| Country | Action | Action Date | Effective Date |
|---|
| ALGERIA | Accession | 18/08/1964 | 18/02/1965 |
| Antigua | Extension | 12/05/1965 | 12/11/1965 |
| ARGENTINA | Accession | 19/04/1961 | 19/10/1961 |
| Austral Islands | Extension | 23/04/1958 | 23/10/1958 |
| Australes Et Antarctiques | Extension | 23/04/1958 | 23/10/1958 |
| Bahamas | Extension | 12/05/1965 | 12/11/1965 |
| BELGIUM | Signature | 10/05/1952 | |
| BELGIUM | Ratification | 10/04/1961 | 10/10/1961 |
| BENIN | Extension | 23/04/1958 | 23/10/1958 |
| Bermuda | Extension | 30/05/1963 | 30/11/1963 |
| BRAZIL | Signature | 10/05/1952 | |
| British Guiana | Extension | 29/03/1963 | 29/09/1963 |
| British Honduras | Extension | 21/09/1965 | 21/03/1966 |
| British Virgin Islands | Extension | 29/05/1963 | 29/11/1963 |
| BURKINA FASO | Extension | 23/04/1958 | 23/10/1958 |
| CAMBODIA | Accession | 12/11/1956 | 12/05/1957 |
| CAMBODIA | Reservation | 12/11/1956 | |
| CAMEROON | Extension | 23/04/1958 | 23/10/1958 |
| Cayman Islands | Extension | 12/05/1965 | 12/11/1965 |
| CENTRAL AFRICAN REPUBLIC | Extension | 23/04/1958 | 23/10/1958 |
| CHAD | Extension | 23/04/1958 | 23/10/1958 |
| COMOROS ISLANDS | Extension | 23/04/1958 | 23/10/1958 |
| CONGO KINSHASA | Accession | 17/07/1967 | 17/01/1968 |
| CONGO, PEOPLES REPUBLIC OF | Extension | 23/04/1958 | 23/10/1958 |
| COSTA RICA | Accession | 13/07/1955 | 13/01/1956 |
| COSTA RICA | Reservation | 13/07/1955 | |
| COTE D'IVOIRE | Extension | 23/04/1958 | 23/10/1958 |
| CROATIA | Succession | 30/07/1992 | 08/10/1991 |
| CYPRUS | Accession | 17/03/1994 | 17/09/1994 |
| DENMARK | Signature | 10/05/1952 | |
| DJIBOUTI | Extension | 23/04/1958 | 23/10/1958 |
| DOMINICA, COMMONWEALTH OF | Extension | 12/05/1965 | 12/11/1965 |
| EGYPT | Signature | 06/01/1955 | |
| EGYPT | Ratification | 24/08/1955 | 24/02/1956 |
| Falkland Island Dependencies | Extension | 17/10/1969 | 17/04/1970 |
| Falkland Islands | Extension | 17/10/1969 | 17/04/1970 |
| Fiji | Extension | 29/03/1963 | 29/09/1963 |
| FIJI | Succession | 22/08/1972 | 10/10/1970 |
| FRANCE | Signature | 10/05/1952 | |
| FRANCE | Ratification | 25/05/1957 | 25/11/1957 |
| French Cameroons | Extension | 23/04/1958 | 23/10/1958 |
| French Togoland | Extension | 23/04/1958 | 23/10/1958 |
| GABON | Extension | 23/04/1958 | 23/10/1958 |
| GERMAN DEMOCRATIC REPUBLIC | Accession | 14/02/1979 | 14/08/1979 |
| GERMANY FEDERAL REPUBLIC | Signature | 10/05/1952 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 06/10/1972 | 06/04/1973 |
| Gibraltar | Extension | 29/03/1963 | 29/09/1963 |
| Gilbert And Ellice Islands | Extension | 21/09/1965 | 21/03/1966 |
| GREECE | Signature | 10/05/1952 | |
| GREECE | Ratification | 15/03/1965 | 15/09/1965 |
| Grenada | Extension | 12/05/1965 | 12/11/1965 |
| Guernsey | Extension | 08/12/1966 | 08/06/1967 |
| GUINEA | Extension | 23/04/1958 | 23/10/1958 |
| Hong Kong | Extension | 29/03/1963 | 29/09/1963 |
| HONG KONG SAR | Application | 04/06/1997 | 01/07/1997 |
| Iles Sous Le Vent | Extension | 23/04/1958 | 23/10/1958 |
