| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| Bermuda | Accession | 01/12/1930 | |
| British Guiana | Accession | 01/12/1930 | |
| Falkland Islands | Accession | 01/12/1930 | |
| Jamaica | Accession | 01/12/1930 | |
| Malta | Accession | 01/12/1930 | |
| Seychelles | Accession | 01/12/1930 | |
| SOVIET UNION | |||
| Trinidad And Tobago | Accession | 01/12/1930 | |
| UNITED KINGDOM | Signature | 16/04/1930 | |
| Windward Islands | Accession | 01/12/1930 |