| Country | Action | Action Date | Effective Date |
|---|
| AFGHANISTAN | Accession | 10/04/1935 | |
| ALBANIA | Signature | 30/09/1921 | |
| ALBANIA | Ratification | 13/10/1924 | |
| ALGERIA | Accession | 31/10/1963 | |
| Antilles | Extension | 01/01/1986 | |
| ARGENTINE REPUBLIC | Accession | 03/10/1936 | |
| Aruba | Extension | 01/01/1986 | |
| AUSTRALIA | Signature | 30/09/1921 | |
| AUSTRALIA | Declaration | 30/09/1921 | |
| AUSTRALIA | Ratification | 28/06/1922 | |
| AUSTRIA | Signature | 30/09/1921 | |
| AUSTRIA | Ratification | 09/08/1922 | |
| Bahamas | Extension | 23/09/1922 | |
| BAHAMAS | Succession | 10/06/1976 | |
| Barbados | Extension | 23/09/1922 | |
| BELGIUM | Signature | 30/09/1921 | |
| BELGIUM | Ratification | 15/06/1922 | |
| BRAZIL | Signature | 30/09/1921 | |
| BRAZIL | Ratification | 18/08/1933 | |
| BRITISH EMPIRE | Signature | 30/09/1921 | |
| BRITISH EMPIRE | Declaration | 30/09/1921 | |
| BRITISH EMPIRE | Ratification | 28/06/1922 | |
| British Guiana | Extension | 31/10/1922 | |
| British Honduras | Extension | 23/09/1922 | |
| British Solomon Islands | Extension | 02/11/1931 | |
| BULGARIA | Accession | 29/04/1925 | |
| Burma | Extension | 03/04/1939 | |
| Burma | Reservation | 03/04/1939 | |
| BYELORUSSIA S S R | Accession | 21/05/1948 | |
| CANADA | Signature | 30/09/1921 | |
| CANADA | Ratification | 28/06/1922 | |
| Ceylon | Extension | 23/09/1922 | |
| CHILE | Signature | 30/09/1921 | |
| CHILE | Ratification | 15/01/1929 | |
| CHINA | Signature | 30/09/1921 | |
| CHINA | Ratification | 24/02/1926 | |
| CHINA | Communication | 03/12/1999 | 20/12/1999 |
| COLOMBIA | Signature | 30/09/1921 | |
| COLOMBIA | Reservation | 30/09/1921 | |
| COLOMBIA | Ratification | 08/11/1934 | |
| COSTA RICA | Signature | 30/09/1921 | |
| CUBA | Signature | 30/09/1921 | |
| CUBA | Ratification | 07/05/1923 | |
| Cyprus | Extension | 23/09/1922 | |
| CYPRUS | Succession | 16/05/1963 | |
| CZECH REPUBLIC | Succession | 30/12/1993 | 01/01/1993 |
| CZECHOSLOVAKIA | Signature | 30/09/1921 | |
| CZECHOSLOVAKIA | Ratification | 29/09/1923 | |
| DANZIG | Signature | 30/09/1921 | |
| DANZIG | Ratification | 08/10/1924 | |
| DENMARK | Accession | 23/04/1931 | 01/01/1753 |
| DENMARK | Reservation | 23/04/1931 | |
| EGYPT | Accession | 13/04/1932 | |
| ESTONIA | Signature | 30/09/1921 | |
| ESTONIA | Ratification | 28/02/1930 | |
| Falkland Island Dependencies | Extension | 08/05/1924 | |
| Falkland Islands | Extension | 08/05/1924 | |
| Fiji | Extension | 31/10/1922 | |
| FIJI | Succession | 12/06/1972 | |
| FINLAND | Accession | 16/08/1926 | |
| FRANCE | Accession | 16/01/1926 | |
| FRANCE | Ratification | 01/03/1926 | |
| FRANCE | Reservation | 01/03/1926 | |
| GERMAN DEMOCRATIC REPUBLIC | Statement | 01/01/1905 | |
| GERMAN DEMOCRATIC REPUBLIC | Re-Application | 08/03/1958 | |
| GERMAN DEMOCRATIC REPUBLIC | Re-Application | 31/01/1974 | 08/03/1958 |
| GERMANY | Signature | 30/09/1921 | |
| GERMANY | Ratification | 08/07/1924 | |
| GERMANY FEDERAL REPUBLIC | Declaration | 02/03/1976 | |
| GHANA | Succession | 07/04/1958 | |
| Gibraltar | Extension | 23/09/1922 | |
| Gilbert & Ellice Colony | Extension | 02/11/1931 | |
| GREECE | Signature | 30/09/1921 | |
| GREECE | Ratification | 09/04/1923 | |
| Grenada | Extension | 23/09/1922 | |
| Hong Kong | Accession | 23/09/1922 | |
| Hong Kong | Withdrawn | 01/07/1997 | 01/07/1997 |
| HONG KONG SAR | Application | 06/06/1997 | 01/07/1997 |
| HUNGARY | Signature | 30/09/1921 | |
| HUNGARY | Ratification | 25/04/1925 | |
| INDIA | Signature | 30/09/1921 | |
| INDIA | Declaration | 30/09/1921 | |
| INDIA | Ratification | 28/06/1922 | |
| IRAQ | Accession | 15/05/1925 | |
| IRAQ | Reservation | 15/05/1925 | |
| IRELAND, REPUBLIC OF | Accession | 18/05/1934 | |
| Italian Colonies | Extension | 27/07/1922 | |
