| Country | Action | Action Date | Effective Date |
|---|
| Antilles | Extension | 01/01/1986 | 01/01/1986 |
| Aruba | Extension | 01/01/1986 | 01/01/1986 |
| Ascension Island | Extension | 07/09/1938 | |
| Australia | Extension | 03/09/1938 | |
| AUSTRIA | Signature | 19/03/1931 | |
| AUSTRIA | Ratification | 01/12/1958 | |
| Bahamas | Extension | 07/09/1938 | |
| BAHAMAS | Succession | 19/05/1976 | |
| Barbados | Extension | 18/07/1936 | |
| Basutoland | Extension | 18/07/1936 | |
| Bechuanaland Protectorate | Extension | 18/07/1936 | |
| BELGIUM | Signature | 19/03/1931 | |
| BELGIUM | Ratification | 18/12/1961 | |
| Bermuda | Extension | 18/07/1936 | |
| BRAZIL | Signature | 19/03/1931 | |
| BRAZIL | Accession | 26/08/1942 | |
| British Guiana | Extension | 18/07/1936 | |
| British Honduras | Extension | 18/07/1936 | |
| British Solomon Islands | Extension | 07/09/1938 | |
| Ceylon | Extension | 18/07/1936 | |
| Curacao | Extension | 30/09/1935 | |
| Cyprus | Extension | 18/07/1936 | |
| CYPRUS | Succession | 05/03/1968 | |
| CZECHOSLOVAKIA | Signature | 19/03/1931 | |
| DANZIG | Signature | 19/03/1931 | |
| DANZIG | Ratification | 24/06/1935 | |
| DENMARK | Signature | 19/03/1931 | |
| DENMARK | Ratification | 27/07/1932 | |
| DENMARK | Declaration | 27/07/1932 | |
| East Indies | Extension | 30/09/1935 | |
| ECUADOR | Signature | 19/03/1931 | |
| Falkland Islands | Extension | 07/09/1938 | |
| Fiji | Extension | 18/06/1936 | |
| FIJI | Succession | 25/03/1971 | |
| FINLAND | Signature | 19/03/1931 | |
| FINLAND | Ratification | 31/08/1932 | |
| FRANCE | Signature | 19/03/1931 | |
| FRANCE | Accession | 27/04/1936 | |
| GERMAN DEMOCRATIC REPUBLIC | Declaration | 01/01/1905 | |
| GERMAN DEMOCRATIC REPUBLIC | Re-Application | 06/06/1958 | |
| GERMANY | Signature | 19/03/1931 | |
| GERMANY | Ratification | 31/08/1933 | 03/10/1933 |
| GERMANY FEDERAL REPUBLIC | Declaration | 01/01/1905 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/01/1953 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 20/07/1955 | |
| Gibraltar | Extension | 18/07/1936 | |
| Gilbert And Ellice Islands | Extension | 07/09/1938 | |
| Gold Coast | Extension | 18/07/1936 | |
| GREECE | Signature | 19/03/1931 | |
| GREECE | Ratification | 01/06/1934 | |
| HUNGARY | Signature | 19/03/1931 | |
| HUNGARY | Reservation | 28/10/1964 | |
| INDONESIA | Succession | 09/03/1959 | |
| Irish Free State | Extension | 10/07/1936 | |
| ITALY | Signature | 19/03/1931 | |
| ITALY | Ratification | 31/08/1933 | |
| Jamaica | Extension | 03/08/1939 | |
| JAPAN | Signature | 19/03/1931 | |
| JAPAN | Ratification | 25/08/1933 | |
| Kenya | Extension | 18/07/1936 | |
| LIBERIA | Accession | 16/09/2005 | 15/12/2005 |
| LITHUANIA | Accession | 10/02/1997 | 11/05/1997 |
| LUXEMBOURG | Signature | 19/03/1931 | |
| LUXEMBOURG | Accession | 01/08/1968 | |
| Macao | Extension | 20/12/1999 | |
| Malay States, Federated | Extension | 18/07/1936 | |
| Malay States, Unfederated | Extension | 18/07/1936 | |
| MALAYSIA | Succession | 14/01/1960 | |
| Malta | Extension | 18/07/1936 | |
| MALTA | Succession | 06/12/1966 | |
| Mauritius | Extension | 07/09/1938 | |
| MEXICO | Signature | 19/03/1931 | |
| MONACO | Signature | 19/03/1931 | |
| MONACO | Ratification | 09/02/1933 | |
| NETHERLANDS THE | Signature | 19/03/1931 | |
| NETHERLANDS THE | Ratification | 02/04/1934 | |
| NETHERLANDS THE | Extension | 01/01/1986 | 01/01/1986 |
| New Hebrides | Extension | 16/03/1939 | |
| NICARAGUA | Accession | 16/03/1932 | |
| Northern Rhodesia | Extension | 18/07/1936 | |
| Northern Rhodesia | Re-Application | 20/07/1955 | |
| NORWAY | Signature | 19/03/1931 | |
| NORWAY | Ratification | 27/07/1932 | |
| Nyasaland | Extension | 18/07/1936 | |
| Nyasaland | Re-Application | 20/07/1955 | |
| Palestine | Extension | 18/07/1936 | |
| PAPUA NEW GUINEA | Accession | 12/02/1981 | 13/05/1981 |
| POLAND | Signature | 19/03/1931 | |
| POLAND | Accession | 19/12/1936 | |
| PORTUGAL | Signature | 19/03/1931 | |
| PORTUGAL | Ratification | 08/06/1934 | |
| PORTUGAL | Declaration | 16/11/1953 | |
| PORTUGAL | Communication | 29/09/1999 | |
| ROUMANIA | Signature | 19/03/1931 | |
| Seychelles | Extension | 18/07/1936 | |
| Sierra Leone | Extension | 18/07/1936 | |
| Somaliland Protectorate | Extension | 03/08/1939 | |
| SPAIN | Signature | 19/03/1931 | |
| St Helena | Extension | 07/09/1938 | |
| Straits Settlements | Extension | 18/07/1936 | |
| Surinam | Extension | 07/08/1936 | |
| Swaziland | Extension | 18/07/1936 | |
| SWEDEN | Signature | 19/03/1931 | |
| SWEDEN | Ratification | 27/07/1932 | |
| SWITZERLAND | Signature | 19/03/1931 | |
| SWITZERLAND | Ratification | 26/08/1932 | |
| Tanganyika | Extension | 07/09/1938 | |
| The Gambia | Extension | 18/07/1936 | |
| Tonga | Extension | 07/09/1938 | |
| TONGA | Succession | 02/02/1972 | |
| Transjordan | Extension | 07/09/1938 | |
| Trinidad And Tobago | Extension | 18/07/1936 | |
| TURKEY | Signature | 19/03/1931 | |
| Uganda | Extension | 18/07/1936 | |
| UNITED KINGDOM | Signature | 19/03/1931 | |
| UNITED KINGDOM | Ratification | 13/01/1932 | |
| UNITED KINGDOM | Declaration | 10/07/1936 | |
| UNITED KINGDOM | Declaration | 18/07/1936 | |
| UNITED KINGDOM | Declaration | 03/09/1938 | |
| UNITED KINGDOM | Declaration | 07/09/1938 | |
| UNITED KINGDOM | Declaration | 16/03/1939 | |
| UNITED KINGDOM | Declaration | 03/08/1939 | |
| Windward Islands | Extension | 18/07/1936 | |
| YUGOSLAVIA | Signature | 19/03/1931 | |
| Zanzibar | Extension | 07/09/1938 | |