| Country | Action | Action Date | Effective Date |
|---|
| AFGHANISTAN | Ratification | 12/06/1939 | |
| ALGERIA | Ratification | 19/10/1962 | |
| ANGOLA | Succession | 04/06/1976 | |
| Antigua | Extension | 27/03/1950 | |
| ANTIGUA AND BARBUDA | Succession | 02/02/1983 | |
| Antilles | Extension | 14/07/1965 | |
| ARGENTINA | Ratification | 26/05/1936 | |
| ARMENIA | Ratification | 27/01/2006 | 27/01/2007 |
| Aruba | Extension | 01/01/1986 | 01/01/1986 |
| Aruba | Declaration | 01/01/1986 | 01/01/1986 |
| AZERBAIJAN | Ratification | 19/05/1992 | 19/05/1992 |
| Bahamas | Extension | 27/03/1950 | |
| BAHAMAS | Succession | 25/05/1976 | |
| BAHRAIN | Ratification | 11/06/1981 | |
| BANGLADESH | Succession | 22/06/1972 | |
| Belgian Congo | Extension | 25/01/1956 | |
| BELGIUM | Ratification | 19/07/1926 | |
| BELIZE | Ratification | 22/06/1999 | 22/06/2000 |
| Bermuda | Extension | 27/03/1950 | |
| BOLIVIA | Ratification | 19/07/1954 | |
| BOSNIA AND HERZEGOVINA | Ratification | 02/06/1993 | 02/06/1993 |
| BOTSWANA | Ratification | 03/02/1988 | |
| BRAZIL | Ratification | 25/04/1957 | |
| British Virgin Islands | Extension | 27/03/1950 | |
| BULGARIA | Ratification | 06/03/1925 | |
| BURUNDI | Ratification | 11/03/1963 | |
| BYELORUSSIA S S R | Ratification | 26/02/1968 | |
| CAMEROON | Ratification | 07/06/1960 | |
| Canada | Ratification | 21/03/1935 | |
| CENTRAL AFRICAN REPUBLIC | Ratification | 27/10/1960 | |
| CHAD | Ratification | 10/11/1960 | |
| CHILE | Ratification | 15/09/1925 | |
| CHINA | Ratification | 17/05/1934 | |
| CHINA | Declaration | 20/10/1999 | |
| COLOMBIA | Ratification | 20/06/1933 | |
| COMOROS | Succession | 23/10/1978 | |
| CONGO, DEMOCRATIC REPUBLIC OF | Ratification | 20/09/1960 | |
| CONGO, REPUBLIC OF | Ratification | 10/11/1960 | |
| COSTA RICA | Ratification | 25/09/1984 | 25/09/1984 |
| CROATIA | Ratification | 08/10/1991 | |
| CUBA | Ratification | 20/07/1953 | |
| CZECH REPUBLIC | Succession | 01/01/1993 | 01/01/1993 |
| CZECHOSLOVAKIA | Ratification | 31/08/1923 | |
| DAHOMEY | Ratification | 12/12/1960 | |
| DENMARK | Ratification | 30/08/1935 | |
| DJIBOUTI | Succession | 03/08/1978 | 03/08/1978 |
| Dominica | Extension | 27/03/1950 | |
| DOMINICA, COMMONWEALTH OF | Succession | 28/02/1983 | |
| EQUATORIAL GUINEA | Ratification | 12/06/1985 | 12/06/1985 |
| ESTONIA | Ratification | 29/11/1923 | |
| ESTONIA | Declaration | 29/11/1923 | |
| ETHIOPIA | Ratification | 28/01/1991 | |
| Falkland Islands | Extension | 27/03/1950 | |
| FINLAND | Ratification | 19/06/1923 | |
| FRANCE | Ratification | 03/09/1926 | |
| FRANCE | Declaration | 19/03/1954 | |
| French Cameroons | Extension | 19/03/1954 | |
| French Cameroons | Extension | 03/09/1962 | |
| French Equatorial Africa | Extension | 19/03/1954 | |
| French India | Extension | 19/03/1954 | |
| French Oceania | Extension | 19/03/1954 | |
| French Somaliland | Extension | 19/03/1954 | |
| French Togoland | Extension | 19/03/1954 | |
| French West Africa | Extension | 19/03/1954 | |
| GABON | Ratification | 14/10/1960 | |
| GHANA | Ratification | 19/06/1973 | |
| Gibraltar | Extension | 27/03/1950 | |
| GREECE | Ratification | 11/05/1929 | |
| Greenland | Extension | 31/05/1954 | |
| Grenada | Extension | 27/03/1950 | |
| GRENADA | Succession | 09/07/1979 | |
| GUATEMALA | Ratification | 14/06/1988 | |
| GUINEA | Ratification | 21/01/1959 | |
| GUINEA BISSAU | Succession | 21/02/1977 | |
| HAITI | Ratification | 14/05/1952 | |
| HONDURAS | Ratification | 17/11/1964 | |
| Hong Kong | Extension | 27/03/1950 | |
| Hong Kong | Declaration | 23/01/1976 | |
| Hong Kong | Declaration | 26/01/1977 | |
| Hong Kong | Declaration | 11/02/1980 | |
| Hong Kong | Declaration | 09/04/1981 | |
| Hong Kong | Declaration | 07/04/1983 | |
| Hong Kong | Declaration | 27/04/1984 | 27/04/1984 |
| Hong Kong | Declaration | 27/02/1985 | 27/02/1985 |
| Hong Kong | Declaration | 06/03/1992 | 06/03/1992 |
| HONG KONG SAR | Notification | 18/05/1998 | 11/05/1999 |
