| Country | Action | Action Date | Effective Date |
|---|
| AFGHANISTAN | Accession | 10/05/1937 | |
| ALBANIA | Signature | 12/09/1923 | |
| ALBANIA | Ratification | 13/10/1924 | |
| Antilles | Extension | | 01/01/1986 |
| ARGENTINE REPUBLIC | Accession | 03/10/1936 | |
| Aruba | Extension | | 01/01/1986 |
| AUSTRALIA | Accession | 29/06/1935 | |
| AUSTRIA | Signature | 12/09/1923 | |
| AUSTRIA | Ratification | 12/01/1925 | |
| Bahamas | Extension | 23/05/1927 | |
| Barbados | Extension | 03/11/1926 | |
| Basutoland | Extension | 03/11/1926 | |
| Bechuanaland | Extension | 03/11/1926 | |
| BELGIUM | Signature | 12/09/1923 | |
| BELGIUM | Ratification | 31/07/1926 | |
| Bermuda | Extension | 23/05/1927 | |
| BRAZIL | Signature | 12/09/1923 | |
| BRAZIL | Ratification | 19/09/1931 | |
| BRITISH EMPIRE | Signature | 12/09/1923 | |
| BRITISH EMPIRE | Declaration | 12/09/1923 | |
| BRITISH EMPIRE | Ratification | 11/12/1925 | |
| BRITISH EMPIRE | Re-Application | 13/10/1953 | 01/01/1953 |
| British Guiana | Extension | 23/09/1929 | |
| British Honduras | Extension | 03/11/1926 | |
| Brunei | Extension | 03/11/1926 | |
| BULGARIA | Signature | 12/09/1923 | |
| BULGARIA | Ratification | 01/07/1924 | |
| Burma | Extension | 01/04/1937 | |
| CAMBODIA | Accession | 30/03/1959 | |
| CANADA | Accession | 07/08/1924 | |
| Ceylon | Extension | 03/11/1926 | |
| CEYLON | Succession | 15/04/1958 | |
| CHINA | Signature | 12/09/1923 | |
| CHINA | Ratification | 24/02/1926 | |
| COLOMBIA | Signature | 12/09/1923 | |
| COLOMBIA | Ratification | 08/11/1934 | |
| CONGO, DEMOCRATIC REPUBLIC OF | Succession | 31/05/1962 | |
| COSTA RICA | Signature | 12/09/1923 | |
| CUBA | Signature | 12/09/1923 | |
| CUBA | Ratification | 20/09/1934 | |
| Curacao | Extension | 12/09/1923 | |
| Cyprus | Extension | 03/11/1926 | |
| CYPRUS | Succession | 16/05/1963 | |
| CZECH REPUBLIC | Succession | 01/01/1993 | 01/01/1993 |
| CZECHOSLOVAKIA | Signature | 12/09/1923 | |
| CZECHOSLOVAKIA | Ratification | 11/04/1927 | |
| DANZIG | Signature | 12/09/1923 | |
| DANZIG | Ratification | 31/03/1926 | |
| DENMARK | Signature | 12/09/1923 | |
| DENMARK | Declaration | 12/09/1923 | |
| DENMARK | Ratification | 06/05/1930 | |
| DENMARK | Withdrawal | 16/08/1967 | 16/08/1968 |
| East Indies | Extension | 12/09/1923 | |
| EGYPT | Accession | 29/10/1924 | |
| ESTONIA | Accession | 10/03/1936 | |
| Falkland Island Dependencies | Extension | 23/05/1927 | |
| Falkland Islands | Extension | 23/05/1927 | |
| Fiji | Extension | 03/11/1926 | |
| FIJI | Succession | 01/11/1971 | |
| FINLAND | Signature | 12/09/1923 | |
| FINLAND | Ratification | 29/06/1925 | |
| FRANCE | Signature | 12/09/1923 | |
| FRANCE | Declaration | 12/09/1923 | |
| FRANCE | Ratification | 16/01/1940 | |
| GERMAN DEMOCRATIC REPUBLIC | Re-Application | 18/12/1958 | |
| GERMAN DEMOCRATIC REPUBLIC | Re-Application | 31/01/1974 | |
