| Country | Action | Action Date | Effective Date |
|---|
| AFGHANISTAN | Accession | 05/05/1944 | |
| ALBANIA | Signature | 03/02/1925 | |
| Antilles | Extension | | 01/01/1986 |
| ARGENTINE REPUBLIC | Signature | 17/10/1912 | |
| Aruba | Extension | | 01/01/1986 |
| Australia | Accession | 25/06/1913 | |
| Bahamas | Extension | 14/11/1913 | |
| BAHAMAS | Succession | 13/08/1975 | |
| Barbados | Accession | 04/04/1914 | |
| Basutoland | Extension | 28/03/1914 | |
| Bechuanaland | Extension | 28/03/1914 | |
| Belgian Congo | Accession | 29/07/1942 | |
| BELGIUM | Signature | 18/06/1912 | |
| BELGIUM | Ratification | 16/06/1914 | |
| BELGIUM | Declaration | 14/05/1919 | |
| Bermuda | Extension | 11/06/1914 | |
| BOLIVIA | Signature | 04/06/1913 | |
| BOLIVIA | Ratification | 10/01/1920 | |
| BOLIVIA | Declaration | 10/01/1920 | |
| BRAZIL | Signature | 16/10/1912 | |
| BRAZIL | Ratification | 23/12/1914 | |
| BRAZIL | Declaration | 10/01/1920 | |
| British East Africa | Accession | 17/12/1912 | |
| British Guiana | Accession | 11/02/1914 | |
| British Honduras | Accession | 11/02/1914 | |
| Brunei | Accession | 17/12/1912 | |
| BULGARIA | Signature | 02/03/1914 | |
| BULGARIA | Ratification | 09/08/1920 | |
| BULGARIA | Declaration | 09/08/1920 | |
| Burma | Extension | 01/04/1937 | |
| CAMBODIA | Accession | 03/10/1951 | |
| CAMEROON | Succession | 20/11/1961 | |
| Canada | Accession | 17/12/1912 | |
| CENTRAL AFRICAN REPUBLIC | Succession | 04/09/1962 | |
| Ceylon | Signature | 23/01/1912 | |
| Ceylon | Ratification | 15/07/1914 | |
| CHILE | Signature | 02/07/1913 | |
| CHILE | Ratification | 16/01/1923 | |
| CHINA | Signature | 23/01/1912 | |
| CHINA | Ratification | 09/02/1914 | |
| CHINA | Signature | 11/02/1915 | |
| COLOMBIA | Signature | 15/01/1913 | |
| COLOMBIA | Ratification | 26/01/1924 | |
| CONGO, REPUBLIC OF | Succession | 15/10/1962 | |
| COSTA RICA | Signature | 25/04/1912 | |
| CUBA | Signature | 08/05/1913 | |
| CUBA | Ratification | 08/03/1920 | |
| CUBA | Declaration | 08/03/1920 | |
| Cyprus | Extension | 17/12/1912 | |
| CYPRUS | Succession | 16/05/1963 | |
| CZECH REPUBLIC | Succession | 30/12/1993 | 01/01/1993 |
| Danish Antilles | Signature | 17/12/1912 | |
| Danish Antilles | Ratification | 10/07/1913 | |
| Danish Antilles | Declaration | 21/10/1921 | |
| DANZIG | Signature | 08/11/1921 | |
| DANZIG | Ratification | 18/04/1922 | |
| DOMINICAN REPUBLIC | Signature | 12/11/1912 | |
| DOMINICAN REPUBLIC | Signature | 14/04/1931 | |
| ECUADOR | Signature | 02/07/1912 | |
| ECUADOR | Ratification | 25/02/1915 | |
| ECUADOR | Signature | 23/08/1923 | |
| EGYPT | Accession | 05/06/1942 | |
| ESTONIA | Signature | 09/01/1923 | |
| ETHIOPIA | Accession | 28/12/1948 | |
| Falkland Islands | Accession | 17/12/1912 | |
| Fiji | Accession | 27/02/1913 | |
| Fiji | Succession | 01/11/1971 | |
| FIJI | Succession | 01/11/1971 | |
| FINLAND | Signature | 01/12/1922 | |
| FRANCE | Signature | 23/01/1912 | |
| FRANCE | Ratification | 10/01/1920 | |
| FRANCE | Declaration | 10/01/1920 | |
| GERMAN DEMOCRATIC REPUBLIC | Re-Application | | 16/12/1957 |
| GERMAN DEMOCRATIC REPUBLIC | Application | 21/11/1957 | |
| GERMANY | Signature | 23/01/1912 | |
| GERMANY | Ratification | 10/01/1920 | |
