| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| Antilles | Extension | 08/07/1936 | 08/01/1937 |
| ARGENTINE REPUBLIC | Accession | 19/04/1961 | 19/10/1961 |
| Aruba | Extension | 01/01/1986 | 01/01/1986 |
| BELGIUM | Signature | 10/04/1926 | |
| BELGIUM | Ratification | 08/01/1936 | 08/01/1937 |
| BRAZIL | Signature | 10/04/1926 | |
| BRAZIL | Ratification | 08/01/1936 | 08/01/1937 |
| CHILE | Signature | 10/04/1926 | |
| CHILE | Ratification | 08/01/1936 | |
| CONGO, DEMOCRATIC REPUBLIC OF | Accession | 17/07/1967 | 17/01/1968 |
| Curacao | Extension | 08/07/1936 | 08/01/1937 |
| CYPRUS | Accession | 19/07/1988 | 19/01/1989 |
| DENMARK | Signature | 10/04/1926 | |
| DENMARK | Ratification | 16/11/1950 | 16/05/1951 |
| East Indies | Extension | 08/07/1936 | 08/01/1937 |
| ESTONIA | Signature | 10/04/1926 | |
| ESTONIA | Ratification | 08/01/1936 | 08/01/1937 |
| FRANCE | Signature | 10/04/1926 | |
| FRANCE | Ratification | 27/07/1955 | 27/01/1956 |
| GERMANY | Signature | 10/04/1926 | |
| GERMANY | Ratification | 27/06/1936 | 08/01/1937 |
| GERMANY | Declaration | 01/11/1953 | |
| GREECE | Signature | 19/05/1951 | |
| Guernsey, Bailiwick of | Extension | 19/11/1987 | 19/05/1988 |
| HUNGARY | Signature | 10/04/1926 | |
| HUNGARY | Ratification | 08/01/1936 | 08/01/1937 |
| Isle of Man | Extension | 19/11/1987 | 19/05/1988 |
| ITALY | Signature | 10/04/1926 | |
| ITALY | Ratification | 27/01/1937 | 27/07/1937 |
| Jersey, Bailiwick of | Extension | 19/11/1987 | 19/05/1988 |
| LUXEMBOURG | Accession | 18/08/1991 | 18/02/1991 |
| Madagascar And Dependencies | Extension | 27/07/1955 | 27/01/1956 |
| MALAGASY REPUBLIC | Succession | 13/07/1965 | |
| MEXICO | Signature | 10/04/1926 | |
| NETHERLANDS THE | Signature | 10/04/1926 | |
| NETHERLANDS THE | Ratification | 08/07/1936 | 08/01/1937 |
| NETHERLANDS THE | Declaration | 01/01/1986 | 01/01/1986 |
| NORWAY | Signature | 10/04/1926 | |
| NORWAY | Ratification | 25/04/1939 | 25/10/1939 |
| POLAND | Signature | 10/04/1926 | |
| POLAND | Ratification | 08/01/1936 | 08/07/1937 |
| POLAND | Denunciation | 17/03/1952 | 12/03/1953 |
| POLAND | Re-Application | 16/07/1976 | 16/01/1977 |
| PORTUGAL | Signature | 13/01/1927 | |
| PORTUGAL | Ratification | 27/06/1938 | 27/12/1938 |
| ROUMANIA | Signature | 10/04/1926 | |
| ROUMANIA | Ratification | 04/08/1937 | |
| ROUMANIA | Denunciation | 21/09/1959 | 21/09/1960 |
| SERB-CROAT-SLOVENE STATE | Signature | 10/04/1926 | |
| SPAIN | Signature | 10/04/1926 | |
| Surinam | Extension | 08/07/1936 | 08/01/1937 |
| SWEDEN | Signature | 10/04/1926 | |
| SWEDEN | Ratification | 01/07/1938 | 01/01/1939 |
| SWITZERLAND | Accession | 28/05/1954 | |
| SYRIA | Succession | 04/10/1962 | 17/08/1960 |
| TURKEY | Accession | 04/07/1956 | 04/01/1957 |
| UNITED ARAB REPUBLIC | Accession | 17/02/1960 | 17/08/1960 |
| UNITED KINGDOM | Signature | 10/04/1926 | |
| UNITED KINGDOM | Ratification | 03/07/1979 | 03/01/1980 |
| UNITED KINGDOM | Reservation | 03/07/1979 | |
| UNITED KINGDOM | Statement | 03/07/1979 | |
| UNITED KINGDOM | Extension | 19/11/1987 | 19/05/1988 |
| URUGUAY | Accession | 15/09/1970 | 15/03/1971 |