| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| Antigua | Accession | 07/06/1929 | |
| Bahamas | Accession | 07/06/1929 | |
| Barbados | Accession | 07/06/1929 | |
| Bermuda | Accession | 07/06/1929 | |
| British Guiana | Accession | 07/07/1929 | |
| British Honduras | Accession | 07/06/1929 | |
| British Virgin Islands | Accession | 07/06/1929 | |
| Cameroons | Accession | 07/06/1929 | |
| Cameroons | Withdrawal | 16/05/1933 | 16/05/1933 |
| Cayman Islands | Accession | 07/06/1929 | |
| Ceylon | Accession | 07/06/1929 | |
| Cyprus | Accession | 07/06/1929 | |
| Dominica | Accession | 07/06/1929 | |
| Falkland Islands | Accession | 07/06/1929 | |
| Gold Coast | Accession | 07/06/1929 | |
| Gold Coast | Withdrawal | 16/05/1933 | 16/05/1934 |
| Hong Kong | Accession | 07/06/1929 | |
| Jamaica | Accession | 07/06/1929 | |
| JAPAN | |||
| Kenya | Accession | 07/06/1929 | |
| Leeward Islands | Accession | 07/06/1929 | |
| Malay States, Federated | Accession | 07/06/1929 | |
| Malta | Accession | 07/06/1929 | |
| Mauritius | Accession | 07/06/1929 | |
| Montserrat | Accession | 07/06/1929 | |
| Nigeria | Accession | 07/06/1929 | |
| Nigeria | Withdrawal | 16/05/1933 | 16/05/1934 |
| Northern Rhodesia | Accession | 07/06/1929 | |
| Nyasaland | Accession | 07/06/1929 | |
| Palestine | Accession | 01/06/1930 | |
| Seychelles | Accession | 05/08/1929 | |
| Sierra Leone | Accession | 07/06/1929 | |
| Sierra Leone | Withdrawal | 16/05/1933 | 16/05/1934 |
| Somaliland | Accession | 07/06/1929 | |
| St Helena And Ascension | Accession | 07/06/1929 | |
| St. Christopher And Nevis | Accession | 07/06/1929 | |
| Straits Settlements | Accession | 07/06/1929 | |
| Tanganyika | Accession | 07/06/1929 | |
| The Gambia | Accession | 07/01/1929 | |
| The Gambia | Withdrawal | 16/05/1933 | 16/05/1934 |
| Togoland | Accession | 07/06/1929 | |
| Togoland | Withdrawal | 16/05/1933 | 16/05/1934 |
| Trinidad And Tobago | Accession | 07/06/1929 | |
| Turks And Caicos Islands | Accession | 07/06/1929 | |
| Uganda | Accession | 07/06/1929 | |
| UNITED KINGDOM | Signature | 30/07/1925 | |
| UNITED KINGDOM | Ratification | 06/04/1927 | |
| Windward Islands | Accession | 07/06/1929 |