| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| Bahamas | Signature | 25/11/1930 | |
| Barbados | Accession | 25/11/1930 | |
| Bermuda | Accession | 25/11/1930 | |
| British Guiana | Accession | 25/11/1930 | |
| British Honduras | Accession | 25/11/1930 | |
| British Virgin Islands | Accession | 25/11/1930 | |
| Cyprus | Accession | 25/11/1930 | |
| Falkland Islands | Accession | 25/11/1930 | |
| Fiji | Accession | 25/11/1930 | |
| Gibraltar | Accession | 25/11/1930 | |
| Gilbert & Ellice Colony | Accession | 25/11/1930 | |
| Gold Coast | Accession | 25/11/1930 | |
| Hong Kong | Accession | 25/11/1930 | |
| ITALY | Signature | 25/01/1929 | |
| Jamaica | Accession | 25/11/1930 | |
| Kenya | Accession | 25/11/1930 | |
| Leeward Islands | Accession | 25/11/1930 | |
| Malay States, Federated | Accession | 25/11/1930 | |
| Malay States, Unfederated | Accession | 25/11/1930 | |
| Malta | Accession | 25/11/1930 | |
| Mauritius | Accession | 25/11/1930 | |
| Montserrat | Accession | 25/11/1930 | |
| New Hebrides | Accession | 25/11/1930 | |
| Newfoundland (UK) | Accession | 10/05/1930 | |
| Nigeria | Accession | 25/11/1930 | |
| Northern Rhodesia | Accession | 25/11/1930 | |
| Nyasaland | Accession | 25/11/1930 | |
| Palestine | Accession | 25/11/1930 | |
| Sarawak | Accession | 25/11/1930 | |
| Seychelles | Accession | 25/11/1930 | |
| Sierra Leone | Accession | 25/11/1930 | |
| Somaliland Protectorate | Accession | 25/11/1930 | |
| South Africa | Accession | 25/11/1930 | |
| St Helena | Accession | 25/11/1929 | |
| Straits Settlements | Accession | 25/11/1930 | |
| Tanganyika | Accession | 25/11/1930 | |
| The Gambia | Accession | 25/11/1930 | |
| Tonga | Accession | 25/11/1930 | |
| Transjordan | Accession | 25/11/1930 | |
| Trinidad And Tobago | Accession | 25/11/1930 | |
| Uganda | Accession | 25/11/1930 | |
| UNITED KINGDOM | Signature | 25/01/1929 | |
| Weihaiwei | Accession | 25/11/1930 | |
| Western Pacific High Commsn Territories | Accession | 25/11/1930 | |
| Windward Islands | Accession | 25/11/1930 |