| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| Bahamas | Accession | 10/06/1930 | |
| Barbados | Accession | 10/06/1930 | |
| Bermuda | Accession | 10/06/1930 | |
| British Guiana | Accession | 10/06/1930 | |
| British Honduras | Accession | 10/06/1930 | |
| Ceylon | Accession | 10/06/1930 | |
| Cyprus | Accession | 10/06/1930 | |
| Falkland Island Dependencies | Accession | 10/06/1930 | |
| Gold Coast | Accession | 10/06/1930 | |
| Hong Kong | Accession | 10/06/1930 | |
| JAMAICA | Accession | 10/06/1930 | |
| KENYA | Accession | 01/06/1937 | |
| Leeward Islands | Accession | 10/06/1930 | |
| Malta | Accession | 10/06/1930 | |
| Mauritius | Accession | 10/06/1930 | |
| Nigeria | Accession | 10/06/1930 | |
| North Borneo | Accession | 10/06/1930 | |
| Palestine | Accession | 02/09/1932 | |
| PANAMA | |||
| Sierra Leone | Accession | 10/06/1930 | |
| St Helena And Ascension | Accession | 10/06/1930 | |
| Straits Settlements | Accession | 10/06/1930 | |
| Tanganyika | Accession | 20/08/1931 | |
| Trinidad And Tobago | Accession | 10/06/1930 | |
| UGANDA | Accession | 01/06/1937 | |
| UNITED KINGDOM | Signature | 25/09/1928 | |
| UNITED KINGDOM | Ratification | 22/02/1929 | |
| Windward Islands | Accession | 10/06/1930 |