| ITALY | Signature | 30/09/1921 | |
| ITALY | Reservation | 30/09/1921 | |
| ITALY | Ratification | 30/06/1924 | |
| Jamaica | Extension | 07/03/1924 | |
| JAMAICA | Succession | 30/07/1964 | |
| JAPAN | Signature | 30/09/1921 | |
| JAPAN | Reservation | 30/09/1921 | |
| JAPAN | Ratification | 15/12/1925 | |
| JAPAN | Declaration | 15/12/1925 | |
| JAPAN | Withdrawn | 26/03/1927 | |
| Kenya | Extension | 23/09/1922 | |
| LATVIA | Signature | 30/09/1921 | |
| LATVIA | Ratification | 12/02/1924 | |
| Leeward Islands | Extension | 07/03/1924 | |
| LIBYA | Accession | 17/02/1959 | |
| LITHUANIA | Signature | 30/09/1921 | |
| LITHUANIA | Ratification | 14/09/1931 | |
| LUXEMBOURG | Accession | 31/12/1929 | |
| Macao | Application | 11/08/1999 | |
| MACEDONIA THE FYR OF | Succession | 18/01/1994 | 17/09/1991 |
| MADAGASCAR | Accession | 18/02/1963 | |
| MALAWI | Accession | 25/02/1966 | |
| Malta | Extension | 23/09/1922 | |
| MALTA | Succession | 24/03/1967 | 21/09/1964 |
| Mauritius | Extension | 07/03/1924 | |
| MAURITIUS | Succession | 18/07/1969 | 12/03/1968 |
| MEXICO | Accession | 10/05/1932 | |
| MONACO | Accession | 18/07/1931 | |
| Nauru | Extension | 02/09/1936 | |
| NETHERLANDS THE | Signature | 30/09/1921 | |
| NETHERLANDS THE | Ratification | 19/09/1923 | |
| New Guinea | Extension | 02/09/1936 | |
| NEW ZEALAND | Signature | 30/09/1921 | |
| NEW ZEALAND | Declaration | 30/09/1921 | |
| NEW ZEALAND | Ratification | 28/06/1922 | |
| NICARAGUA | Accession | 12/12/1935 | |
| Norfolk Island | Extension | 02/09/1936 | |
| Northern Rhodesia | Extension | 23/09/1922 | |
| NORWAY | Signature | 30/09/1921 | |
| NORWAY | Ratification | 16/08/1922 | |
| Nyasaland | Extension | 23/09/1922 | |
| Palestine | Extension | 02/11/1931 | |
| Papua | Extension | 02/09/1936 | |
| PERSIA | Signature | 30/09/1921 | |
| PERSIA | Ratification | 28/03/1933 | |
| PHILIPPINES | Accession | 30/09/1954 | |
| POLAND | Signature | 30/09/1921 | |
| POLAND | Ratification | 08/10/1924 | |
| PORTUGAL | Signature | 30/09/1921 | |
| PORTUGAL | Ratification | 01/12/1923 | |
| PORTUGAL | Communication | 18/11/1999 | |
| ROUMANIA | Signature | 30/09/1921 | |
| ROUMANIA | Ratification | 05/09/1923 | |
| Sarawak | Extension | 02/11/1931 | |
| SERB-CROAT-SLOVENE STATE | Accession | 02/05/1929 | |
| Seychelles | Extension | 23/09/1922 | |
| SIAM | Signature | 30/09/1921 | |
| SIAM | Reservation | 30/09/1921 | |
| SIAM | Ratification | 13/07/1922 | |
| Sierra Leone | Extension | 16/11/1927 | |
| SIERRA LEONE | Succession | 13/03/1962 | |
| SINGAPORE | Succession | 07/06/1966 | |
| SOUTH AFRICA | Signature | 30/09/1921 | |
| SOUTH AFRICA | Ratification | 28/06/1922 | |
| Southern Rhodesia | Extension | 23/09/1922 | |
| SPAIN | Accession | 12/05/1924 | |
| St Lucia | Extension | 23/09/1922 | |
| St Vincent | Extension | 23/09/1922 | |
| Straits Settlements | Extension | 23/09/1922 | |
| SUDAN | Accession | 01/06/1932 | |
| SWEDEN | Signature | 30/09/1921 | |
| SWEDEN | Ratification | 09/06/1925 | |
| SWITZERLAND | Signature | 30/09/1921 | |
| SWITZERLAND | Reservation | 30/09/1921 | |
| SWITZERLAND | Ratification | 20/01/1926 | |
| SYRIA & GRAND LEBANON | Accession | 02/06/1930 | |
| Tanganyika | Extension | 10/04/1931 | |
| The Gambia | Extension | 10/04/1931 | |
| Trinidad And Tobago | Extension | 23/09/1922 | |
| TRINIDAD AND TOBAGO | Succession | 11/04/1966 | 31/08/1962 |
| TURKEY | Accession | 15/04/1937 | |
| Uganda | Extension | 10/04/1931 | |
| UNITED KINGDOM | Signature | 30/09/1921 | |
| UNITED KINGDOM | Ratification | 28/06/1922 | |
| URUGUAY | Accession | 21/10/1924 | |
| YUGOSLAVIA, FEDERAL REPUBLIC OF | Succession | 12/03/2001 | 27/04/1992 |
| ZAMBIA | Succession | 26/03/1973 | |
| Zanzibar | Extension | 14/01/1932 | |
| ZIMBABWE | Succession | 01/12/1998 | 18/04/1980 |