| Country | Action | Action Date | Effective Date |
|---|
| Antilles | Extension | 01/01/1986 | |
| Aruba | Extension | 01/01/1986 | |
| AUSTRALIA | Signature | 12/04/1930 | |
| AUSTRALIA | Ratification | 10/11/1937 | |
| AUSTRIA | Signature | 12/04/1930 | |
| BELGIUM | Signature | 12/04/1930 | |
| BELGIUM | Ratification | 04/04/1939 | |
| BRAZIL | Accession | 19/09/1931 | |
| BRAZIL | Reservation | 19/09/1931 | |
| BURMA | Succession | 23/04/1940 | 01/04/1937 |
| Canada | Extension | 06/04/1934 | |
| CANADA | Denunciation | 15/05/1996 | 15/05/1997 |
| CHILE | Signature | 12/04/1930 | |
| CHINA | Signature | 12/04/1930 | |
| CHINA | Ratification | 14/02/1935 | |
| COLOMBIA | Signature | 12/04/1930 | |
| COLOMBIA | Reservation | 12/04/1930 | |
| CUBA | Signature | 12/04/1930 | |
| CUBA | Reservation | 12/04/1930 | |
| CYPRUS | Succession | 27/03/1970 | |
| CZECHOSLOVAKIA | Signature | 12/04/1930 | |
| DANZIG | Signature | 12/04/1930 | |
| DENMARK | Signature | 12/04/1930 | |
| DENMARK | Reservation | 12/04/1930 | |
| EGYPT | Signature | 12/04/1930 | |
| ESTONIA | Signature | 12/04/1930 | |
| FIJI | Succession | 12/06/1972 | |
| FRANCE | Signature | 12/04/1930 | |
| GERMANY | Signature | 12/04/1930 | |
| GREECE | Signature | 12/04/1930 | |
| HUNGARY | Signature | 12/04/1930 | |
| ICELAND | Signature | 12/04/1930 | |
| INDIA | Signature | 12/04/1930 | |
| INDIA | Ratification | 07/10/1935 | |
| INDIA | Declaration | 07/10/1935 | |
| IRELAND, REPUBLIC OF | Signature | 12/04/1930 | |
| ITALY | Signature | 12/04/1930 | |
| JAPAN | Signature | 12/04/1930 | |
| JAPAN | Reservation | 12/04/1930 | |
| KIRIBATI | Succession | 29/11/1983 | |
| LATVIA | Signature | 12/04/1930 | |
| LESOTHO | Succession | 04/11/1974 | 02/02/1975 |
| LESOTHO | Reservation | 04/11/1974 | 02/02/1975 |
| LIBERIA | Accession | 16/09/2005 | 15/12/2005 |
| LUXEMBOURG | Signature | 12/04/1930 | |
| MALTA | Succession | 16/08/1966 | 21/09/1964 |
| MALTA | Declaration | 16/08/1966 | |
| MAURITIUS | Succession | | 12/03/1968 |
| MEXICO | Signature | 12/04/1930 | |
| MEXICO | Reservation | 12/04/1930 | |
| MONACO | Accession | 27/04/1931 | |
| NETHERLANDS THE | Signature | 12/04/1930 | |
| NETHERLANDS THE | Ratification | 02/04/1937 | |
| NETHERLANDS THE | Declaration | 01/01/1986 | |
| Norfolk Island | Extension | 10/11/1937 | |
| NORWAY | Accession | 16/03/1931 | |
| PAKISTAN | Succession | 29/07/1953 | |
| Papua | Extension | 10/11/1937 | |
| PERU | Signature | 12/04/1930 | |
| PERU | Reservation | 12/04/1930 | |
| POLAND | Signature | 12/04/1930 | |
| POLAND | Ratification | 15/06/1934 | |
| PORTUGAL | Signature | 12/04/1930 | |
| SALVADOR | Signature | 12/04/1930 | |
| SOUTH AFRICA | Signature | 12/04/1930 | |
| SPAIN | Signature | 12/04/1930 | |
| SWAZILAND | Accession | 18/09/1970 | 17/12/1970 |
| SWEDEN | Signature | 12/04/1930 | |
| SWEDEN | Ratification | 06/07/1933 | |
| SWEDEN | Declaration | 06/07/1933 | |
| SWITZERLAND | Signature | 12/04/1930 | |
| SWITZERLAND | Reservation | 12/04/1930 | |
| UNITED KINGDOM | Signature | 12/04/1930 | |
| UNITED KINGDOM | Ratification | 06/04/1934 | |
| UNITED KINGDOM | Notification | 10/06/1997 | |
| URUGUAY | Signature | 12/04/1930 | |
| YUGOSLAVIA | Signature | 12/04/1930 | |
| ZIMBABWE | Succession | 01/12/1998 | 18/04/1980 |