| HUNGARY | Ratification | 08/06/1956 | |
| India | Extension | 11/05/1923 | |
| IRAN | Ratification | 10/06/1972 | |
| IRAQ | Ratification | 12/05/1960 | |
| Irish Free State | Extension | 22/07/1930 | |
| ISRAEL | Ratification | 26/06/1951 | |
| ITALY | Ratification | 08/09/1924 | |
| IVORY COAST | Ratification | 21/11/1960 | |
| KENYA | Ratification | 13/01/1964 | |
| KYRGYZSTAN | Succession | 31/03/1992 | 31/03/1992 |
| LATVIA | Ratification | 09/09/1924 | |
| LATVIA | Succession | 09/09/1924 | 09/09/1924 |
| LEBANON | Extension | 26/07/1962 | |
| LESOTHO | Ratification | 31/10/1966 | |
| LIBYA | Ratification | 27/05/1971 | |
| LITHUANIA | Ratification | 19/06/1931 | |
| LUXEMBOURG | Ratification | 16/04/1928 | |
| Madagascar | Extension | 19/03/1954 | |
| MALAGASY REPUBLIC | Ratification | 01/11/1960 | |
| MALAYSIA | Ratification | 03/03/1964 | |
| MALI | Ratification | 22/09/1960 | |
| MALTA | Ratification | 09/06/1988 | |
| MAURITANIA | Ratification | 08/11/1963 | |
| Mauritius | Extension | 27/03/1950 | |
| MAURITIUS | Succession | 02/12/1969 | |
| MEXICO | Ratification | 07/01/1938 | |
| Montserrat | Extension | 27/03/1950 | |
| MOROCCO | Ratification | 20/09/1956 | |
| MOZAMBIQUE | Ratification | 06/06/1977 | |
| MYANMAR | Ratification | 11/05/1923 | |
| NEPAL | Ratification | 10/12/1986 | |
| NETHERLANDS THE | Ratification | 14/07/1965 | |
| New Caledonia | Extension | 19/03/1954 | |
| New Zealand | Ratification | 29/03/1938 | |
| NICARAGUA | Ratification | 12/04/1934 | |
| NIGER | Ratification | 27/02/1961 | |
| Norfolk Island | Not Applicable | 15/06/1973 | |
| NORWAY | Ratification | 07/07/1937 | |
| PAKISTAN | Ratification | 11/05/1923 | |
| Papua New Guinea | Decision Resvd. | 15/06/1973 | |
| PARAGUAY | Ratification | 21/03/1966 | |
| PERU | Ratification | 08/11/1945 | |
| POLAND | Ratification | 21/06/1924 | |
| PORTUGAL | Ratification | 03/07/1928 | |
| PORTUGAL | Declaration | 04/10/1999 | |
| ROUMANIA | Ratification | 18/08/1923 | |
| Ruanda Urundi | Extension | 25/01/1956 | |
| RWANDA | Ratification | 18/09/1962 | |
| SAINT LUCIA | Succession | 14/05/1980 | 14/05/1980 |
| SAUDI ARABIA | Ratification | 15/06/1978 | |
| SENEGAL | Ratification | 04/11/1960 | |
| SERB-CROAT-SLOVENE STATE | Ratification | 01/04/1927 | |
| Singapore | Extension | 05/07/1962 | |
| SLOVAK REPUBLIC | Succession | 01/01/1993 | 01/01/1993 |
| SLOVENIA | Ratification | 29/05/1992 | |
| Solomon Islands | Extension | 27/03/1950 | |
| SOLOMON ISLANDS | Succession | 06/08/1985 | 06/08/1985 |
| Southern Rhodesia | Extension | 27/03/1950 | |
| SOVIET UNION | Ratification | 22/09/1967 | |
| SPAIN | Ratification | 20/06/1924 | |
| St Helena | Extension | 27/03/1950 | |
| St Kitts Nevis Anguilla | Extension | 27/03/1950 | |
| St Lucia | Extension | 27/03/1950 | |
| St Pierre and Miquelon | Extension | 19/03/1954 | |
| St Vincent | Extension | 27/03/1950 | |
| Surinam | Extension | 14/07/1965 | |
| SURINAME | Ratification | 15/06/1976 | |
| Swaziland | Extension | 27/03/1950 | |
| SWAZILAND | Succession | 26/04/1978 | |
| SWEDEN | Ratification | 22/12/1931 | |
| SWITZERLAND | Ratification | 16/01/1935 | |
| TAJIKISTAN | Succession | 26/11/1993 | 26/11/1993 |
| THAILAND | Ratification | 05/04/1968 | |
| TOGO | Ratification | 07/06/1960 | |
| TUNISIA | Ratification | 15/05/1957 | |
| TURKEY | Ratification | 27/12/1946 | |
| UKRAINE | Ratification | 19/06/1968 | |
| UNITED ARAB REPUBLIC | Ratification | 10/05/1960 | |
| UNITED KINGDOM | | | |
| UPPER VOLTA | Ratification | 21/11/1960 | |
| VENEZUELA | Ratification | 20/11/1944 | |
| VIETNAM | Ratification | 14/06/1955 | |
| VIETNAM, SOCIALIST REP OF | Ratification | 03/10/1994 | |
| VIETNAM, SOCIALIST REP OF | Ratification | 03/10/1994 | 03/10/1995 |
| YEMEN | Ratification | 29/07/1976 | |
| YUGOSLAVIA | Ratification | 01/04/1927 | |
| YUGOSLAVIA, FEDERAL REPUBLIC OF | Ratification | 24/11/2000 | 24/11/2000 |
| ZIMBABWE | Succession | 06/06/1980 | |