| Country | Action | Action Date | Effective Date |
|---|
| BRAZIL | Acceptance | 17/12/1963 | |
| BRAZIL | Withdrawal | 20/07/1965 | |
| British Guiana | Extension | 17/03/1961 | |
| British Honduras | Extension | 17/03/1961 | |
| CHILE | Acceptance | 07/10/1965 | |
| COSTA RICA | Acceptance | 30/01/1963 | |
| CUBA | Acceptance | 22/11/1960 | |
| DOMINICAN REPUBLIC | Acceptance | 05/04/1965 | |
| ECUADOR | Acceptance | 17/11/1960 | |
| FRANCE | Acceptance | 26/10/1960 | |
| GUATEMALA | Acceptance | 05/10/1960 | |
| GUATEMALA | Withdrawal | 20/11/1962 | |
| HAITI | Acceptance | 30/03/1961 | |
| HONDURAS | Acceptance | 14/08/1962 | |
| NETHERLANDS THE | Acceptance | 16/11/1960 | |
| NICARAGUA | Acceptance | 08/11/1960 | |
| NICARAGUA | Denunciation | 30/04/1962 | |
| PANAMA | Acceptance | 16/11/1960 | |
| PERU | Acceptance | 06/12/1960 | 06/12/1960 |
| PERU | Denunciation | 29/12/1977 | 29/06/1978 |
| TRINIDAD AND TOBAGO | Acceptance | 02/02/1973 | |
| UNITED KINGDOM | Signature | 20/11/1959 | |
| UNITED KINGDOM | Acceptance | 17/03/1961 | |
| UNITED KINGDOM | Declaration | 17/03/1961 | |
| VENEZUELA | Acceptance | 11/10/1960 | |
| VENEZUELA | Denunciation | 20/02/1980 | 20/08/1980 |
| West Indies | Extension | 17/03/1961 | |