| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| ALGERIA | Accession | 19/10/1962 | |
| ANGOLA | Succession | 04/06/1976 | |
| ARGENTINA | Accession | 24/09/1956 | |
| AUSTRALIA | Signature | 10/06/1925 | |
| AUSTRALIA | Ratification | 22/04/1959 | |
| AUSTRALIA | Extension | 08/02/1961 | |
| AUSTRALIA | Declaration | 08/02/1996 | 08/02/1996 |
| AUSTRIA | Signature | 10/06/1925 | |
| AUSTRIA | Ratification | 29/09/1928 | |
| BANGLADESH | Accession | 22/06/1972 | |
| BELGIUM | Signature | 10/06/1925 | |
| BELGIUM | Ratification | 03/10/1927 | |
| BENIN | Accession | 12/12/1960 | |
| BOSNIA AND HERZEGOVINA | Accession | 02/06/1993 | 02/06/1993 |
| BULGARIA | Signature | 10/06/1925 | |
| BULGARIA | Ratification | 05/09/1929 | |
| BURMA | Succession | 18/05/1948 | 30/09/1927 |
| BURUNDI | Accession | 11/03/1963 | |
| CENTRAL AFRICAN REPUBLIC | Accession | 09/06/1964 | |
| CHILE | Signature | 10/06/1925 | |
| CHILE | Ratification | 31/05/1933 | |
| CHILE | Denunciation | 08/08/2000 | 08/08/2001 |
| CHINA | Declaration | 20/10/1999 | |
| COLOMBIA | Signature | 10/06/1925 | |
| COLOMBIA | Ratification | 20/06/1933 | |
| COMOROS | Succession | 23/10/1978 | |
| CUBA | Signature | 10/06/1925 | |
| CUBA | Ratification | 06/08/1928 | |
| CZECH REPUBLIC | Succession | 01/01/1993 | 01/01/1993 |
| CZECHOSLOVAKIA | Signature | 10/06/1925 | |
| CZECHOSLOVAKIA | Ratification | 19/09/1932 | |
| DENMARK | Signature | 10/06/1925 | |
| DENMARK | Ratification | 18/06/1934 | |
| DJIBOUTI | Succession | 03/08/1978 | 03/08/1978 |
| EGYPT | Accession | 10/05/1960 | |
| FINLAND | Signature | 10/06/1925 | |
| FINLAND | Ratification | 17/09/1927 | |
| FRANCE | Signature | 10/06/1925 | |
| FRANCE | Ratification | 13/08/1931 | |
| FRANCE | Declaration | 27/11/1974 | |
| GERMANY | Signature | 10/06/1925 | |
| GERMANY | Ratification | 18/09/1928 | |
| GUINEA | Accession | 21/01/1959 | |
| GUINEA BISSAU | Succession | 21/02/1977 | |
| HUNGARY | Signature | 10/06/1925 | |
| HUNGARY | Ratification | 18/04/1928 | |
| India | Extension | 30/09/1927 | |
| IRAQ | Signature | 10/06/1925 | |
| IRAQ | Ratification | 26/11/1938 | |
| IRELAND, REPUBLIC OF | Signature | 10/06/1925 | |
| IRELAND, REPUBLIC OF | Ratification | 25/11/1927 | |
| IRELAND, REPUBLIC OF | Denunciation | 09/06/1969 | |
| ITALY | Signature | 10/06/1925 | |
| ITALY | Ratification | 22/01/1934 | |
| IVORY COAST | Accession | 21/11/1960 | |
| JAPAN | Signature | 10/06/1925 | |
| JAPAN | Ratification | 08/10/1928 | |
| LATVIA | Signature | 10/06/1925 | |
| LATVIA | Ratification | 29/11/1929 | |
| LUXEMBOURG | Signature | 10/06/1925 | |
| LUXEMBOURG | Ratification | 16/04/1928 | |
| MALI | Accession | 22/09/1960 | |
| MAURITANIA | Accession | 20/06/1961 | |
| MOROCCO | Accession | 20/09/1956 | |
| MOZAMBIQUE | Accession | 06/06/1977 | 06/06/1978 |
| Nauru | Extension | 08/02/1961 | |
| NETHERLANDS THE | Signature | 10/06/1925 | |
| NETHERLANDS THE | Ratification | 01/11/1928 | |
| NETHERLANDS THE | Denunciation | 01/09/1939 | |
| New Guinea | Extension | 08/02/1961 | |
| NICARAGUA | Signature | 10/06/1925 | |
| NICARAGUA | Ratification | 12/04/1934 | |
| NIGER | Accession | 27/02/1961 | |
| Norfolk Island | Extension | 08/02/1996 | 08/02/1996 |
| NORWAY | Signature | 10/06/1925 | |
| NORWAY | Ratification | 11/06/1929 | |
| PAKISTAN | Succession | 31/10/1947 | 30/09/1927 |
| Papua | Extension | 08/02/1961 | |
| PAPUA NEW GUINEA | Succession | 01/05/1976 | |
| POLAND | Signature | 10/06/1925 | |
| POLAND | Ratification | 03/11/1937 | |
| PORTUGAL | Signature | 10/06/1925 | |
| PORTUGAL | Ratification | 27/03/1929 | |
| PORTUGAL | Reservation | 27/03/1929 | |
| PORTUGAL | Declaration | 04/10/1999 | |
| RWANDA | Accession | 18/09/1962 | |
| SAO TOME AND PRINCIPE | Accession | 01/06/1982 | |
| SENEGAL | Accession | 04/11/1960 | |
| SENEGAL | Denunciation | 10/05/1971 | 10/05/1972 |
| SLOVAK REPUBLIC | Succession | 01/01/1993 | 01/01/1993 |
| SLOVENIA | Accession | 09/06/1992 | 09/06/1992 |
| SPAIN | Signature | 10/06/1925 | |
| SPAIN | Ratification | 29/09/1932 | |
| SRI LANKA | Accession | 17/05/1952 | |
| SWEDEN | Signature | 10/06/1925 | |
| SWEDEN | Ratification | 15/10/1929 | |
| SWEDEN | Denunciation | 24/02/1937 | |
| SWITZERLAND | Signature | 10/01/1925 | |
| SWITZERLAND | Ratification | 16/11/1927 | |
| SYRIA | Accession | 30/10/1961 | |
| TUNISIA | Accession | 12/01/1959 | |
| UNITED KINGDOM | Signature | 10/06/1925 | |
| UNITED KINGDOM | Ratification | 17/09/1926 | |
| UNITED KINGDOM | Ratification | 06/10/1926 | |
| UNITED KINGDOM | Extension | 30/09/1927 | |
| UNITED KINGDOM | Denunciation | 29/04/1936 | |
| UPPER VOLTA | Accession | 21/11/1960 | |
| URUGUAY | Signature | 10/06/1925 | |
| URUGUAY | Ratification | 06/06/1933 | |
| URUGUAY | Denunciation | 17/10/1955 | |
| YUGOSLAVIA | Signature | 10/06/1925 | |
| YUGOSLAVIA | Ratification | 01/04/1927 | |
| YUGOSLAVIA, FEDERAL REPUBLIC OF | Ratification | 24/11/2000 | 24/11/2000 |
| ZAIRE | Accession | 20/09/1960 | |
| ZAMBIA | Accession | 22/02/1965 | 22/02/1965 |