| Country | Action | Action Date | Effective Date |
|---|
| Antigua | Extension | 22/09/1925 | |
| ANTIGUA AND BARBUDA | Succession | 27/02/1989 | 01/11/1981 |
| Antilles | Extension | | 01/01/1986 |
| Aruba | Extension | | 01/01/1986 |
| Australia | Extension | 29/06/1925 | |
| Australia | Re-Application | 01/07/1954 | |
| AUSTRIA | Accession | 20/01/1927 | |
| Bahamas | Extension | 22/09/1925 | |
| Barbados | Extension | 22/09/1925 | |
| BELGIUM | Signature | 09/12/1923 | |
| BELGIUM | Ratification | 16/05/1927 | |
| BELGIUM | Declaration | 16/05/1927 | |
| BELGIUM | Reservation | 16/05/1927 | |
| Bermuda | Extension | 22/09/1925 | |
| BRAZIL | Signature | 09/12/1923 | |
| BRITISH EMPIRE | Re-Application | | 01/01/1953 |
| BRITISH EMPIRE | Signature | 09/12/1923 | |
| BRITISH EMPIRE | Ratification | 29/08/1924 | |
| British Guiana | Extension | 22/09/1925 | |
| British Honduras | Extension | 22/09/1925 | |
| British Solomon Islands | Extension | 22/09/1925 | |
| British Virgin Islands | Extension | 22/09/1925 | |
| Brunei | Extension | 22/09/1925 | |
| BULGARIA | Signature | 31/10/1924 | |
| Ceylon | Extension | 22/09/1925 | |
| CHILE | Signature | 09/12/1923 | |
| CROATIA | Succession | 03/08/1992 | 08/10/1992 |
| Curacao | Extension | 22/02/1928 | |
| Curacao | Reservation | 22/02/1928 | |
| Cyprus | Extension | 22/09/1925 | |
| CYPRUS | Succession | 09/11/1964 | |
| CZECH REPUBLIC | Succession | 09/02/1996 | 01/01/1993 |
| CZECHOSLOVAKIA | Signature | 09/12/1923 | |
| CZECHOSLOVAKIA | Reservation | 09/12/1923 | |
| CZECHOSLOVAKIA | Ratification | 10/07/1931 | |
| DENMARK | Signature | 09/12/1923 | |
| DENMARK | Ratification | 27/04/1926 | |
| DENMARK | Declaration | 27/04/1926 | |
| Dominica | Extension | 22/09/1925 | |
| East Indies | Extension | 22/02/1928 | |
| East Indies | Reservation | 22/02/1928 | |
| ESTONIA | Signature | 09/12/1923 | |
| ESTONIA | Ratification | 04/11/1931 | |
| ESTONIA | Reservation | 04/11/1931 | |
| Falkland Islands | Extension | 22/09/1925 | |
| FIJI | Succession | | 15/03/1972 |
| Fiji | Extension | 22/09/1925 | |
| FRANCE | Accession | 01/12/1924 | |
| FRANCE | Reservation | 01/12/1924 | |
| FRANCE | Ratification | 02/08/1932 | |
| FRANCE | Reservation | 02/08/1932 | |
| GERMANY | Signature | 09/12/1923 | |
| GERMANY | Ratification | 01/05/1928 | |
| GERMANY | Reservation | 01/05/1928 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | | 01/01/1953 |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/07/1954 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/08/1956 | |
| Gibraltar | Extension | 22/09/1925 | |
| Gilbert & Ellice Colony | Extension | 22/09/1925 | |
| Gold Coast | Extension | 22/09/1925 | |
| GREECE | Signature | 09/12/1923 | |
| GREECE | Reservation | 09/12/1923 | |
| GREECE | Ratification | 24/01/1927 | |
| Grenada | Extension | 22/09/1925 | |
| Hong Kong | Extension | 22/09/1925 | |
| HONG KONG SAR | Application | 06/06/1997 | 01/07/1997 |
| HUNGARY | Signature | 09/12/1923 | |
| HUNGARY | Ratification | 21/03/1929 | |
| HUNGARY | Reservation | 21/03/1929 | |
| India | Signature | 09/12/1923 | |
| India | Ratification | 01/04/1925 | |
| IRAQ | Accession | 01/05/1929 | |
| IRAQ | Reservation | 01/05/1929 | |
| ITALY | Signature | 09/12/1923 | |
| ITALY | Reservation | 09/12/1923 | |
| ITALY | Ratification | 16/10/1933 | |
| ITALY | Reservation | 16/10/1933 | |
| IVORY COAST | Accession | 22/06/1966 | |
| Jamaica | Extension | 22/09/1925 | |
