| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| Aden Colony | Extension | 01/04/1937 | |
| Ascension Island | Extension | 01/10/1931 | |
| AUSTRALIA | Accession | 18/01/1935 | |
| AUSTRALIA | Declaration | 29/07/1936 | |
| AUSTRALIA | Declaration | 18/03/1965 | |
| AUSTRIA | Accession | 19/07/1936 | |
| Bahamas | Extension | 01/10/1931 | |
| Barbados | Extension | 01/10/1931 | |
| Basutoland | Extension | 01/10/1931 | |
| Bechuanaland | Extension | 01/10/1931 | |
| Belgian Congo | Extension | 02/11/1948 | |
| BELGIUM | Accession | 07/10/1934 | |
| BELGIUM | Declaration | 02/11/1948 | |
| Bermuda | Extension | 01/10/1931 | |
| BHUTAN | Accession | 25/08/2004 | 25/11/2004 |
| BRAZIL | Accession | 01/06/1933 | |
| British Guiana | Extension | 01/10/1931 | |
| British Honduras | Extension | 01/10/1931 | |
| British Solomon Islands | Extension | 01/10/1931 | |
| BULGARIA | Signature | 02/06/1928 | |
| BULGARIA | Ratification | 28/05/1931 | 01/08/1931 |
| Burma | Extension | 01/04/1937 | |
| CANADA | Signature | 02/06/1928 | |
| CANADA | Ratification | 27/06/1931 | 01/08/1931 |
| Ceylon | Extension | 01/10/1931 | |
| Cook Islands | Extension | 18/03/1965 | |
| Cyprus | Extension | 01/10/1931 | |
| CYPRUS | Succession | 24/04/1964 | |
| CYPRUS | Communication | 29/05/1968 | |
| CYPRUS | Communication | 10/09/1968 | |
| CZECHOSLOVAKIA | Accession | 30/11/1936 | |
| DANZIG | Signature | 02/06/1928 | |
| DANZIG | Ratification | 30/06/1931 | |
| DENMARK | Accession | 16/09/1933 | |
| ESTONIA | Signature | 02/06/1928 | |
| Falkland Islands | Extension | 01/10/1931 | |
| Fiji | Extension | 01/10/1931 | |
| FINLAND | Signature | 02/06/1928 | |
| FINLAND | Ratification | 01/07/1931 | 01/08/1931 |
| FRANCE | Accession | 22/12/1933 | |
| GERMAN DEMOCRATIC REPUBLIC | Declaration | 11/05/1955 | |
| GERMANY | Accession | 21/10/1933 | |
| GERMANY FEDERAL REPUBLIC | Declaration | 01/01/1905 | |
| GERMANY FEDERAL REPUBLIC | Declaration | 07/02/1950 | |
| Gibraltar | Extension | 01/10/1931 | |
| Gilbert & Ellice Colony | Extension | 01/10/1931 | |
| Gold Coast | Extension | 01/10/1931 | |
| GREECE | Accession | 25/02/1932 | |
| GREECE | Declaration | 25/02/1932 | |
| Hong Kong | Extension | 01/10/1931 | |
| HUNGARY | Signature | 02/06/1928 | |
| HUNGARY | Ratification | 25/06/1931 | |
| ICELAND | Accession | 07/09/1947 | |
| INDIA | Signature | 02/06/1928 | |
| INDIA | Ratification | 30/06/1931 | 01/08/1931 |
| INDONESIA | Denunciation | 19/02/1959 | |
| Irish Free State | Extension | 11/06/1935 | |
| Irish Free State | Reservation | 11/06/1935 | |
| ISRAEL | Accession | 24/03/1950 | |
| ITALY | Signature | 02/06/1928 | |
| ITALY | Ratification | 27/06/1931 | |
| Jamaica | Extension | 01/10/1931 | |
| JAPAN | Signature | 02/06/1928 | |
| JAPAN | Ratification | 10/07/1931 | 01/08/1931 |
| JAPAN | Notification | 14/03/1974 | |
| JORDAN | Withdrawal | 01/01/1905 | |
| Kenya | Extension | 01/10/1931 | |
| LATVIA | Accession | 15/05/1937 | |
| LATVIA | Reservation | 15/05/1937 | |
| Leeward Islands | Extension | 01/10/1931 | |
| LIECHTENSTEIN | Accession | 30/08/1931 | |
| LUXEMBOURG | Accession | 04/02/1932 | |
| Malay States, Federated | Extension | 10/01/1933 | |
