| Country | Action | Action Date | Effective Date |
|---|
| ALGERIA | Accession | 31/10/1963 | |
| Australia | Extension | 18/02/1914 | |
| AUSTRIA-HUNGARY | Signature | 04/05/1910 | |
| AUSTRIA-HUNGARY | Ratification | 08/08/1912 | |
| Bahamas | Extension | 04/11/1921 | |
| BAHAMAS | Succession | 10/06/1976 | |
| Barbados | Extension | 15/03/1923 | |
| BELGIUM | Signature | 04/05/1910 | |
| BELGIUM | Ratification | 30/07/1914 | |
| BRAZIL | Signature | 04/05/1910 | |
| BRAZIL | Ratification | 03/06/1924 | |
| British Guiana | Extension | 15/03/1923 | |
| British Honduras | Extension | 15/03/1923 | |
| British Solomon Islands | Extension | 06/11/1931 | |
| BULGARIA | Accession | 15/06/1921 | |
| Burma | Extension | 04/04/1939 | |
| CAMEROON | Succession | 03/11/1961 | |
| Cameroon & Togo Trust Territories | Extension | 03/11/1961 | |
| Canada | Extension | 25/08/1913 | |
| CENTRAL AFRICAN REPUBLIC | Succession | 04/09/1962 | |
| Ceylon | Extension | 04/11/1921 | |
| CHILE | Accession | 27/09/1934 | |
| CHILE | Ratification | 02/07/1935 | |
| CHINA | Accession | 06/11/1925 | |
| COLOMBIA | Accession | 16/02/1937 | |
| CONGO, DEMOCRATIC REPUBLIC OF | Succession | 15/10/1962 | |
| CUBA | Accession | 09/07/1923 | |
| Curacao | Extension | 14/11/1921 | |
| Cyprus | Extension | 04/11/1921 | |
| CYPRUS | Succession | 16/05/1963 | |
| CZECH REPUBLIC | Succession | 30/12/1993 | |
| CZECHOSLOVAKIA | Accession | 17/05/1921 | |
| DAHOMEY | Succession | 04/04/1962 | |
| DANZIG | Accession | 22/08/1921 | |
| DENMARK | Signature | 04/05/1910 | |
| DENMARK | Reservation | 03/06/1931 | |
| DENMARK | Ratification | 03/06/1931 | |
| East Indies | Extension | 05/03/1913 | |
| EGYPT | Accession | 11/10/1932 | |
| ESTONIA | Accession | 15/04/1930 | |
| Falkland Islands | Extension | 30/04/1924 | |
| Fiji | Extension | 04/11/1921 | |
| FIJI | Succession | 12/06/1972 | |
| FINLAND | Accession | 27/09/1922 | |
| FRANCE | Signature | 04/05/1910 | |
| FRANCE | Ratification | 08/08/1912 | |
| French Colonies | Extension | 01/01/1922 | |
| GERMAN DEMOCRATIC REPUBLIC | Re-Application | 10/08/1958 | |
| GERMAN DEMOCRATIC REPUBLIC | Communication | 17/06/1974 | |
| GERMAN DEMOCRATIC REPUBLIC | Declaration | 02/03/1976 | |
| GERMANY | Signature | 04/05/1910 | |
| GERMANY | Ratification | 23/08/1912 | |
| GERMANY FEDERAL REPUBLIC | Declaration | 02/03/1976 | |
| GHANA | Succession | 07/04/1958 | |
| Gibraltar | Extension | 04/11/1921 | |
| Gilbert & Ellice Colony | Extension | 06/11/1931 | |
| Gold Coast | Extension | 21/06/1924 | |
| Grenada | Extension | 15/03/1923 | |
| Guernsey | Extension | 21/09/1923 | |
| Hong Kong | Extension | 04/11/1921 | |
| Hong Kong | Termination | 01/07/1997 | |
| HONG KONG SAR | Notification | 06/06/1997 | 01/07/1997 |
| India | Extension | 27/03/1922 | |
| Irak | Extension | 24/04/1925 | |
| Irak | Reservation | 24/04/1925 | |
| Irish Free State | Extension | 08/06/1934 | |
| Isle of Man | Extension | 21/09/1923 | |
| ITALY | Signature | 04/05/1910 | |
| ITALY | Ratification | 28/05/1924 | |
| IVORY COAST | Succession | 08/12/1961 | |
