| Country | Action | Action Date | Effective Date |
|---|
| ALGERIA | Accession | 13/04/1964 | |
| Anguilla | Extension | 02/06/1931 | |
| Antigua | Accession | | 02/06/1931 |
| ARGENTINA | Accession | 19/04/1961 | |
| AUSTRALIA | Accession | 04/07/1955 | |
| AUSTRALIA | Reservation | 04/07/1955 | |
| AUSTRALIA | Denunciation | 16/07/1992 | 16/07/1993 |
| BAHAMAS | Accession | | 02/06/1931 |
| BARBADOS | Accession | | 02/06/1931 |
| BELGIUM | Signature | 08/09/1924 | |
| BELGIUM | Ratification | 02/06/1930 | |
| Bermuda | Accession | | 02/06/1931 |
| Bermuda | Denunciation | 20/10/1983 | 20/10/1984 |
| BOLIVIA | Accession | 28/05/1982 | 28/08/1982 |
| British Antarctic Territory | Denunciation | 20/10/1983 | 20/10/1984 |
| British Guiana | Accession | | 02/06/1931 |
| British Honduras | Accession | | 02/06/1931 |
| British Solomon Islands | Accession | | 02/06/1931 |
| British Virgin Islands | Accession | | 02/06/1931 |
| British Virgin Islands | Denunciation | 20/10/1983 | 20/10/1984 |
| Cayman Islands | Accession | | 02/06/1931 |
| Cayman Islands | Denunciation | 20/10/1983 | 20/10/1984 |
| CEYLON | Accession | | 02/06/1931 |
| CHILE | Signature | 28/10/1927 | |
| CROATIA | Succession | 30/07/1992 | 08/10/1991 |
| CUBA | Accession | 25/07/1977 | 25/01/1977 |
| CYPRUS | Accession | | 02/06/1931 |
| DENMARK | Accession | 01/07/1938 | |
| DENMARK | Reservation | 01/07/1938 | |
| DENMARK | Denunciation | 01/03/1984 | 01/03/1985 |
| DOMINICA, COMMONWEALTH OF | Accession | | 02/06/1931 |
| ECUADOR | Accession | 23/03/1979 | 23/09/1979 |
| EGYPT | Accession | | 19/05/1944 |
| ESTONIA | Signature | 10/04/1926 | |
| Falkland Island Dependencies | Accession | | 02/06/1931 |
| Falkland Island Dependencies | Denunciation | 20/10/1983 | 20/10/1984 |
| Falkland Islands | Accession | | 02/06/1931 |
| Falkland Islands | Denunciation | 20/10/1983 | 20/10/1984 |
| FIJI | Accession | | 02/06/1931 |
| FIJI | Accession | 22/08/1972 | |
| FINLAND | Accession | 01/07/1939 | |
| FINLAND | Denunciation | 01/03/1984 | 01/03/1985 |
| FRANCE | Signature | 28/02/1925 | |
| FRANCE | Ratification | 04/01/1937 | |
| GEORGIA | Accession | 20/02/1996 | 20/05/1996 |
| GERMANY | Signature | 24/08/1925 | |
| GERMANY | Ratification | 01/07/1939 | |
| GERMANY | Reservation | 01/07/1939 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | | 01/01/1953 |
| GERMANY FEDERAL REPUBLIC | Re-Application | | 01/11/1953 |
| GERMANY FEDERAL REPUBLIC | Re-Application | | 01/10/1953 |
| Gibraltar | Accession | | 02/06/1931 |
| Gibraltar | Denunciation | 22/09/1977 | 22/09/1978 |
| Gilbert And Ellice Islands | Accession | | 02/06/1931 |
| Gold Coast | Accession | | 02/06/1931 |
| GRENADA | Accession | | 02/06/1931 |
| Hong Kong | Accession | | 02/06/1931 |
| Hong Kong | Denunciation | 20/10/1983 | 20/10/1984 |
| HONG KONG SAR | Application | 04/06/1997 | 01/07/1997 |
| HUNGARY | Signature | 08/04/1926 | |
| HUNGARY | Ratification | 02/06/1930 | |
| IRAN | Accession | 26/04/1966 | |
| IRELAND, REPUBLIC OF | Accession | | 30/07/1962 |
| ISRAEL | Accession | 05/09/1959 | |
| ITALY | Signature | 17/09/1925 | |
| ITALY | Ratification | 07/10/1938 | |
| ITALY | Denunciation | 22/11/1984 | 22/11/1985 |
| IVORY COAST | Accession | | 15/06/1962 |
| JAMAICA | Accession | | 02/06/1931 |
| JAPAN | Signature | 25/08/1925 | |
| JAPAN | Ratification | 01/07/1957 | |
| JAPAN | Denunciation | 01/06/1992 | 01/06/1993 |
| KENYA | Accession | | 02/06/1931 |
