| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Signature | 26/07/1957 | |
| AUSTRIA | Ratification | 02/10/1957 | |
| BELGIUM | Signature | 15/12/1956 | |
| BELGIUM | Reservation | 15/12/1956 | |
| BELGIUM | Ratification | 05/06/1972 | |
| BELGIUM | Declaration | 05/06/1972 | |
| Berlin West | Extension | 08/12/1964 | 08/12/1964 |
| BOSNIA AND HERZEGOVINA | Accession | 29/12/1994 | 29/12/1994 |
| CROATIA | Accession | 27/01/1993 | 27/01/1993 |
| CYPRUS | Signature | 18/09/1970 | |
| CZECH REPUBLIC | Succession | 08/01/1993 | 01/01/1993 |
| CZECHOSLOVAKIA | Signature | 26/03/1991 | |
| CZECHOSLOVAKIA | Approval | 26/03/1991 | 26/03/1991 |
| DENMARK | Signature | 15/12/1956 | |
| DENMARK | Ratification | 23/06/1958 | |
| ESTONIA | Signature | 14/05/1993 | |
| FINLAND | Signature | 16/09/1991 | |
| FINLAND | Ratification | 16/09/1991 | 16/09/1991 |
| FRANCE | Signature | 15/12/1956 | |
| FRANCE | Ratification | 18/02/1958 | |
| GERMANY FEDERAL REPUBLIC | Signature | 15/12/1956 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 08/12/1964 | |
| GERMANY FEDERAL REPUBLIC | Declaration | 08/12/1964 | |
| GREECE | Signature | 16/09/1960 | |
| GREECE | Declaration | 07/07/1994 | |
| HUNGARY | Signature | 03/02/1992 | |
| ICELAND | Signature | 15/12/1956 | |
| ICELAND | Ratification | 05/04/1963 | |
| IRELAND, REPUBLIC OF | Signature | 15/12/1956 | |
| IRELAND, REPUBLIC OF | Ratification | 20/02/1957 | |
| Isle of Man | Extension | 05/01/1996 | 05/01/1996 |
| ITALY | Signature | 15/12/1956 | |
| ITALY | Ratification | 29/03/1958 | |
| LIECHTENSTEIN | Signature | 22/05/1991 | |
| LIECHTENSTEIN | Ratification | 22/05/1991 | 22/05/1991 |
| LUXEMBOURG | Signature | 15/12/1956 | |
| LUXEMBOURG | Ratification | 23/01/1968 | |
| MACEDONIA THE FYR OF | Accession | 30/03/1994 | |
| MALTA | Signature | 22/09/1967 | |
| MALTA | Ratification | 07/05/1968 | |
| NETHERLANDS THE | Signature | 15/12/1956 | |
| NETHERLANDS THE | Ratification | 10/12/1959 | |
| NORWAY | Signature | 15/12/1956 | |
| NORWAY | Ratification | 14/03/1957 | |
| Nyasaland | Extension | | 02/01/1958 |
| POLAND | Signature | 11/07/1994 | |
| POLAND | Ratification | 10/10/1994 | 10/10/1994 |
| PORTUGAL | Signature | 27/04/1978 | |
| PORTUGAL | Ratification | 08/09/1982 | |
| Rhodesia | Extension | | 02/01/1958 |
| ROMANIA | Signature | 02/10/1995 | |
| ROMANIA | Ratification | 19/05/1998 | 19/05/1998 |
| RUSSIAN FEDERATION | Signature | 07/11/1996 | |
| RUSSIAN FEDERATION | Ratification | 17/09/1999 | 17/09/1999 |
| SLOVAK REPUBLIC | Succession | 08/01/1993 | 01/01/1993 |
| SLOVENIA | Accession | 02/07/1992 | 02/07/1992 |
| SPAIN | Accession | 25/04/1975 | |
| SWEDEN | Signature | 15/12/1957 | |
| SWEDEN | Ratification | 21/06/1967 | |
| SWITZERLAND | Signature | 25/04/1991 | |
| SWITZERLAND | Ratification | 25/04/1991 | 25/04/1991 |
| SWITZERLAND | Declaration | 25/04/1991 | |
| TURKEY | Signature | 25/09/1957 | |
| TURKEY | Ratification | 18/02/1960 | |
| UNITED KINGDOM | Signature | 15/12/1956 | |
| UNITED KINGDOM | Ratification | 18/09/1957 | |
| UNITED KINGDOM | Declaration | 18/09/1957 | |
| UNITED KINGDOM | Declaration | 05/01/1996 | 05/01/1996 |
| YUGOSLAVIA | Accession | 15/09/1977 | |