| IRELAND | Accession | 17/10/1989 | 17/04/1990 |
| ITALY | Signature | 10/05/1952 | |
| ITALY | Ratification | 09/11/1979 | 09/05/1980 |
| Land Berlin | Extension | 06/10/1972 | 06/04/1973 |
| LEBANON | Signature | 25/05/1954 | |
| LUXEMBOURG | Accession | 18/02/1991 | 18/08/1991 |
| Macao | Extension | 23/03/1999 | 23/09/1999 |
| MALAGASY REPUBLIC | Extension | 23/04/1958 | 23/10/1958 |
| MALAGASY REPUBLIC | Succession | 13/07/1965 | |
| Marquises, Archipel Des Isles | Extension | 23/04/1958 | 23/10/1958 |
| MAURITANIA | Extension | 23/04/1958 | 23/10/1958 |
| Mauritius | Extension | 29/03/1963 | 29/09/1963 |
| MONACO | Signature | 10/05/1952 | |
| Montserrat | Extension | 12/05/1965 | 12/11/1965 |
| MOROCCO | Accession | 11/07/1990 | 11/01/1991 |
| New Caledonia And Dependences | Extension | 23/04/1958 | 23/10/1958 |
| NICARAGUA | Signature | 10/05/1952 | |
| NIGER | Extension | 23/04/1958 | 23/10/1958 |
| NIGERIA | Accession | 07/11/1963 | 07/05/1964 |
| North Borneo | Extension | 29/03/1963 | 29/09/1963 |
| PARAGUAY | Accession | 22/11/1967 | 22/05/1968 |
| POLAND | Accession | 14/03/1986 | 14/09/1986 |
| PORTUGAL | Signature | 16/10/1956 | |
| PORTUGAL | Ratification | 04/05/1957 | 04/11/1957 |
| PORTUGAL | Communication | 20/10/1999 | |
| ROMANIA | Accession | 28/11/1995 | 28/05/1996 |
| SAINT LUCIA | Declaration | 21/03/1990 | |
| Sarawak | Extension | 28/08/1962 | 28/01/1963 |
| SENEGAL | Extension | 23/04/1958 | 23/10/1958 |
| Seychelles | Extension | 29/03/1963 | 29/09/1963 |
| SLOVENIA | Succession | 13/10/1993 | 25/06/1991 |
| Solomon Islands | Extension | 21/09/1965 | 21/03/1966 |
| SOLOMON ISLANDS | Succession | 17/09/1981 | 07/07/1978 |
| SPAIN | Signature | 10/05/1952 | |
| SPAIN | Ratification | 08/12/1953 | 14/09/1955 |
| St Helena | Extension | 12/05/1965 | 12/11/1965 |
| St Kitts Nevis Anguilla | Extension | 12/05/1965 | 12/11/1965 |
| St Lucia | Extension | 12/05/1965 | 12/11/1965 |
| St Pierre and Miquelon | Extension | 23/04/1958 | 23/10/1958 |
| St Vincent | Extension | 12/05/1965 | 12/11/1965 |
| ST VINCENT AND THE GRENADINES | Succession | 15/02/2002 | 28/10/1979 |
| SUDAN | Extension | 23/04/1958 | 23/10/1958 |
| SWITZERLAND | Accession | 28/05/1954 | 14/09/1955 |
| SYRIA | Accession | 01/08/1974 | 01/02/1975 |
| Tahiti Et Dependences | Extension | 23/04/1958 | 23/10/1958 |
| TOGO | Extension | 23/04/1958 | 23/10/1958 |
| TONGA | Accession | 13/06/1978 | 13/12/1978 |
| Tuamotu & Gambier, Archipel Des Isles | Extension | 23/04/1958 | 23/10/1958 |
| Turks And Caicos Islands | Extension | 21/09/1965 | 21/03/1966 |
| UNITED KINGDOM | Signature | 10/05/1952 | |
| UNITED KINGDOM | Ratification | 18/03/1959 | |
| UNITED KINGDOM | Ratification | 18/03/1959 | 18/09/1959 |
| VATICAN CITY | Signature | 04/02/1954 | |
| VATICAN CITY | Ratification | 10/08/1956 | 10/02/1957 |
| Wallis And Futuna Islands | Extension | 23/04/1958 | 23/10/1958 |
| YUGOSLAVIA | Signature | 10/05/1952 | |
| YUGOSLAVIA | Reservation | 10/05/1952 | |
| YUGOSLAVIA | Ratification | 14/03/1955 | 14/09/1955 |