| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| AFGHANISTAN | Accession | 29/01/1957 | |
| ALBANIA | Signature | 19/02/1925 | |
| ALGERIA | Accession | 31/10/1963 | |
| Antilles | Extension | 01/01/1986 | |
| ARGENTINE REPUBLIC | Accession | 09/07/1931 | |
| Aruba | Extension | 01/01/1986 | |
| Australia | Signature | 11/09/1925 | |
| Australia | Ratification | 17/02/1926 | |
| AUSTRIA | Signature | 19/02/1925 | |
| AUSTRIA | Reservation | 30/09/1925 | |
| AUSTRIA | Withdrawn | 27/05/1926 | |
| AUSTRIA | Ratification | 25/11/1927 | |
| Bahamas | Extension | 20/10/1926 | |
| BAHAMAS | Succession | 13/08/1975 | |
| Belgian Congo | Extension | 17/12/1941 | |
| BELGIUM | Signature | 19/02/1925 | |
| BELGIUM | Ratification | 24/08/1927 | |
| BOLIVIA | Accession | 19/01/1927 | |
| BRAZIL | Signature | 19/02/1925 | |
| BRAZIL | Ratification | 10/06/1932 | |
| BRITISH EMPIRE | Signature | 19/02/1925 | |
| BRITISH EMPIRE | Ratification | 17/02/1926 | |
| BULGARIA | Signature | 19/02/1925 | |
| BULGARIA | Ratification | 09/03/1927 | |
| Burma | Extension | 01/04/1937 | |
| CAMBODIA | Application | 03/10/1951 | |
| CAMEROON | Succession | 20/11/1961 | |
| Canada | Signature | 19/02/1925 | |
| Canada | Ratification | 27/06/1928 | |
| CENTRAL AFRICAN REPUBLIC | Succession | 04/09/1962 | |
| CEYLON | Succession | 04/12/1957 | |
| CHILE | Signature | 19/02/1925 | |
| CHILE | Ratification | 11/04/1933 | |
| COLOMBIA | Accession | 03/12/1930 | |
| CONGO, REPUBLIC OF | Succession | 15/10/1962 | |
| COSTA RICA | Accession | 08/01/1935 | |
| CUBA | Signature | 06/07/1931 | |
| Curacao | Extension | 19/02/1925 | |
| CZECH REPUBLIC | Succession | 30/12/1993 | 01/01/1993 |
| CZECHOSLOVAKIA | Signature | 19/02/1925 | |
| CZECHOSLOVAKIA | Ratification | 11/04/1927 | |
| DAHOMEY | Succession | 05/12/1961 | |
| DANZIG | Accession | 07/08/1926 | |
| DENMARK | Signature | 19/02/1925 | |
| DENMARK | Ratification | 23/04/1930 | |
| DOMINICAN REPUBLIC | Accession | 19/07/1928 | |
| East Indies | Extension | 19/02/1925 | |
| ECUADOR | Accession | 23/10/1934 | |
| EGYPT | Accession | 16/03/1926 | |
| ESTONIA | Accession | 30/08/1930 | |
| ETHIOPIA | Accession | 09/09/1947 | |
| FIJI | Succession | 01/11/1971 | |
| FINLAND | Accession | 05/12/1927 | |
| FRANCE | Signature | 19/02/1925 | |
| FRANCE | Reservation | 19/02/1925 | |
| FRANCE | Ratification | 02/07/1927 | |
| GERMAN DEMOCRATIC REPUBLIC | Succession | 21/11/1957 | |
| GERMAN DEMOCRATIC REPUBLIC | Re-Application | 31/01/1974 | 07/04/1958 |
| GERMANY | Signature | 19/02/1925 | |
| GERMANY | Reservation | 19/02/1925 | |
| GERMANY | Ratification | 15/08/1929 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 30/01/1953 | 01/01/1953 |
| GERMANY FEDERAL REPUBLIC | Re-Application | 27/11/1953 | 01/10/1953 |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/01/1954 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 02/02/1954 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 15/06/1954 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/07/1954 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 20/07/1955 | |
| GERMANY FEDERAL REPUBLIC | Non-acceptance | 16/03/1976 | |
| GHANA | Succession | 07/04/1958 | |
| GREECE | Signature | 19/02/1925 | |
| GREECE | Ratification | 10/12/1929 | |
| HAYTI | Accession | 30/11/1938 | |
| HONDURAS | Accession | 21/09/1934 | |
| HUNGARY | Signature | 19/02/1925 | |