| GERMANY | Declaration | 10/01/1920 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/01/1953 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/10/1953 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/01/1954 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 02/02/1954 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/07/1954 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 20/07/1955 | |
| GERMANY FEDERAL REPUBLIC | Application | 04/12/1957 | |
| GERMANY FEDERAL REPUBLIC | Communication | 16/03/1976 | |
| GHANA | Accession | 03/04/1958 | |
| Gibraltar | Accession | 17/12/1912 | |
| Gilbert & Ellice Colony | Accession | 22/04/1913 | |
| Gold Coast | Accession | 17/12/1912 | |
| GREECE | Accession | 30/03/1920 | |
| Grenada | Accession | 14/11/1913 | |
| GUATEMALA | Signature | 17/06/1912 | |
| GUATEMALA | Ratification | 27/08/1913 | |
| GUATEMALA | Declaration | 10/01/1920 | |
| HAITI | Signature | 18/06/1912 | |
| HAITI | Ratification | 30/06/1920 | |
| HONDURAS | Signature | 05/07/1912 | |
| HONDURAS | Ratification | 29/08/1913 | |
| HONDURAS | Declaration | 03/04/1915 | |
| Hong Kong | Signature | 23/01/1912 | |
| Hong Kong | Ratification | 15/07/1914 | |
| India | Signature | 23/01/1912 | |
| India | Ratification | 15/07/1914 | |
| INDONESIA | Accession | 29/05/1958 | |
| Irak | Extension | 20/10/1924 | |
| ISRAEL | Accession | 12/05/1952 | |
| ITALY | Signature | 23/01/1912 | |
| ITALY | Ratification | 28/06/1914 | |
| ITALY | Declaration | 10/01/1920 | |
| IVORY COAST | Succession | 08/12/1961 | |
| Jamaica | Extension | 17/12/1912 | |
| JAMAICA | Succession | 26/12/1963 | |
| JAPAN | Signature | 23/01/1912 | |
| JAPAN | Ratification | 10/01/1920 | |
| JAPAN | Declaration | 10/01/1920 | |
| Johore | Accession | 17/12/1912 | |
| JORDAN | Accession | 12/05/1958 | |
| LAOS | Accession | 07/10/1950 | |
| LATVIA | Signature | 06/02/1922 | |
| LATVIA | Ratification | 25/03/1924 | |
| LEBANON | Accession | 24/05/1954 | |
| Leeward Islands | Accession | 30/01/1914 | |
| LESOTHO | Succession | 04/11/1974 | |
| LITHUANIA | Signature | 07/04/1922 | |
| LUXEMBOURG | Signature | 18/05/1912 | |
| LUXEMBOURG | Declaration | 14/05/1919 | |
| MALAWI | Succession | 22/07/1965 | |
| Malay States | Accession | 17/12/1912 | |
| Malta | Extension | 17/12/1912 | |
| MALTA | Succession | 21/09/1964 | |
| Mauritius | Extension | 08/04/1914 | |
| MAURITIUS | Succession | 12/03/1968 | |
| MAURITIUS | Reservation | 12/03/1968 | |
| MEXICO | Signature | 15/05/1912 | |
| MONACO | Ratification | 20/02/1920 | |
| MONACO | Signature | 01/05/1923 | |
| MONTENEGRO | Signature | 22/12/1913 | |
| NETHERLANDS THE | Signature | 23/01/1912 | |
| NETHERLANDS THE | Ratification | 28/07/1914 | |
| NETHERLANDS THE | Declaration | 11/02/1915 | |
| New Hebrides | Extension | 21/08/1924 | |
| New Zealand | Accession | 17/12/1912 | |
| Newfoundland (UK) | Accession | 17/12/1912 | |
| NICARAGUA | Signature | 18/07/1913 | |
| NICARAGUA | Ratification | 10/11/1914 | |
| NICARAGUA | Declaration | 03/11/1920 | |
| NIGER | Succession | 25/08/1961 | |
| NIGERIA | Succession | 26/06/1961 | |
| Nigeria, North | Extension | 17/12/1912 | |
| Nigeria, South | Extension | 17/12/1912 | |
| North Borneo | Accession | 17/12/1912 | |
| Northern Rhodesia | Extension | 28/03/1914 | |
| NORWAY | Signature | 02/09/1913 | |
| NORWAY | Ratification | 12/11/1914 | |