| Jamaica | Extension | 04/11/1921 | |
| JAMAICA | Succession | 17/03/1965 | |
| JAPAN | Accession | 20/10/1925 | |
| Jersey | Extension | 21/09/1923 | |
| Kenya | Extension | 04/11/1921 | |
| LEBANON | Accession | 22/09/1949 | |
| Leeward Islands | Extension | 08/03/1924 | |
| LITHUANIA | Accession | 30/10/1930 | |
| LUXEMBOURG | Accession | 10/04/1928 | |
| MADAGASCAR | Succession | 09/10/1963 | |
| MALAWI | Accession | 10/06/1965 | |
| MALI | Succession | 02/02/1973 | |
| MALTA | Succession | | 21/09/1964 |
| Malta | Extension | 04/11/1921 | |
| Mauritius | Extension | 08/03/1924 | |
| MAURITIUS | Succession | 18/07/1969 | 12/03/1968 |
| MEXICO | Accession | 21/02/1956 | |
| MONACO | Accession | 02/07/1921 | |
| Morocco | Extension | 01/01/1922 | |
| MOROCCO | Succession | 07/11/1956 | |
| Nauru | Extension | 07/09/1936 | |
| NETHERLANDS THE | Signature | 04/05/1910 | |
| NETHERLANDS THE | Ratification | 08/08/1912 | |
| New Guinea | Extension | 07/09/1936 | |
| New Zealand | Extension | 01/10/1913 | |
| Newfoundland (UK) | Extension | 01/10/1913 | |
| NIGER | Succession | 25/08/1961 | |
| Norfolk Island | Extension | 18/02/1914 | |
| NORWAY | Accession | 26/12/1921 | |
| Nyasaland | Extension | 04/11/1921 | |
| Palestine | Extension | 06/11/1931 | |
| Papua | Extension | 18/01/1914 | |
| PERSIA | Accession | 27/04/1933 | |
| POLAND | Accession | 21/01/1921 | |
| PORTUGAL | Signature | 04/05/1910 | |
| PORTUGAL | Ratification | 09/09/1913 | |
| RUSSIA | Signature | 04/05/1910 | |
| RUSSIA | Ratification | 08/08/1912 | |
| Sarawak | Extension | 06/11/1931 | |
| SENEGAL | Succession | 02/05/1963 | |
| SERB-CROAT-SLOVENE STATE | Accession | 12/04/1929 | |
| Seychelles | Extension | 15/03/1923 | |
| SIAM | Accession | 28/12/1921 | |
| Sierra Leone | Extension | 27/09/1927 | |
| SIERRA LEONE | Succession | 13/03/1962 | |
| SINGAPORE | Succession | 07/06/1966 | |
| South Africa | Extension | 19/09/1913 | |
| Southern Rhodesia | Extension | 04/11/1921 | |
| SPAIN | Signature | 04/05/1910 | |
| SPAIN | Ratification | 08/08/1912 | |
| St Lucia | Extension | 15/03/1923 | |
| St Vincent | Extension | 15/03/1923 | |
| Straits Settlements | Extension | 04/11/1921 | |
| SUDAN | Accession | 27/06/1932 | |
| Surinam | Extension | 14/11/1921 | |
| SWEDEN | Signature | 04/05/1910 | |
| SWEDEN | Ratification | 30/06/1925 | |
| SWITZERLAND | Accession | 01/02/1926 | |
| Tanganyika | Extension | 14/04/1931 | |
| TANGANYIKA | Succession | 18/03/1963 | |
| The Gambia | Extension | 14/04/1931 | |
| Transjordan | Extension | 06/11/1931 | |
| Trinidad | Extension | 04/11/1921 | |
| TRINIDAD AND TOBAGO | Succession | | 31/08/1962 |
| Tunis | Extension | 01/01/1922 | |
| TURKEY | Accession | 19/12/1934 | |
| Uganda | Extension | 14/04/1931 | |
| UNITED KINGDOM | Signature | 04/05/1910 | |
| UNITED KINGDOM | Ratification | 08/08/1912 | |
| UNITED KINGDOM | Notification | 10/06/1997 | 01/07/1997 |
| URUGUAY | Accession | 30/06/1920 | |
| Zanzibar | Extension | 19/01/1932 | |
| ZIMBABWE | Succession | 01/12/1998 | 18/04/1980 |