons  or Associates or  Affiliates thereof
          (as defined in the Rights Agreement) and any subsequent holder of
          such Flip-In Rights may become null and void.

               This  certificate also  evidences  and entitles  the  holder
          hereof  to certain Flip-Over Rights  as set forth  in a Flip-Over
          Rights  Agreement  between The  West  Company, Incorporated,  and
          American Stock Transfer  & Trust Company, as  Rights Agent, dated
          as of January  16, 1990  (the "Rights Agreement"),  the terms  of
          which are hereby incorporated  herein by reference and a  copy of
          which  is on  file  at the  principal  executive offices  of  the
          Company.

               Under  certain circumstances,  as  set forth  in the  Rights
          Agreement, such  Flip-Over Rights  will be evidenced  by separate
          certificates and will no longer be evidenced by this certificate.
          The Company will mail to the holder of this certificate a copy of
          the  Rights Agreement,  as  in effect  on  the date  of  mailing,
          without charge  promptly following  receipt of a  written request
          therefor.