| Country | Action | Action Date | Effective Date |
|---|
| Bermuda | Accession | 24/08/1979 | |
| Ceylon | Accession | 01/03/1927 | |
| Cyprus | Accession | 04/03/1927 | |
| Falkland Islands | Accession | 04/07/1927 | |
| Gold Coast | Accession | 22/09/1923 | |
| GREECE | | | |
| Jamaica | Accession | 24/03/1930 | |
| Kenya | Accession | 02/08/1933 | |
| Leeward Islands | Accession | 10/05/1927 | |
| Malta | Accession | 04/03/1927 | |
| Mauritius | Accession | 08/03/1927 | |
| Nigeria | Accession | 22/09/1928 | |
| North Borneo | Accession | 12/02/1929 | |
| Northern Rhodesia | Accession | 07/03/1934 | |
| Nyasaland | Accession | 10/08/1931 | |
| Palestine | Accession | 23/03/1927 | |
| Palestine | Reservation | 23/03/1927 | |
| Seychelles | Accession | 16/04/1927 | |
| Sierra Leone | Accession | 22/09/1928 | |
| Somaliland | Accession | 13/10/1933 | |
| St Helena | Accession | 10/05/1927 | |
| Straits Settlements | Accession | 01/03/1927 | |
| Tanganyika | Accession | 08/06/1932 | |
| The Gambia | Accession | 23/03/1927 | |
| Trinidad And Tobago | Accession | 07/11/1930 | |
| Uganda | Accession | 05/08/1933 | |
| UNITED KINGDOM | Signature | 16/07/1926 | |
| UNITED KINGDOM | Ratification | 01/12/1926 | |
| Windward Islands | Accession | 01/03/1927 | |
| Zanzibar | Accession | 09/03/1936 | |