| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| AUSTRALIA | Signature | 12/04/1930 | |
| AUSTRALIA | Ratification | 08/07/1935 | |
| BELGIUM | Signature | 12/04/1930 | |
| BRAZIL | Accession | 19/09/1931 | |
| BURMA | Succession | 23/04/1940 | 01/04/1937 |
| CANADA | Signature | 12/04/1930 | |
| CHILE | Signature | 12/04/1930 | |
| CHILE | Ratification | 20/03/1935 | |
| CHINA | Signature | 12/04/1930 | |
| CHINA | Ratification | 14/02/1935 | |
| COLOMBIA | Signature | 12/04/1930 | |
| CUBA | Signature | 12/04/1930 | |
| CYPRUS | Succession | 03/04/1978 | |
| CZECHOSLOVAKIA | Signature | 12/04/1930 | |
| DANZIG | Signature | 12/04/1930 | |
| DENMARK | Signature | 12/04/1930 | |
| EGYPT | Signature | 12/04/1930 | |
| ESTONIA | Signature | 12/04/1930 | |
| FIJI | Succession | 12/06/1972 | |
| FRANCE | Signature | 12/04/1930 | |
| GREECE | Signature | 12/04/1930 | |
| INDIA | Signature | 12/04/1930 | |
| INDIA | Ratification | 28/09/1932 | |
| INDIA | Reservation | 28/09/1932 | |
| IRELAND, REPUBLIC OF | Signature | 12/04/1930 | |
| JAMAICA | Accession | 12/06/1968 | |
| JAPAN | Signature | 12/04/1930 | |
| KIRIBATI | Succession | 29/11/1983 | |
| LATVIA | Signature | 12/04/1930 | |
| LESOTHO | Succession | 04/11/1974 | |
| LUXEMBOURG | Signature | 12/04/1930 | |
| MACEDONIA THE FYR OF | Succession | 18/01/1994 | 17/09/1991 |
| MALAWI | Accession | 11/07/1967 | |
| MALTA | Succession | 21/09/1964 | 21/09/1964 |
| MAURITIUS | Succession | 12/03/1968 | |
| MEXICO | Signature | 12/04/1930 | |
| NETHERLANDS THE | Signature | 12/04/1930 | |
| NETHERLANDS THE | Ratification | 02/04/1937 | |
| NETHERLANDS THE | Declaration | 01/01/1986 | 01/01/1986 |
| NIGER | Accession | 18/07/1968 | |
| PAKISTAN | Succession | 29/07/1953 | |
| PERU | Signature | 12/04/1930 | |
| POLAND | Signature | 12/04/1930 | |
| POLAND | Ratification | 15/06/1934 | |
| PORTUGAL | Signature | 12/04/1930 | |
| SALVADOR | Accession | 14/10/1935 | |
| SOUTH AFRICA | Signature | 12/04/1930 | |
| SOUTH AFRICA | Ratification | 09/04/1936 | |
| SPAIN | Signature | 12/04/1930 | |
| UNITED KINGDOM | Signature | 12/04/1930 | |
| UNITED KINGDOM | Ratification | 14/01/1932 | |
| UNITED KINGDOM | Notification | 10/06/1997 | 01/07/1997 |
| URUGUAY | Signature | 12/04/1930 | |
| YUGOSLAVIA | Accession | 15/12/1959 | |
| YUGOSLAVIA, FEDERAL REPUBLIC OF | Succession | 12/03/2001 | 27/04/1992 |
| ZIMBABWE | Succession | 01/12/1998 | 18/04/1980 |