| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| ALGERIA | Accession | 31/10/1963 | |
| Australia | Extension | 01/01/1905 | |
| AUSTRIA | Accession | 18/01/1905 | |
| Bahamas | Extension | 01/01/1905 | |
| BAHAMAS | Succession | 10/06/1976 | |
| Barbados | Extension | 01/01/1905 | |
| BELGIUM | Signature | 18/05/1904 | |
| BELGIUM | Ratification | 03/07/1905 | |
| BRAZIL | Accession | 18/05/1905 | |
| British Guiana | Extension | 01/01/1905 | |
| British Solomon Islands | Extension | 06/11/1931 | |
| BULGARIA | Accession | 15/06/1921 | |
| Burma | Extension | 04/04/1939 | |
| Canada | Extension | 01/01/1905 | |
| Ceylon | Extension | 01/01/1905 | |
| COLOMBIA | Accession | 16/02/1937 | |
| CZECH REPUBLIC | Succession | 30/12/1993 | 01/01/1993 |
| CZECHOSLOVAKIA | Accession | 17/05/1921 | |
| DENMARK | Signature | 18/05/1904 | |
| DENMARK | Ratification | 18/01/1905 | |
| Fiji | Extension | 01/01/1905 | |
| FIJI | Succession | 12/06/1972 | |
| FINLAND | Accession | 27/09/1922 | |
| FRANCE | Signature | 18/05/1904 | |
| FRANCE | Ratification | 18/01/1905 | |
| GERMAN DEMOCRATIC REPUBLIC | Re-Application | 17/06/1974 | |
| GERMANY | Signature | 18/05/1904 | |
| GERMANY | Ratification | 18/01/1905 | |
| GERMANY FEDERAL REPUBLIC | Objection | 02/06/1976 | |
| GHANA | Succession | 07/04/1958 | |
| Gibraltar | Extension | 01/01/1905 | |
| Gilbert & Ellice Colony | Extension | 06/11/1931 | |
| Gold Coast | Extension | 01/01/1905 | |
| Hong Kong | Extension | 01/01/1905 | |
| Hong Kong | Withdrawal | 10/06/1997 | 01/07/1997 |
| HONG KONG SAR | Application | 06/06/1997 | 01/07/1997 |
| HUNGARY | Accession | 01/01/1905 | |
| India | Extension | 08/02/1920 | |
| ITALY | Signature | 18/05/1904 | |
| ITALY | Ratification | 18/01/1905 | |
| IVORY COAST | Succession | 08/12/1961 | |
| Jamaica | Extension | 01/01/1905 | |
| JAMAICA | Succession | 30/07/1964 | |
| LEBANON | Accession | 20/06/1949 | |
| Leeward Islands | Extension | 01/01/1905 | |
| LUXEMBOURG | Accession | 15/06/1910 | |
| MADAGASCAR | Succession | 09/10/1963 | |
| MALAWI | Accession | 10/06/1965 | |
| MALI | Succession | 02/02/1973 | |
| MALTA | Succession | 21/09/1964 | |
| Malta | Extension | 01/01/1905 | |
| Mauritius | Extension | 09/08/1912 | |
| MAURITIUS | Succession | 18/07/1969 | |
| MEXICO | Accession | 21/02/1956 | |
| MOROCCO | Succession | 07/11/1956 | |
| Nauru | Extension | 07/09/1936 | |
| NETHERLANDS THE | Signature | 18/05/1904 | |
| New Guinea | Extension | 07/09/1936 | |
| New Zealand | Extension | 01/01/1905 | |
| Newfoundland (UK) | Extension | 01/01/1905 | |
| Nigeria | Extension | 01/01/1905 | |
| NIGERIA | Succession | 18/05/1961 | |
| Nyasaland | Extension | 01/01/1905 | |
| Palestine | Extension | 06/11/1931 | |
| PORTUGAL | Signature | 18/05/1904 | |
| RUSSIA | Signature | 18/05/1904 | |
| RUSSIA | Ratification | 18/01/1905 | |
| Sarawak | Extension | 06/11/1931 | |
| Seychelles | Extension | 01/01/1905 | |
| Sierra Leone | Extension | 01/01/1905 | |
| SIERRA LEONE | Succession | 13/03/1962 | |
| SINGAPORE | Succession | 07/06/1966 | |
| Somaliland | Extension | 01/01/1905 | |
| Southern Rhodesia | Extension | 01/01/1905 | |
| SPAIN | Signature | 18/05/1904 | |
| SPAIN | Ratification | 18/01/1905 | |
| St Helena | Extension | 01/01/1905 | |
| SUDAN | Accession | 27/06/1932 | |
| SWEDEN AND NORWAY | Signature | 18/05/1904 | |
| SWEDEN AND NORWAY | Ratification | 18/01/1905 | |
| SWITZERLAND | Signature | 18/05/1904 | |
| SWITZERLAND | Ratification | 18/01/1905 | |
| Tanganyika | Extension | 14/04/1931 | |
| The Gambia | Extension | 01/01/1905 | |
| Trinidad | Extension | 01/01/1905 | |
| TRINIDAD AND TOBAGO | Succession | 31/08/1962 | |
| Uganda | Extension | 01/01/1905 | |
| UNITED KINGDOM | Signature | 18/05/1904 | |
| UNITED KINGDOM | Ratification | 30/07/1904 | |
| UNITED KINGDOM | Ratification | 18/01/1905 | |
| UNITED STATES OF AMERICA | Accession | 06/06/1908 | |
| Weihaiwei | Extension | 01/01/1905 | |
| Windward Islands | Extension | 01/01/1905 | |
| ZAMBIA | Succession | 26/03/1973 | |
| Zanzibar | Extension | 19/01/1932 | |
| ZIMBABWE | Succession | 01/12/1998 | 18/04/1980 |