| Country | Action | Action Date | Effective Date |
|---|
| ALBANIA | Signature | 20/04/1921 | |
| ALBANIA | Ratification | 18/10/1921 | |
| AUSTRIA | Accession | 15/11/1923 | |
| Bahamas | Extension | 02/08/1922 | |
| Barbados | Extension | 02/08/1922 | |
| BELGIUM | Signature | 20/04/1921 | |
| British Guiana | Extension | 02/08/1922 | |
| British Solomon Islands | Extension | 02/08/1922 | |
| Ceylon | Extension | 02/08/1922 | |
| CHILE | Signature | 20/04/1921 | |
| Cyprus | Extension | 02/08/1922 | |
| CZECHOSLOVAKIA | Signature | 20/04/1921 | |
| DENMARK | Signature | 20/04/1921 | |
| DENMARK | Ratification | 13/11/1922 | |
| Fiji | Extension | 02/08/1922 | |
| FIJI | Succession | 15/03/1972 | |
| FINLAND | Signature | 20/04/1921 | |
| FINLAND | Ratification | 29/01/1923 | |
| Gibraltar | Extension | 02/08/1922 | |
| Gilbert And Ellice Islands | Extension | 02/08/1922 | |
| Gold Coast | Extension | 02/08/1922 | |
| GREECE | Signature | 20/04/1921 | |
| Hong Kong | Extension | 02/08/1922 | |
| HUNGARY | Accession | 18/05/1928 | |
| INDIA | Signature | 20/04/1921 | |
| INDIA | Ratification | 02/08/1922 | |
| Jamaica | Extension | 02/08/1922 | |
| Kenya | Extension | 02/08/1922 | |
| Leeward Islands | Extension | 02/08/1922 | |
| LUXEMBOURG | Accession | 19/03/1930 | |
| Malay States, Federated | Extension | 02/09/1923 | |
| Malay States, Unfederated | Extension | 02/09/1923 | |
| Malta | Extension | 02/08/1922 | |
| MALTA | Succession | 13/05/1966 | 21/09/1964 |
| Mauritius | Extension | 02/08/1922 | |
| NEW ZEALAND | Signature | 20/04/1921 | |
| NEW ZEALAND | Ratification | 02/08/1922 | |
| Newfoundland (UK) | Extension | 02/08/1922 | |
| Nigeria | Extension | 02/08/1922 | |
| NORWAY | Signature | 20/04/1921 | |
| NORWAY | Ratification | 04/09/1923 | |
| Nyasaland | Extension | 02/08/1922 | |
| Nyasaland | Termination | 21/03/1969 | |
| PORTUGAL | Signature | 20/04/1921 | |
| ROUMANIA | Ratification | 09/05/1924 | |
| ROUMANIA | Reservation | 09/05/1924 | |
| Seychelles | Extension | 02/08/1922 | |
| SIAM | Accession | 29/11/1922 | |
| Sierra Leone | Extension | 02/08/1922 | |
| SPAIN | Signature | 20/04/1921 | |
| St Helena | Extension | 02/08/1922 | |
| ST VINCENT AND THE GRENADINES | Succession | 05/09/2001 | 27/10/1979 |
| Straits Settlements | Extension | 02/08/1922 | |
| SWEDEN | Signature | 20/04/1921 | |
| SWEDEN | Ratification | 15/09/1927 | |
| Tanganyika | Extension | 02/08/1922 | |
| The Gambia | Extension | 02/08/1922 | |
| Tonga | Extension | 02/08/1922 | |
| Trinidad And Tobago | Extension | 02/08/1922 | |
| TURKEY | Accession | 27/06/1933 | |
| Uganda | Extension | 02/08/1922 | |
| UNITED KINGDOM | Signature | 20/04/1921 | |
| UNITED KINGDOM | Ratification | 02/08/1922 | |
| Windward Islands | Extension | 02/08/1922 | |
| Zanzibar | Extension | 02/08/1922 | |