| MALTA | Succession | 21/09/1964 | |
| Malta | Extension | 01/10/1931 | |
| Mauritius | Extension | 01/10/1931 | |
| MONACO | Accession | 09/06/1933 | |
| Morocco | Extension | 25/11/1934 | |
| Morocco | Extension | 08/12/1934 | |
| Nauru | Extension | 29/07/1936 | |
| NETHERLANDS THE | Signature | 02/06/1928 | |
| NETHERLANDS THE | Ratification | 27/06/1931 | 01/08/1931 |
| NETHERLANDS THE | Extension | 02/07/1959 | |
| New Guinea | Extension | 20/07/1936 | |
| NEW ZEALAND | Accession | 04/12/1947 | |
| NEW ZEALAND | Declaration | 18/03/1965 | |
| Newfoundland (UK) | Extension | 11/12/1933 | |
| Nigeria | Extension | 01/10/1931 | |
| Norfolk Island | Extension | 29/07/1936 | |
| North Borneo | Extension | 01/01/1939 | |
| Northern Rhodesia | Extension | 01/10/1931 | |
| NORWAY | Signature | 02/06/1928 | |
| NORWAY | Ratification | 30/06/1931 | 01/08/1931 |
| Nyasaland | Extension | 01/10/1931 | |
| PAKISTAN | Succession | 05/07/1948 | |
| Palestine | Extension | 01/10/1931 | |
| Papua | Extension | 29/07/1936 | |
| POLAND | Accession | 21/11/1935 | |
| POLAND | Declaration | 01/01/1982 | |
| PORTUGAL | Accession | 29/07/1937 | |
| ROUMANIA | Accession | 06/08/1936 | |
| Ruanda Urundi | Extension | 02/01/1948 | |
| Sarawak | Extension | 01/01/1939 | |
| Seychelles | Extension | 01/10/1931 | |
| Sierra Leone | Extension | 01/10/1931 | |
| SLOVAK REPUBLIC | Accession | 24/06/1944 | |
| Somaliland Protectorate | Extension | 01/10/1931 | |
| South Africa | Extension | 27/05/1935 | |
| Southern Rhodesia | Extension | 31/08/1931 | |
| SPAIN | Accession | 23/04/1933 | |
| SPAIN | Declaration | 08/12/1934 | |
| Spanish Colonies | Extension | 08/12/1934 | |
| St Helena | Extension | 01/10/1931 | |
| Straits Settlements | Extension | 01/10/1931 | |
| Swaziland | Extension | 01/10/1931 | |
| SWEDEN | Signature | 02/06/1928 | |
| SWEDEN | Ratification | 27/06/1931 | 01/08/1931 |
| SWITZERLAND | Signature | 02/06/1928 | |
| SWITZERLAND | Ratification | 18/03/1931 | |
| SWITZERLAND | Declaration | 21/08/1957 | |
| SYRIA | Withdrawal | 12/01/1962 | |
| SYRIA & GRAND LEBANON | Accession | 24/12/1933 | |
| Tanganyika | Extension | 01/10/1931 | |
| The Gambia | Extension | 01/10/1931 | |
| Tokelau Islands | Extension | 18/03/1965 | |
| Trinidad And Tobago | Extension | 01/10/1931 | |
| TUNIS | Accession | 22/12/1933 | |
| TUNIS | Reservation | 22/12/1933 | |
| Uganda | Extension | 01/10/1931 | |
| UNITED KINGDOM | Signature | 02/06/1928 | |
| UNITED KINGDOM | Ratification | 27/06/1931 | |
| UNITED KINGDOM | Signature | 27/06/1931 | 01/08/1931 |
| UNITED KINGDOM | Declaration | 31/08/1931 | |
| UNITED KINGDOM | Declaration | 01/10/1931 | |
| UNITED KINGDOM | Declaration | 10/01/1933 | |
| UNITED KINGDOM | Declaration | 11/12/1933 | |
| UNITED KINGDOM | Declaration | 27/05/1935 | |
| UNITED KINGDOM | Declaration | 11/06/1935 | |
| UNITED KINGDOM | Declaration | 01/04/1937 | |
| UNITED KINGDOM | Declaration | 01/01/1939 | |
| VATICAN CITY | Accession | 12/09/1935 | |
| Western Samoa | Extension | 04/12/1947 | |
| Windward Islands | Extension | 01/10/1931 | |
| YUGOSLAVIA | Accession | 01/08/1931 | |
| YUGOSLAVIA | Reservation | 01/08/1931 | |
| ZIMBABWE | Succession | 18/04/1980 |