| Country | Action | Action Date | Effective Date |
|---|
| AUSTRALIA | Accession | 08/07/1935 | |
| AUSTRIA | Signature | 12/04/1930 | |
| AUSTRIA | Ratification | 28/07/1958 | |
| BELGIUM | Signature | 12/04/1930 | |
| BELGIUM | Ratification | 04/04/1939 | |
| BRAZIL | Accession | 19/09/1931 | |
| BURMA | Succession | 23/04/1940 | 01/04/1937 |
| CANADA | Signature | 12/04/1930 | |
| CHILE | Signature | 12/04/1930 | |
| COLOMBIA | Signature | 12/04/1930 | |
| COLOMBIA | Ratification | 24/02/1937 | |
| CUBA | Signature | 12/04/1930 | |
| CUBA | Ratification | 22/10/1936 | |
| CUBA | Reservation | 22/10/1936 | |
| CYPRUS | Succession | 27/03/1970 | |
| DENMARK | Signature | 12/03/1930 | |
| EGYPT | Signature | 12/04/1930 | |
| FIJI | Succession | 12/06/1972 | |
| FRANCE | Signature | 12/04/1930 | |
| GERMANY | Signature | 12/04/1930 | |
| GREECE | Signature | 12/04/1930 | |
| INDIA | Signature | 12/04/1930 | |
| INDIA | Ratification | 28/09/1932 | |
| INDIA | Declaration | 28/09/1932 | |
| IRELAND, REPUBLIC OF | Signature | 12/04/1930 | |
| KIRIBATI | Succession | 29/11/1983 | |
| LESOTHO | Succession | 04/11/1974 | |
| LIBERIA | Accession | 16/09/2005 | 15/12/2005 |
| LUXEMBOURG | Signature | 12/04/1930 | |
| MALAWI | Accession | 13/10/1966 | |
| MALTA | Succession | 16/08/1966 | 21/09/1964 |
| MAURITANIA | Accession | 02/03/1966 | |
| 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 | 25/07/1966 | 23/10/1966 |
| NIGERIA | Accession | 17/03/1967 | 15/06/1967 |
| PERU | Signature | 12/04/1930 | |
| PORTUGAL | Signature | 12/04/1930 | |
| SALVADOR | Signature | 12/04/1930 | |
| SALVADOR | Ratification | 14/10/1935 | |
| SOUTH AFRICA | Accession | 09/10/1935 | |
| SOUTH AFRICA | Reservation | 09/10/1935 | |
| SPAIN | Signature | 12/04/1930 | |
| SWAZILAND | Accession | 18/09/1970 | 17/12/1970 |
| SWEDEN | Signature | 12/04/1930 | |
| SWEDEN | Ratification | 06/07/1933 | |
| UNITED KINGDOM | Signature | 12/04/1930 | |
| UNITED KINGDOM | Ratification | 14/01/1932 | |
| UNITED KINGDOM | Notification | 10/06/1997 | 01/07/1997 |
| UNITED STATES OF AMERICA | Signature | 12/04/1930 | |
| UNITED STATES OF AMERICA | Ratification | 03/08/1932 | |
| URUGUAY | Signature | 12/04/1930 | |
| ZIMBABWE | Succession | 01/12/1998 | 18/04/1980 |