| KUWAIT | Accession | 25/07/1969 | |
| KUWAIT | Reservation | 25/07/1969 | |
| LATVIA | Accession | 04/04/2002 | 04/10/2002 |
| LEBANON | Accession | 19/07/1975 | 19/01/1975 |
| LITHUANIA | Accession | 02/12/2003 | 02/06/2004 |
| LUXEMBOURG | Accession | 18/02/1991 | 18/08/1991 |
| MADAGASCAR | Accession | 13/07/1965 | |
| Malay States | Accession | | 02/06/1931 |
| MAURITIUS | Accession | | 02/06/1931 |
| MAURITIUS | Accession | 24/08/1970 | 12/03/1968 |
| MONACO | Accession | 15/05/1931 | |
| Montserrat | Accession | | 02/06/1931 |
| Montserrat | Denunciation | 20/10/1983 | 20/10/1984 |
| NETHERLANDS THE | Accession | 18/08/1956 | |
| NETHERLANDS THE | Declaration | 18/08/1956 | |
| NETHERLANDS THE | Denunciation | 26/04/1982 | 26/04/1983 |
| NIGERIA | Accession | | 02/06/1931 |
| North Borneo | Accession | | 02/06/1931 |
| NORWAY | Accession | 01/07/1938 | |
| NORWAY | Denunciation | 01/03/1984 | 01/03/1985 |
| Palestine | Accession | | 02/06/1931 |
| PARAGUAY | Accession | 22/11/1967 | |
| PERU | Accession | 29/10/1964 | |
| POLAND | Signature | 22/08/1925 | |
| POLAND | Ratification | 26/10/1936 | |
| PORTUGAL | Accession | 25/12/1931 | |
| PORTUGAL | Communication | 23/09/1999 | |
| ROMANIA | Signature | 12/03/1925 | |
| ROMANIA | Ratification | 04/08/1937 | |
| ROMANIA | Denunciation | 21/03/2002 | 21/03/2003 |
| Sarawak | Accession | 03/11/1931 | 03/05/1932 |
| SENEGAL | Accession | 14/02/1978 | 14/08/1978 |
| SEYCHELLES | Accession | | 02/06/1931 |
| SIERRA LEONE | Accession | | 02/06/1931 |
| SINGAPORE | Accession | 18/06/1974 | |
| SLOVENIA | Succession | 15/05/1996 | 25/06/1991 |
| SOLOMON ISLANDS | Succession | 17/09/1981 | 07/07/1978 |
| Somaliland Protectorate | Accession | | 02/06/1931 |
| SPAIN | Signature | 24/08/1925 | |
| SPAIN | Ratification | 02/06/1930 | |
| SPAIN | Denunciation | 07/10/2011 | |
| St Christopher, Nevis | Accession | | 02/06/1931 |
| St Helena And Ascension | Accession | 03/11/1931 | 03/05/1932 |
| St Lucia | Accession | | 02/06/1931 |
| St Vincent | Accession | | 02/06/1931 |
| St Vincent | Denunciation | 22/07/2002 | 22/07/2003 |
| Straits Settlements | Accession | | 02/06/1931 |
| SWEDEN | Accession | 01/07/1938 | |
| SWEDEN | Reservation | 01/07/1938 | |
| SWEDEN | Denunciation | 01/03/1984 | 01/03/1985 |
| SWITZERLAND | Accession | 28/05/1954 | |
| SWITZERLAND | Reservation | 28/05/1954 | |
| SYRIA | Accession | 01/08/1974 | 01/02/1974 |
| Tanganyika | Accession | | 02/06/1931 |
| TANZANIA | Accession | 03/12/1962 | |
| The Gambia | Accession | | 02/06/1931 |
| TONGA | Accession | | 02/06/1931 |
| TONGA | Succession | 13/06/1978 | |
| TRINIDAD AND TOBAGO | Accession | | 02/06/1931 |
| TURKEY | Accession | 04/07/1955 | |
| Turks And Caicos Islands | Accession | | 02/06/1931 |
| Turks And Caicos Islands | Denunciation | 20/10/1983 | 20/10/1984 |
| UNITED KINGDOM | Signature | 15/11/1924 | |
| UNITED KINGDOM | Declaration | 15/11/1924 | |
| UNITED KINGDOM | Ratification | 02/06/1930 | |
| UNITED KINGDOM | Denunciation | 13/06/1977 | 13/06/1978 |
| UNITED KINGDOM | Denunciation | 20/10/1983 | 20/10/1984 |
| UNITED STATES OF AMERICA | Signature | 23/06/1925 | |
| UNITED STATES OF AMERICA | Ratification | 29/06/1937 | |
| UNITED STATES OF AMERICA | Reservation | 29/06/1937 | |
| YUGOSLAVIA | Signature | 10/04/1926 | |
| YUGOSLAVIA | Ratification | 17/04/1959 | |
| ZAIRE | Accession | 17/07/1967 | |
| Zanzibar | Accession | | 02/06/1931 |