| HUNGARY | Ratification | 27/08/1930 | |
| India | Signature | 19/02/1925 | |
| India | Ratification | 17/02/1926 | |
| INDONESIA | Accession | 03/04/1958 | |
| IRAQ | Accession | 08/08/1931 | |
| Irish Free State | Signature | 19/02/1925 | |
| Irish Free State | Ratification | 01/09/1931 | |
| ISRAEL | Accession | 16/05/1952 | |
| ITALY | Accession | 17/09/1928 | |
| IVORY COAST | Succession | 08/12/1961 | |
| JAMAICA | Succession | 26/12/1963 | |
| JAPAN | Signature | 19/02/1925 | |
| JAPAN | Ratification | 10/10/1928 | |
| JORDAN | Accession | 07/05/1958 | |
| LAOS | Application | 07/10/1950 | |
| LATVIA | Signature | 19/02/1925 | |
| LATVIA | Ratification | 31/10/1928 | |
| LESOTHO | Succession | 04/11/1974 | |
| LITHUANIA | Accession | 13/02/1931 | |
| LUXEMBOURG | Signature | 19/02/1925 | |
| LUXEMBOURG | Ratification | 27/03/1928 | |
| MALAWI | Succession | 22/07/1965 | |
| MALAYA | Succession | 31/08/1957 | |
| MAURITIUS | Succession | 18/07/1969 | 12/03/1968 |
| MONACO | Accession | 09/02/1927 | |
| MOROCCO | Succession | 07/11/1956 | |
| NETHERLANDS THE | Signature | 19/02/1925 | |
| NETHERLANDS THE | Ratification | 04/06/1928 | |
| New Hebrides | Declaration | 24/12/1927 | |
| New Zealand | Signature | 19/02/1925 | |
| New Zealand | Ratification | 17/02/1926 | |
| NICARAGUA | Signature | 19/02/1925 | |
| NIGER | Succession | 25/08/1961 | |
| NIGERIA | Succession | 26/06/1961 | |
| NORWAY | Accession | 16/03/1931 | |
| PAPUA NEW GUINEA | Succession | 28/10/1980 | |
| PARAGUAY | Accession | 25/06/1941 | |
| PERSIA | Signature | 19/02/1925 | |
| POLAND | Signature | 19/02/1925 | |
| POLAND | Ratification | 16/06/1927 | |
| PORTUGAL | Signature | 19/02/1925 | |
| PORTUGAL | Ratification | 13/09/1926 | |
| ROUMANIA | Accession | 26/03/1926 | |
| Ruanda Urundi | Extension | 17/12/1941 | |
| RWANDA | Succession | 05/08/1964 | |
| SALVADOR | Accession | 11/03/1926 | |
| SAN MARINO | Accession | 21/04/1926 | |
| Sarawak | Extension | 11/03/1926 | |
| SENEGAL | Succession | 02/05/1963 | |
| SERB-CROAT-SLOVENE STATE | Signature | 19/02/1925 | |
| SERB-CROAT-SLOVENE STATE | Ratification | 04/09/1929 | |
| SIAM | Signature | 19/02/1925 | |
| SIAM | Ratification | 11/10/1929 | |
| SIERRA LEONE | Succession | 13/03/1962 | |
| South Africa | Signature | 19/02/1925 | |
| South Africa | Ratification | 17/02/1926 | |
| SOVIET UNION | Accession | 31/10/1935 | |
| SPAIN | Signature | 19/02/1925 | |
| SPAIN | Ratification | 22/06/1928 | |
| SPAIN | Accession | 19/04/1930 | |
| SUDAN | Signature | 19/02/1925 | |
| SUDAN | Ratification | 20/02/1926 | |
| Surinam | Extension | 19/02/1925 | |
| SWEDEN | Accession | 06/12/1930 | |
| SWITZERLAND | Signature | 19/02/1925 | |
| SWITZERLAND | Ratification | 03/04/1929 | |
| TOGO | Succession | 27/02/1962 | |
| TONGA | Succession | 05/09/1973 | 04/06/1970 |
| TRINIDAD AND TOBAGO | Succession | 11/04/1966 | 31/08/1962 |
| TURKEY | Accession | 03/04/1933 | |
| UGANDA | Succession | 20/10/1965 | 18/01/1966 |
| UNITED KINGDOM | Signature | 19/02/1925 | |
| UNITED KINGDOM | Ratification | 17/02/1926 | |
| UPPER VOLTA | Accession | 26/04/1963 | |
| URUGUAY | Signature | 19/02/1925 | |
| URUGUAY | Ratification | 11/09/1930 | |
| VENEZUELA | Accession | 25/06/1927 | |
| VIETNAM | Application | 11/08/1950 | |
| West Indies | Extension | 19/02/1925 | |
| Western Samoa | Extension | 11/09/1925 | |
| ZAMBIA | Succession | 09/04/1973 | 24/10/1964 |