| Country | Action | Action Date | Effective Date |
|---|
| Antigua | Extension | 03/01/1913 | |
| Australia | Extension | 12/04/1912 | |
| Australia | Re-Application | 01/07/1954 | |
| AUSTRIA-HUNGARY | Signature | 04/05/1910 | |
| AUSTRIA-HUNGARY | Ratification | 24/04/1912 | |
| Bahamas | Extension | 03/01/1913 | |
| Barbados | Extension | 03/01/1913 | |
| Basutoland | Extension | 03/01/1913 | |
| Bechuanaland | Extension | 03/01/1913 | |
| Belgian Congo | Extension | 31/07/1926 | |
| BELGIUM | Signature | 04/05/1910 | |
| BELGIUM | Ratification | 15/03/1911 | |
| Bermuda | Extension | 03/01/1913 | |
| BRAZIL | Signature | 04/05/1910 | |
| BRAZIL | Ratification | 03/06/1924 | |
| British Guiana | Extension | 03/01/1913 | |
| British Honduras | Extension | 03/01/1913 | |
| British Virgin Islands | Extension | 03/01/1913 | |
| BULGARIA | Accession | 18/05/1923 | |
| Burma | Extension | 01/04/1937 | |
| Canada | Extension | 09/09/1911 | |
| Ceylon | Extension | 03/01/1913 | |
| CHINA | Notification | 08/04/1998 | |
| CHINA | Notification | 17/12/2002 | |
| CHINA | Notification | 08/01/2003 | |
| CUBA | Acceptance | 02/12/1983 | |
| Curacao | Extension | 18/11/1921 | |
| CYPRUS | Succession | 16/05/1963 | |
| CZECH REPUBLIC | Succession | 30/12/1993 | 01/01/1993 |
| CZECHOSLOVAKIA | Accession | 16/05/1921 | |
| Danish Antilles | Extension | 26/07/1912 | |
| DANZIG | Accession | 22/08/1921 | |
| DENMARK | Signature | 04/05/1910 | |
| DENMARK | Ratification | 08/04/1911 | |
| Dominica | Extension | 03/01/1913 | |
| East Indies | Extension | 18/11/1921 | |
| ESTONIA | Accession | 10/02/1924 | |
| Falkland Islands | Extension | 03/01/1913 | |
| Fiji | Extension | 03/01/1913 | |
| FIJI | Succession | 01/11/1971 | |
| FINLAND | Accession | 03/05/1923 | |
| FRANCE | Signature | 04/05/1910 | |
| FRANCE | Ratification | 15/03/1911 | |
| GERMAN DEMOCRATIC REPUBLIC | Declaration | 01/01/1905 | |
| GERMAN DEMOCRATIC REPUBLIC | Re-Application | 18/12/1958 | |
| GERMAN DEMOCRATIC REPUBLIC | Notification | 30/09/1974 | |
| GERMANY | Signature | 04/05/1910 | |
| GERMANY | Ratification | 15/03/1911 | |
| GERMANY | Declaration | 24/08/1911 | |
| GERMANY FEDERAL REPUBLIC | Declaration | 01/01/1905 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/01/1953 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/07/1954 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 20/07/1955 | |
| GHANA | Succession | 07/04/1958 | |
| Gibraltar | Extension | 03/01/1913 | |
| Gold Coast | Extension | 03/01/1913 | |
| Grenada | Extension | 03/01/1913 | |
| Hong Kong | Extension | 03/01/1913 | |
| Hong Kong | Notification | 10/06/1997 | 01/07/1997 |
| HONG KONG SAR | Application | 10/06/1997 | 01/07/1997 |
| HONG KONG SAR | Declaration | 08/04/1998 | |
| HUNGARY | Accession | 01/01/1905 | |
| ICELAND | Accession | 26/07/1912 | |
| India | Extension | 01/10/1913 | |
| ITALY | Signature | 04/05/1910 | |
