| Country | Action | Action Date | Effective Date |
|---|
| ANGOLA | Succession | 04/06/1976 | |
| ARGENTINE REPUBLIC | Ratification | 30/11/1933 | |
| AUSTRIA | Ratification | 12/06/1924 | |
| BANGLADESH | Ratification | 22/06/1972 | |
| BANGLADESH | Declaration | 22/06/1972 | |
| BELGIUM | Ratification | 06/09/1926 | |
| BOLIVIA | Ratification | 15/11/1973 | |
| BULGARIA | Ratification | 14/02/1922 | |
| BURUNDI | Ratification | 30/07/1971 | |
| CANADA | Ratification | 21/03/1935 | |
| CHILE | Ratification | 15/09/1925 | |
| CHINA | Declaration | 20/10/1999 | |
| COLOMBIA | Ratification | 20/06/1933 | |
| COMOROS | Succession | 23/10/1978 | 23/10/1978 |
| COSTA RICA | Ratification | 01/03/1982 | |
| CUBA | Ratification | 20/09/1934 | |
| CZECH REPUBLIC | Succession | 01/01/1993 | 01/01/1993 |
| CZECHOSLOVAKIA | Ratification | 24/08/1921 | |
| DJIBOUTI | Succession | 03/08/1978 | 03/08/1978 |
| DOMINICAN REPUBLIC | Ratification | 04/02/1933 | |
| EGYPT | Ratification | 10/05/1960 | |
| EQUATORIAL GUINEA | Succession | 12/06/1985 | 12/06/1985 |
| FRANCE | Ratification | 02/06/1927 | |
| FRANCE | Declaration | 02/06/1927 | |
| FRANCE | Declaration | 27/11/1974 | |
| GHANA | Ratification | 19/06/1973 | |
| GREECE | Ratification | 19/11/1920 | |
| GUINEA BISSAU | Succession | 21/02/1977 | |
| HAITI | Ratification | 31/03/1952 | |
| INDIA | Ratification | 14/07/1921 | |
| IRAQ | Ratification | 24/08/1965 | |
| ISRAEL | Ratification | 26/06/1951 | |
| ITALY | Ratification | 06/10/1924 | |
| ITALY | Declaration | 06/10/1924 | |
| KUWAIT | Ratification | 21/09/1961 | |
| LATVIA | Ratification | 15/08/1925 | |
| LATVIA | Declaration | 15/08/1925 | |
| LATVIA | Succession | 15/08/1994 | 15/08/1994 |
| LEBANON | Ratification | 01/06/1977 | 01/06/1978 |
| LIBYA | Ratification | 27/05/1971 | |
| LITHUANIA | Ratification | 19/06/1931 | |
| LUXEMBOURG | Ratification | 16/04/1928 | |
| MOZAMBIQUE | Ratification | 06/06/1977 | 06/06/1978 |
| NEW ZEALAND | Ratification | 29/03/1938 | |
| NICARAGUA | Ratification | 12/04/1934 | |
| Pakistan | Extension | 14/07/1921 | |
| PARAGUAY | Ratification | 21/03/1966 | |
| PERU | Ratification | 08/11/1945 | |
| PORTUGAL | Ratification | 03/07/1928 | |
| PORTUGAL | Declaration | 04/10/1999 | |
| ROMANIA | Ratification | 13/06/1921 | |
| SAUDI ARABIA | Ratification | 15/06/1978 | 15/06/1978 |
| SLOVAK REPUBLIC | Succession | 01/01/1993 | 01/01/1993 |
| SPAIN | Ratification | 22/02/1929 | |
| SPAIN | Declaration | 22/02/1929 | |
| SPAIN | Withdrawal Res. | 01/10/1931 | |
| SYRIA | Ratification | 30/10/1961 | |
| SYRIA | Declaration | 30/10/1961 | |
| UNITED ARAB EMIRATES | Ratification | 27/05/1982 | |
| UNITED KINGDOM | | | |
| URUGUAY | Ratification | 06/06/1933 | |
| VENEZUELA | Ratification | 20/11/1944 | |