| GERMANY | Signature | 12/09/1923 | |
| GERMANY | Ratification | 11/05/1925 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | | 01/07/1954 |
| GERMANY FEDERAL REPUBLIC | Re-Application | | 20/07/1955 |
| GERMANY FEDERAL REPUBLIC | Re-Application | 13/10/1953 | 01/01/1953 |
| GERMANY FEDERAL REPUBLIC | Withdrawal | 25/01/1974 | 25/01/1975 |
| GHANA | Succession | 07/04/1958 | |
| Gibraltar | Extension | 03/11/1926 | |
| Gilbert And Ellice Islands | Extension | 03/11/1926 | |
| Gold Coast | Extension | 03/11/1926 | |
| GREECE | Signature | 12/09/1923 | |
| GREECE | Ratification | 09/10/1929 | |
| GUATEMALA | Accession | 25/10/1933 | |
| HAITI | Signature | 12/09/1923 | |
| HAITI | Ratification | 26/08/1953 | |
| HONDURAS | Signature | 12/09/1923 | |
| Hong Kong | Extension | 03/11/1926 | |
| Hong Kong | Withdrawal | 10/06/1997 | 01/07/1997 |
| HONG KONG SAR | Application | 10/06/1997 | 01/07/1997 |
| HUNGARY | Signature | 12/09/1923 | |
| HUNGARY | Ratification | 12/02/1929 | |
| INDIA | Signature | 12/09/1923 | |
| INDIA | Ratification | 11/12/1925 | |
| IRAQ | Accession | 26/04/1929 | |
| Irish Free State | Signature | 09/12/1923 | |
| Irish Free State | Ratification | 15/09/1930 | |
| ITALY | Signature | 12/09/1923 | |
| ITALY | Ratification | 08/07/1924 | |
| Jamaica | Extension | 22/08/1927 | |
| JAMAICA | Succession | 30/07/1964 | |
| JAPAN | Signature | 12/09/1923 | |
| JAPAN | Declaration | 12/09/1923 | |
| JAPAN | Letter | 14/02/1936 | |
| JAPAN | Ratification | 13/05/1936 | |
| JORDAN | Accession | 11/05/1959 | |
| Kenya | Extension | 03/11/1926 | |
| LATVIA | Signature | 12/09/1923 | |
| LATVIA | Ratification | 07/10/1925 | |
| Leeward Islands | Extension | 03/11/1926 | |
| LESOTHO | Succession | 28/11/1975 | |
| LITHUANIA | Signature | 12/09/1923 | |
| LUXEMBOURG | Signature | 12/09/1923 | |
| LUXEMBOURG | Ratification | 10/08/1927 | |
| LUXEMBOURG | Reservation | 10/08/1927 | |
| MALAWI | Succession | 22/07/1965 | |
| Malay States, Federated | Extension | 03/11/1926 | |
| Malay States, Unfederated | Succession | 03/11/1926 | |
| MALAYA | Succession | 21/08/1957 | |
| Malta | Extension | 03/11/1926 | |
| MALTA | Succession | 21/09/1964 | |
| Mauritius | Extension | 03/11/1926 | |
| MAURITIUS | Succession | 12/03/1968 | |
| MEXICO | Accession | 09/01/1948 | |
| MONACO | Signature | 12/09/1923 | |
| MONACO | Ratification | 11/05/1925 | |
| MOROCCO | Accession | 07/05/1940 | |
| Nauru | Extension | 29/06/1935 | |
| NETHERLANDS THE | Signature | 12/09/1923 | |
| NETHERLANDS THE | Ratification | 13/09/1927 | |
| NETHERLANDS THE | Denunciation | 30/07/1985 | 30/07/1986 |
| New Guinea | Extension | 29/06/1935 | |
| NEW ZEALAND | Signature | 12/09/1923 | |
| NEW ZEALAND | Ratification | 11/12/1925 | |
| Newfoundland (UK) | Extension | 31/12/1925 | |
| Nigeria | Extension | 03/11/1926 | |
