| Country | Action | Action Date | Effective Date |
|---|
| Aden Colony | Extension | 22/07/1939 | 22/07/1939 |
| Ascension Island | Extension | 25/11/1929 | 25/11/1929 |
| AUSTRALIA | Accession | 03/01/1933 | 03/01/1933 |
| BAHAMAS | Extension | 25/11/1929 | 25/11/1929 |
| Barbados | Extension | 25/11/1929 | 25/11/1929 |
| Basutoland | Extension | 14/04/1930 | 14/04/1930 |
| Bechuanaland | Extension | 14/04/1930 | 14/04/1930 |
| Bermuda | Extension | 14/04/1930 | 14/04/1930 |
| British Guiana | Extension | 25/11/1929 | 25/11/1929 |
| British Honduras | Extension | 25/11/1929 | 25/11/1929 |
| British Solomon Islands | Extension | 14/04/1930 | 14/04/1930 |
| Cameroons | Extension | 18/05/1932 | 18/05/1932 |
| CANADA | Accession | 01/08/1935 | 01/08/1935 |
| Cayman Islands | Extension | 25/11/1929 | 25/11/1929 |
| Ceylon | Extension | 25/11/1929 | 25/11/1929 |
| Channel Islands | Extension | 19/04/1935 | 19/04/1935 |
| CYPRUS | Extension | 25/11/1929 | 25/11/1929 |
| Falkland Island Dependencies | Extension | 25/11/1929 | 25/11/1929 |
| Falkland Islands | Extension | 25/11/1929 | 25/11/1929 |
| FIJI | Extension | 25/11/1929 | 25/11/1929 |
| GERMANY | Signature | 20/03/1928 | |
| GERMANY | Ratification | 04/02/1929 | |
| Gibraltar | Extension | 25/11/1929 | 25/11/1929 |
| Gilbert And Ellice Islands | Extension | 14/04/1930 | 14/04/1930 |
| Gold Coast | Extension | 25/11/1929 | 25/11/1929 |
| Hong Kong | Extension | 04/08/1930 | 04/08/1930 |
| Isle of Man | Extension | 19/04/1935 | 19/04/1935 |
| JAMAICA | Extension | 25/11/1929 | 25/11/1929 |
| KENYA | Extension | 25/11/1929 | 25/11/1929 |
| Leeward Islands | Extension | 25/11/1929 | 25/11/1929 |
| Malay States, Federated | Extension | 25/11/1929 | 25/11/1929 |
| Malay States, Unfederated | Extension | 25/11/1929 | 25/11/1929 |
| MALTA | Extension | 15/02/1931 | 15/02/1931 |
| MAURITIUS | Extension | 25/11/1929 | 25/11/1929 |
| NEW ZEALAND | Accession | 01/01/1930 | 01/01/1930 |
| Newfoundland (UK) | Accession | 14/10/1934 | 14/10/1934 |
| NIGERIA | Extension | 14/04/1930 | 14/04/1930 |
| North Borneo | Extension | 25/11/1929 | 25/11/1929 |
| Northern Ireland | Extension | 14/06/1929 | 14/06/1929 |
| Northern Rhodesia | Extension | 25/11/1929 | 25/11/1929 |
| Nyasaland | Extension | 25/11/1929 | 25/11/1929 |
| Palestine | Extension | 25/11/1929 | 25/11/1929 |
| Sarawak | Extension | 25/11/1929 | 25/11/1929 |
| Scotland | Extension | 06/12/1930 | 06/12/1930 |
| SEYCHELLES | Extension | 25/11/1929 | 25/11/1929 |
| SIERRA LEONE | Extension | 25/11/1929 | 25/11/1929 |
| Somaliland Protectorate | Extension | 25/11/1929 | 25/11/1929 |
| Southern Rhodesia | Accession | 08/05/1933 | 08/05/1933 |
| St Helena | Extension | 25/11/1929 | 25/11/1929 |
| Straits Settlements | Extension | 25/11/1929 | 25/11/1929 |
| SWAZILAND | Extension | 14/04/1930 | 14/04/1930 |
| Tanganyika | Extension | 25/11/1929 | 25/11/1929 |
| The Gambia | Extension | 25/11/1929 | 25/11/1929 |
| TONGA | Extension | 14/04/1930 | 14/04/1930 |
| TRINIDAD AND TOBAGO | Extension | 25/11/1929 | 25/11/1929 |
| Turks And Caicos Islands | Extension | 25/11/1929 | 25/11/1929 |
| UGANDA | Extension | 25/11/1929 | 25/11/1929 |
| UNITED KINGDOM | Signature | 20/03/1928 | |
| UNITED KINGDOM | Ratification | 21/12/1928 | |
| Windward Islands | Extension | 25/11/1929 | 25/11/1929 |
| Zanzibar | Extension | 25/11/1929 | 25/11/1929 |