| Country | Action | Action Date | Effective Date |
|---|
| Aden Colony | Extension | 16/03/1948 | |
| Aden Colony | Extension | 16/03/1948 | 31/03/1948 |
| BAHAMAS | Extension | 30/06/1948 | |
| BAHAMAS | Extension | 30/06/1948 | 21/09/1948 |
| Barbados | Extension | 16/03/1948 | |
| Barbados | Extension | 16/03/1948 | 31/03/1948 |
| Bermuda | Extension | 16/03/1948 | |
| Bermuda | Extension | 16/03/1948 | 31/03/1948 |
| British Guiana | Extension | 16/03/1948 | |
| British Guiana | Extension | 16/03/1948 | 31/03/1948 |
| British Honduras | Extension | 16/03/1948 | |
| British Honduras | Extension | 16/03/1948 | 31/03/1948 |
| CYPRUS | Extension | 16/03/1948 | |
| CYPRUS | Extension | 16/03/1948 | 31/03/1948 |
| FIJI | Extension | 16/03/1948 | |
| FIJI | Extension | 16/03/1948 | 31/03/1949 |
| Gibraltar | Extension | 16/03/1948 | |
| Gibraltar | Extension | 16/03/1948 | 31/03/1948 |
| Gold Coast | Extension | 16/03/1948 | |
| Gold Coast | Extension | 16/03/1948 | 31/03/1948 |
| Hong Kong | Extension | 16/03/1949 | |
| Hong Kong | Extension | 16/03/1949 | 26/03/1949 |
| ITALY | Signature | 04/01/1923 | |
| ITALY | Ratification | 06/12/1923 | |
| JAMAICA | Extension | 16/03/1948 | |
| JAMAICA | Extension | 16/03/1948 | 31/03/1948 |
| KENYA | Extension | 16/03/1948 | |
| KENYA | Extension | 16/03/1948 | 31/03/1948 |
| Leeward Islands | Extension | 16/03/1948 | |
| Leeward Islands | Extension | 16/03/1948 | 31/03/1948 |
| Malay States, Federated | Extension | 16/03/1949 | 26/03/1949 |
| Malaya | Extension | 16/03/1949 | |
| MALTA | Extension | 16/03/1948 | |
| MALTA | Extension | 16/03/1948 | 31/03/1948 |
| MAURITIUS | Extension | 16/03/1948 | |
| MAURITIUS | Extension | 16/03/1948 | 31/03/1948 |
| Montserrat | Extension | 16/03/1948 | |
| Montserrat | Extension | 16/03/1948 | 31/03/1948 |
| NIGERIA | Extension | 16/03/1948 | |
| NIGERIA | Extension | 16/03/1948 | 31/03/1948 |
| Northern Rhodesia | Extension | 16/03/1948 | |
| Northern Rhodesia | Extension | 16/03/1948 | 31/03/1948 |
| Nyasaland | Extension | 16/03/1948 | |
| Nyasaland | Extension | 16/03/1948 | 31/03/1948 |
| SIERRA LEONE | Extension | 16/03/1948 | |
| SIERRA LEONE | Extension | 16/03/1948 | 31/03/1948 |
| SINGAPORE | Extension | 16/03/1948 | |
| SINGAPORE | Extension | 16/03/1948 | 31/03/1948 |
| Somaliland Protectorate | Extension | 21/11/1949 | |
| Somaliland Protectorate | Extension | 21/11/1949 | 30/11/1949 |
| Southern Rhodesia | Extension | 30/06/1948 | |
| Southern Rhodesia | Extension | 30/06/1948 | 21/09/1949 |
| SWAZILAND | Extension | 16/03/1948 | |
| SWAZILAND | Extension | 16/03/1948 | 31/03/1948 |
| Tanganyika | Extension | 16/03/1949 | |
| Tanganyika | Extension | 16/03/1949 | 26/03/1949 |
| TRINIDAD AND TOBAGO | Extension | 16/03/1948 | |
| TRINIDAD AND TOBAGO | Extension | 16/03/1948 | 31/03/1948 |
| UGANDA | Extension | 16/03/1948 | |
| UGANDA | Extension | 16/03/1948 | 31/03/1948 |
| UNITED KINGDOM | Signature | 04/01/1923 | |
| UNITED KINGDOM | Ratification | 12/07/1923 | |
| Zanzibar | Extension | 16/03/1948 | |
| Zanzibar | Extension | 16/03/1948 | 31/03/1948 |