| NIGERIA | Succession | 26/06/1961 | |
| Norfolk Island | Extension | 29/06/1935 | |
| Northern Rhodesia | Extension | 03/11/1926 | |
| NORWAY | Accession | 08/05/1929 | |
| Nyasaland | Extension | 03/11/1926 | |
| Palestine | Extension | 23/05/1927 | |
| PANAMA | Signature | 12/09/1923 | |
| Papua | Extension | 29/06/1935 | |
| PARAGUAY | Accession | 21/10/1933 | |
| PERSIA | Signature | 12/09/1923 | |
| PERSIA | Ratification | 28/09/1932 | |
| POLAND | Signature | 12/09/1923 | |
| POLAND | Ratification | 08/03/1927 | |
| PORTUGAL | Signature | 12/09/1923 | |
| PORTUGAL | Ratification | 04/10/1927 | |
| ROUMANIA | Signature | 21/01/1924 | |
| ROUMANIA | Ratification | 07/06/1926 | |
| SALVADOR | Signature | 12/09/1923 | |
| SALVADOR | Ratification | 02/07/1937 | |
| SAN MARINO | Accession | 21/04/1926 | |
| SARAWAK | Extension | 16/05/1949 | |
| SERB-CROAT-SLOVENE STATE | Signature | 12/09/1923 | |
| SERB-CROAT-SLOVENE STATE | Ratification | 02/05/1929 | |
| Seychelles | Extension | 03/11/1926 | |
| SIAM | Signature | 12/09/1923 | |
| SIAM | Reservation | 12/09/1923 | |
| SIAM | Ratification | 28/07/1924 | |
| Sierra Leone | Extension | 03/11/1926 | |
| SIERRA LEONE | Succession | 13/03/1962 | |
| SLOVAK REPUBLIC | Extension | 28/05/1993 | 01/01/1993 |
| SOLOMON ISLANDS | Succession | 03/09/1981 | |
| Solomon Islands Protectorate | Extension | 03/11/1926 | |
| Somaliland | Extension | 03/11/1926 | |
| SOUTH AFRICA | Signature | 05/03/1924 | |
| SOUTH AFRICA | Ratification | 11/12/1925 | |
| South West Africa | Extension | 05/03/1924 | |
| Southern Rhodesia | Extension | 31/12/1925 | |
| SOVIET UNION | Accession | 08/07/1935 | |
| SPAIN | Signature | 12/09/1923 | |
| SPAIN | Ratification | 19/12/1924 | |
| St Helena | Extension | 23/05/1927 | |
| Straits Settlements | Extension | 03/11/1926 | |
| Surinam | Extension | 12/09/1923 | |
| Swaziland | Extension | 03/11/1926 | |
| SWITZERLAND | Signature | 12/09/1923 | |
| SWITZERLAND | Ratification | 20/01/1926 | |
| Tanganyika | Extension | 03/11/1926 | |
| TANGANYIKA | Succession | 28/11/1962 | |
| The Gambia | Extension | 03/11/1926 | |
| Transjordan | Extension | 23/05/1927 | |
| Trinidad And Tobago | Extension | 03/11/1926 | |
| TRINIDAD AND TOBAGO | Succession | 31/08/1962 | |
| TURKEY | Signature | 12/09/1923 | |
| TURKEY | Ratification | 12/09/1929 | |
| Uganda | Extension | 03/11/1926 | |
| UNITED KINGDOM | Signature | 12/09/1923 | |
| UNITED KINGDOM | Ratification | 11/12/1925 | |
| URUGUAY | Signature | 12/09/1923 | |
| West Indies | Extension | 12/09/1923 | |
| Western Samoa | Extension | 12/09/1923 | |
| Windward Islands | Extension | 03/11/1926 | |
| YUGOSLAVIA, FEDERAL REPUBLIC OF | Succession | 12/03/2001 | 27/04/1992 |
| ZAMBIA | Succession | 01/11/1974 | |
| Zanzibar | Extension | 03/11/1926 | |
| ZIMBABWE | Succession | 01/12/1998 | 18/04/1980 |