| Country | Action | Action Date | Effective Date |
|---|
| Anguilla | | | |
| Bahamas | Extension | 12/05/1927 | |
| Barbados | Extension | 12/05/1927 | |
| Bermuda | Extension | 12/05/1927 | |
| BOSNIA AND HERZEGOVINA | Succession | 01/10/1997 | |
| British Guiana | Extension | 12/05/1927 | |
| British Honduras | Extension | 12/05/1927 | |
| British Virgin Islands | | | |
| Ceylon | Extension | 12/05/1927 | |
| CROATIA | | | |
| Cyprus | Extension | 12/05/1927 | |
| Falkland Islands | Extension | 12/05/1927 | |
| Gold Coast | Extension | 12/05/1927 | |
| Hong Kong | Extension | 12/05/1927 | |
| Kenya | Extension | 07/04/1937 | |
| KOSOVO | Succession | 21/10/2009 | |
| Leeward Islands | Extension | 12/05/1927 | |
| Malta | Extension | 12/05/1927 | |
| Mauritius | Extension | 12/05/1927 | |
| Montserrat | | | |
| Nigeria | Extension | 12/05/1927 | |
| Palestine | Extension | 12/05/1927 | |
| SERB-CROAT-SLOVENE STATE | Signature | 12/05/1927 | |
| SERB-CROAT-SLOVENE STATE | Ratification | 09/02/1928 | |
| SERBIA AND MONTENEGRO | | | |
| Seychelles | Extension | 12/05/1927 | |
| SLOVENIA | Succession | 25/06/1991 | 26/06/1991 |
| SLOVENIA | Termination | 01/05/2004 | 01/01/1900 |
| Southern Rhodesia | Extension | 07/08/1928 | |
| St Helena And Ascension | Extension | 12/05/1927 | |
| Straits Settlements | Extension | 12/05/1927 | |
| Tanganyika | Extension | 31/03/1931 | |
| The Gambia | Extension | 12/05/1927 | |
| Uganda | Extension | 07/04/1937 | |
| UNITED KINGDOM | Signature | 12/05/1927 | |
| UNITED KINGDOM | Ratification | 15/01/1928 | |
| Windward Islands | Extension | 12/05/1927 | |
| YUGOSLAVIA | | | |