| Country | Action | Action Date | Effective Date |
|---|
| AUSTRALIA | Accession | 07/06/1971 | |
| AUSTRIA | Signature | 14/12/1960 | |
| AUSTRIA | Ratification | 29/09/1961 | |
| BELGIUM | Signature | 14/12/1960 | |
| BELGIUM | Ratification | 13/09/1961 | |
| Bermuda | Extension | 20/07/1990 | 20/07/1990 |
| CANADA | Signature | 14/12/1960 | |
| CANADA | Ratification | 10/04/1961 | |
| Channel Islands | Extension | 20/07/1990 | 20/07/1990 |
| DENMARK | Signature | 14/12/1960 | |
| DENMARK | Ratification | 30/05/1961 | |
| FINLAND | Accession | 28/01/1969 | |
| FRANCE | Signature | 14/12/1960 | |
| FRANCE | Ratification | 07/08/1961 | |
| GERMANY | Signature | 14/12/1960 | |
| GERMANY | Ratification | 27/09/1961 | |
| Gibraltar | Extension | 20/07/1990 | 20/07/1990 |
| GREECE | Signature | 14/12/1960 | |
| GREECE | Ratification | 27/09/1961 | |
| ICELAND | Signature | 14/12/1960 | |
| ICELAND | Ratification | 05/06/1961 | |
| IRELAND, REPUBLIC OF | Signature | 14/12/1960 | |
| IRELAND, REPUBLIC OF | Ratification | 17/08/1961 | |
| Isle of Man | Extension | 20/07/1990 | 20/07/1990 |
| ITALY | Signature | 14/12/1960 | |
| ITALY | Ratification | 29/03/1962 | |
| JAPAN | Accession | 28/04/1964 | |
| LUXEMBOURG | Signature | 14/12/1960 | |
| LUXEMBOURG | Ratification | 07/12/1961 | |
| NETHERLANDS THE | Signature | 14/12/1960 | |
| NETHERLANDS THE | Ratification | 13/11/1961 | |
| NEW ZEALAND | Accession | 29/05/1973 | |
| NORWAY | Signature | 14/12/1960 | |
| NORWAY | Ratification | 04/07/1961 | |
| PORTUGAL | Signature | 14/12/1960 | |
| PORTUGAL | Ratification | 04/08/1961 | |
| SPAIN | Signature | 14/12/1960 | |
| SPAIN | Ratification | 03/08/1961 | |
| SWEDEN | Signature | 14/12/1960 | |
| SWEDEN | Ratification | 28/09/1961 | |
| SWITZERLAND | Signature | 14/12/1960 | |
| SWITZERLAND | Ratification | 28/09/1961 | |
| TURKEY | Signature | 14/12/1960 | |
| TURKEY | Ratification | 02/08/1961 | |
| UNITED KINGDOM | Signature | 14/12/1960 | |
| UNITED KINGDOM | Ratification | 02/05/1961 | |
| UNITED KINGDOM | Communication | 20/07/1990 | |
| UNITED STATES OF AMERICA | Signature | 14/12/1960 | |
| UNITED STATES OF AMERICA | Ratification | 12/04/1961 | |