| NORWAY | Declaration | 20/09/1915 | |
| Nyasaland | Accession | 17/12/1912 | |
| Palestine | Extension | 21/08/1924 | |
| PANAMA | Signature | 19/06/1912 | |
| PANAMA | Ratification | 25/11/1920 | |
| PANAMA | Declaration | 25/11/1920 | |
| PAPUA NEW GUINEA | Succession | 28/10/1980 | |
| PARAGUAY | Signature | 14/12/1912 | |
| PARAGUAY | Accession | 17/03/1943 | |
| Perlis | Accession | 17/12/1912 | |
| PERSIA | Signature | 23/01/1912 | |
| PERU | Signature | 24/07/1913 | |
| PERU | Ratification | 10/01/1920 | |
| PERU | Declaration | 10/01/1920 | |
| PHILIPPINES | Succession | 30/09/1959 | |
| PORTUGAL | Signature | 23/01/1912 | |
| PORTUGAL | Ratification | 15/12/1913 | |
| PORTUGAL | Declaration | 08/04/1920 | |
| ROUMANIA | Signature | 27/12/1913 | |
| ROUMANIA | Ratification | 14/09/1920 | |
| ROUMANIA | Declaration | 14/09/1920 | |
| Ruanda Urundi | Accession | 29/07/1942 | |
| RUSSIA | Signature | 23/01/1912 | |
| RWANDA | Succession | 05/05/1964 | |
| SALVADOR | Signature | 30/07/1912 | |
| SALVADOR | Ratification | 30/07/1927 | |
| Sarawak | Accession | 17/12/1912 | |
| SAUDI ARABIA | Accession | 19/02/1943 | |
| SENEGAL | Succession | 02/05/1963 | |
| Seychelles | Accession | 17/12/1912 | |
| SIAM | Signature | 23/01/1912 | |
| SIAM | Ratification | 10/07/1913 | |
| SIAM | Declaration | 10/01/1920 | |
| Sierra Leone | Accession | 22/04/1913 | |
| SLOVAK REPUBLIC | Succession | 28/05/1993 | 01/01/1993 |
| Solomon Islands Protectorate | Accession | 22/04/1913 | |
| Somaliland | Accession | 17/12/1912 | |
| South Africa | Accession | 11/03/1914 | |
| Southern Rhodesia | Extension | 28/03/1914 | |
| SPAIN | Signature | 23/10/1912 | |
| SPAIN | Ratification | 25/01/1919 | |
| SPAIN | Declaration | 11/02/1921 | |
| St Helena | Accession | 17/12/1912 | |
| St Lucia | Accession | 14/11/1913 | |
| St Vincent | Accession | 14/11/1913 | |
| Straits Settlements | Signature | 23/01/1912 | |
| Straits Settlements | Ratification | 15/07/1914 | |
| Swaziland | Extension | 28/03/1914 | |
| SWEDEN | Signature | 27/08/1913 | |
| SWEDEN | Ratification | 17/04/1914 | |
| SWEDEN | Declaration | 13/01/1921 | |
| SWITZERLAND | Signature | 29/12/1913 | |
| SWITZERLAND | Ratification | 15/01/1925 | |
| SYRIA | Accession | 20/01/1954 | |
| The Gambia | Accession | 17/12/1912 | |
| Trenganu | Accession | 17/12/1912 | |
| Trinidad | Extension | 17/12/1912 | |
| TRINIDAD AND TOBAGO | Succession | 11/04/1966 | |
| TURKEY | Signature | 15/09/1933 | |
| TURKEY | Ratification | 15/09/1933 | |
| Uganda | Accession | 17/12/1912 | |
| UNITED KINGDOM | Signature | 23/01/1912 | |
| UNITED KINGDOM | Ratification | 15/07/1914 | |
| UNITED STATES OF AMERICA | Signature | 23/01/1912 | |
| UNITED STATES OF AMERICA | Ratification | 15/12/1913 | |
| UNITED STATES OF AMERICA | Declaration | 11/02/1915 | |
| URUGUAY | Signature | 09/03/1914 | |
| URUGUAY | Ratification | 03/04/1916 | |
| URUGUAY | Declaration | 10/01/1920 | |
| VENEZUELA | Signature | 10/09/1912 | |
| VENEZUELA | Ratification | 28/10/1913 | |
| VIETNAM | Accession | 11/08/1950 | |
| Weihaiwei | Signature | 23/01/1912 | |
| Weihaiwei | Ratification | 15/07/1914 | |
| Windward Islands | Accession | 14/11/1913 | |
| YUGOSLAVIA | Succession | 31/07/2002 | 17/04/1992 |
| ZAMBIA | Succession | 09/04/1973 | 24/10/1964 |
| Zanzibar | Extension | 28/03/1914 | |