| ITALY | Ratification | 15/03/1911 | |
| Kenya | Extension | 03/01/1913 | |
| Leeward Islands | Extension | 03/01/1913 | |
| LESOTHO | Succession | 28/11/1975 | |
| LIBERIA | Accession | 16/09/2005 | 16/03/2006 |
| LUXEMBOURG | Accession | 16/05/1911 | |
| MALAWI | Succession | 22/07/1965 | |
| Malay States | Extension | 03/01/1913 | |
| MALAYA | Succession | 31/08/1957 | |
| Malta | Extension | 03/01/1913 | |
| MALTA | Succession | 21/09/1964 | |
| Mauritius | Extension | 03/01/1913 | |
| MAURITIUS | Succession | 12/03/1968 | |
| Montserrat | Extension | 03/01/1913 | |
| NETHERLANDS THE | Signature | 04/05/1910 | |
| NETHERLANDS THE | Ratification | 08/06/1912 | |
| New Zealand | Extension | 30/12/1911 | |
| Newfoundland (UK) | Extension | 09/11/1911 | |
| NIGERIA | Succession | 26/06/1961 | |
| Nigeria, North | Extension | 03/01/1913 | |
| Nigeria, South | Extension | 03/01/1913 | |
| Northern Rhodesia | Extension | 03/01/1913 | |
| NORWAY | Accession | 28/01/1912 | |
| Nyasaland | Extension | 03/01/1913 | |
| POLAND | Accession | 10/01/1921 | |
| PORTUGAL | Signature | 04/05/1910 | |
| PORTUGAL | Ratification | 06/10/1911 | |
| ROUMANIA | Ratification | 07/06/1926 | |
| Ruanda Urundi | Extension | 31/07/1926 | |
| RUSSIA | Signature | 04/05/1910 | |
| RUSSIA | Ratification | 15/12/1911 | |
| Seychelles | Extension | 03/01/1913 | |
| SIAM | Accession | 13/09/1923 | |
| Sierra Leone | Extension | 03/01/1913 | |
| SIERRA LEONE | Succession | 13/03/1962 | |
| SLOVAK REPUBLIC | Succession | 28/05/1993 | 01/01/1993 |
| SOLOMON ISLANDS | Succession | 03/09/1981 | |
| Somaliland Protectorate | Extension | 03/01/1913 | |
| South Africa | Extension | 06/11/1911 | |
| Southern Rhodesia | Extension | 03/01/1913 | |
| SPAIN | Signature | 04/05/1910 | |
| SPAIN | Ratification | 15/03/1911 | |
| St Helena | Extension | 03/01/1913 | |
| St Lucia | Extension | 03/01/1913 | |
| St Vincent | Extension | 03/01/1913 | |
| St. Christopher And Nevis | Extension | 03/01/1913 | |
| Straits Settlements | Extension | 03/01/1913 | |
| Surinam | Extension | 18/11/1921 | |
| Swaziland | Extension | 03/01/1913 | |
| SWITZERLAND | Signature | 04/05/1910 | |
| SWITZERLAND | Ratification | 15/03/1911 | |
| The Gambia | Extension | 03/01/1913 | |
| Trinidad And Tobago | Extension | 03/01/1913 | |
| TRINIDAD AND TOBAGO | Succession | 31/08/1962 | |
| Uganda | Extension | 03/01/1913 | |
| UNITED KINGDOM | Signature | 04/05/1910 | |
| UNITED KINGDOM | Ratification | 15/03/1911 | |
| UNITED KINGDOM | Re-Application | 01/01/1953 | |
| UNITED STATES OF AMERICA | Signature | 04/05/1910 | |
| UNITED STATES OF AMERICA | Ratification | 15/03/1911 | |
| Weihaiwei | Extension | 03/01/1913 | |
| Windward Islands | Extension | 03/01/1913 | |
| YUGOSLAVIA, FEDERAL REPUBLIC OF | Succession | 12/03/2001 | 27/04/1992 |
| ZAMBIA | Succession | 01/11/1974 | |
| Zanzibar | Extension | 01/08/1911 | |
| ZIMBABWE | Succession | 01/12/1998 | 18/04/1980 |