| JAPAN | Signature | 09/12/1923 | |
| JAPAN | Ratification | 30/09/1926 | |
| JAPAN | Reservation | 30/09/1926 | |
| Kenya | Extension | 22/09/1925 | |
| Leeward Islands | Extension | 22/09/1925 | |
| LITHUANIA | Signature | 09/12/1923 | |
| LITHUANIA | Reservation | 09/12/1923 | |
| MADAGASCAR | Accession | 04/10/1967 | |
| Malay States, Federated | Extension | 22/09/1925 | |
| Malay States, Unfederated | Extension | 22/09/1925 | |
| MALAYSIA | Accession | 31/08/1966 | |
| MALTA | Succession | | 18/04/1966 |
| Malta | Extension | 07/11/1925 | |
| MARSHALL ISLANDS | Accession | 02/02/1944 | 03/05/1994 |
| MAURITIUS | Succession | | 12/03/1968 |
| Mauritius | Extension | 22/09/1925 | |
| MEXICO | Accession | 05/03/1934 | |
| MONACO | Signature | 20/02/1976 | 20/05/1976 |
| Montserrat | Extension | 22/09/1925 | |
| MOROCCO | Accession | 19/10/1972 | 17/01/1973 |
| NETHERLANDS THE | Signature | 09/12/1923 | |
| NETHERLANDS THE | Ratification | 22/02/1928 | |
| NETHERLANDS THE | Reservation | 22/02/1928 | |
| New Zealand | Signature | 09/12/1923 | |
| New Zealand | Ratification | 01/04/1925 | |
| Newfoundland (UK) | Extension | 23/04/1925 | |
| Nigeria | Extension | 22/09/1925 | |
| NIGERIA | Accession | 03/11/1967 | |
| NORWAY | Signature | 09/12/1923 | |
| NORWAY | Ratification | 21/06/1928 | |
| Palestine | Extension | 22/09/1925 | |
| PANAMA | Accession | 01/01/1905 | |
| SALVADOR | Signature | 09/12/1923 | |
| SERB-CROAT-SLOVENE STATE | Signature | 09/12/1923 | |
| SERB-CROAT-SLOVENE STATE | Reservation | 09/12/1923 | |
| SERB-CROAT-SLOVENE STATE | Ratification | 20/11/1931 | |
| Seychelles | Extension | 22/09/1925 | |
| SIAM | Signature | 09/12/1923 | |
| SIAM | Ratification | 09/01/1925 | |
| SIAM | Withdrawal | 02/10/1973 | 02/10/1974 |
| Sierra Leone | Extension | 22/09/1925 | |
| SLOVAK REPUBLIC | Succession | 28/05/1993 | 01/01/1993 |
| SOLOMON ISLANDS | Notification | 21/08/1981 | |
| Somaliland | Extension | 22/09/1925 | |
| Southern Rhodesia | Extension | 23/04/1925 | |
| Southern Rhodesia | Re-Application | 01/08/1956 | |
| SPAIN | Signature | 09/12/1923 | |
| SPAIN | Reservation | 09/12/1923 | |
| St Helena | Extension | 22/09/1925 | |
| St Lucia | Extension | 22/09/1925 | |
| St Vincent | Extension | 22/09/1925 | |
| ST VINCENT AND THE GRENADINES | Succession | 05/09/2001 | 27/10/1979 |
| St. Christopher And Nevis | Extension | 22/09/1925 | |
| Straits Settlements | Extension | 22/09/1925 | |
| Surinam | Extension | 22/02/1928 | |
| Surinam | Reservation | 22/02/1928 | |
| SWEDEN | Signature | 09/12/1923 | |
| SWEDEN | Ratification | 15/09/1927 | |
| SWITZERLAND | Signature | 09/12/1923 | |
| SWITZERLAND | Ratification | 23/10/1926 | |
| Tanganyika | Extension | 22/09/1925 | |
| The Gambia | Extension | 22/09/1925 | |
| Tonga | Extension | 22/09/1925 | |
| Transjordan | Termination | 01/01/1900 | |
| Transjordan | Extension | 22/09/1925 | |
| Trinidad And Tobago | Extension | 22/09/1925 | |
| TRINIDAD AND TOBAGO | Accession | 14/06/1966 | |
| UNITED KINGDOM | Signature | 09/12/1923 | |
| UNITED KINGDOM | Ratification | 29/08/1924 | |
| UPPER VOLTA | Accession | 18/07/1966 | |
| URUGUAY | Signature | 09/12/1923 | |
| VANUATU | Accession | 08/05/1991 | 06/08/1991 |
| West Indies | Extension | 22/02/1928 | |
| West Indies | Reservation | 22/02/1928 | |
| Western Samoa | Extension | 01/04/1925 | |
| Zanzibar | Extension | 22/09/1925 | |
| ZIMBABWE | Succession | 01/12/1998 | 18/04/1980 |