| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 16/02/1961 | |
| BELGIUM | Ratification | 01/10/1969 | |
| FRANCE | Signature | 16/02/1961 | |
| FRANCE | Ratification | 13/06/1962 | |
| ITALY | Accession | 15/11/1974 | 15/12/1974 |
| LUXEMBOURG | Signature | 16/02/1961 | |
| LUXEMBOURG | Ratification | 23/12/1963 | |
| MONACO | Signature | 16/02/1961 | |
| MONACO | Ratification | 13/12/1962 | |
| MOROCCO | Signature | 28/06/1961 | |
| NETHERLANDS THE | Signature | 16/02/1961 | |
| NETHERLANDS THE | Ratification | 04/09/1963 | |
| SWITZERLAND | Signature | 16/02/1961 | |
| SWITZERLAND | Ratification | 03/05/1962 | |
| TURKEY | Signature | 29/12/1961 | |
| TURKEY | Ratification | 30/11/1971 | |
| UNITED KINGDOM | | | |
| YUGOSLAVIA | Signature | 16/02/1961 | |