| Country | Action | Action Date | Effective Date |
|---|
| ALBANIA | Accession | 02/07/1925 | |
| Algeria | Signature | 05/07/1912 | |
| Algeria | Ratification | 17/02/1914 | |
| ARGENTINE REPUBLIC | Signature | 01/01/1905 | |
| Australia | Signature | 05/07/1912 | |
| Australia | Ratification | 02/06/1913 | |
| AUSTRIA | Signature | 05/07/1912 | |
| AUSTRIA | Ratification | 12/03/1914 | |
| Bahamas | Signature | 05/07/1912 | |
| Bahamas | Ratification | 02/06/1913 | |
| Barbados | Signature | 05/07/1912 | |
| Barbados | Ratification | 02/06/1913 | |
| Basutoland | Signature | 05/07/1912 | |
| Basutoland | Ratification | 02/06/1913 | |
| Bechuanaland | Signature | 05/07/1912 | |
| Bechuanaland | Ratification | 02/06/1913 | |
| Belgian Congo | Signature | 05/07/1912 | |
| Belgian Congo | Ratification | 23/11/1912 | |
| BELGIUM | Signature | 05/07/1912 | |
| BELGIUM | Ratification | 23/11/1912 | |
| Bermuda | Signature | 05/07/1912 | |
| Bermuda | Ratification | 02/06/1913 | |
| BOLIVIA | Accession | 13/10/1915 | |
| BOSNIA AND HERZEGOVINA | Signature | 05/07/1912 | |
| BOSNIA AND HERZEGOVINA | Ratification | 12/03/1914 | |
| BRAZIL | Signature | 05/07/1912 | |
| BRAZIL | Ratification | 18/12/1914 | |
| British East Africa | Signature | 05/07/1912 | |
| British East Africa | Ratification | 02/06/1913 | |
| British Guiana | Signature | 05/07/1912 | |
| British Guiana | Ratification | 02/06/1913 | |
| British Honduras | Signature | 05/07/1912 | |
| British Honduras | Ratification | 02/06/1913 | |
| BULGARIA | Signature | 05/07/1912 | |
| BULGARIA | Ratification | 27/04/1914 | |
| CAMEROON | Accession | 07/03/1923 | |
| Canada | Signature | 05/07/1912 | |
| Canada | Ratification | 02/06/1913 | |
| Ceylon | Signature | 05/07/1912 | |
| Ceylon | Ratification | 02/06/1913 | |
| CHILE | Signature | 05/07/1912 | |
| CHILE | Ratification | 16/04/1914 | |
| CHINA | Accession | 01/09/1920 | |
| COLOMBIA | Accession | 25/08/1914 | |
| CUBA | Accession | 16/01/1918 | |
| Curacao | Signature | 05/07/1912 | |
| Curacao | Ratification | 20/03/1913 | |
| Cyprus | Signature | 05/07/1912 | |
| Cyprus | Ratification | 02/06/1913 | |
| CZECH AND SLOVAK FEDERAL REPUBLIC | Accession | 23/04/1920 | |
| DANZIG | Accession | 22/06/1921 | |
| DENMARK | Signature | 05/07/1912 | |
| DENMARK | Ratification | 14/02/1913 | |
| DOMINICAN REPUBLIC | Accession | 11/08/1926 | |
| ECUADOR | Accession | 17/04/1920 | |
| EGYPT | Signature | 05/07/1912 | |
| EGYPT | Ratification | 01/02/1913 | |
| ESTONIA | Accession | 01/07/1923 | |
| Falkland Islands | Signature | 05/07/1912 | |
| Falkland Islands | Ratification | 02/06/1913 | |
| Fiji | Signature | 05/07/1912 | |
| Fiji | Ratification | 02/06/1913 | |
| FINLAND | Accession | 05/02/1927 | |
| FRANCE | Signature | 05/07/1912 | |
| FRANCE | Ratification | 17/02/1914 | |
| French Equatorial Africa | Signature | 05/07/1912 | |
| French Equatorial Africa | Ratification | 17/02/1914 | |
| French Guiana | Accession | 05/01/1927 | |
| French Indo-china | Signature | 05/07/1912 | |
| French Indo-china | Ratification | 17/02/1914 | |
| French Oceania | Accession | 03/02/1916 | |
| French Somaliland | Accession | 23/10/1925 | |
| French Togoland | Accession | 20/10/1926 | |
| French West Africa | Signature | 05/07/1912 | |
| French West Africa | Ratification | 17/02/1914 | |
| GERMANY | Signature | 05/07/1912 | |
| GERMANY | Ratification | 21/06/1913 | |
| Gibraltar | Signature | 05/07/1912 | |
| Gibraltar | Ratification | 02/06/1913 | |
| Gold Coast | Signature | 05/07/1912 | |
| Gold Coast | Ratification | 02/06/1913 | |
| GREECE | Signature | 05/07/1912 | |
| GREECE | Ratification | 24/07/1914 | |
| GUATEMALA | Accession | 10/07/1914 | |
| HAYTI | Accession | 10/10/1927 | |
| HONDURAS | Accession | 27/10/1925 | |
| Hong Kong | Signature | 05/07/1912 | |
| Hong Kong | Ratification | 02/06/1913 | |
| HUNGARY | Signature | 05/07/1912 | |
| HUNGARY | Ratification | 12/03/1914 | |
| HUNGARY | Declaration | 14/12/1926 | |
| ICELAND | Accession | 26/02/1919 | |
| India | Signature | 05/07/1912 | |
| India | Ratification | 02/06/1913 | |
| Italian Colonies | Signature | 05/07/1912 | |
| Italian Colonies | Ratification | 18/06/1913 | |
| Jamaica | Signature | 05/07/1912 | |
| Jamaica | Ratification | 02/06/1913 | |
| JAPAN | Signature | 05/07/1912 | |
| JAPAN | Ratification | 16/07/1913 | |
| JAPAN | Accession | 05/08/1927 | |
| LATVIA | Accession | 01/01/1922 | |
| Leeward Islands | Signature | 05/07/1912 | |
| Leeward Islands | Ratification | 02/06/1913 | |
| LIBERIA | Accession | 10/10/1927 | |
| LITHUANIA | Accession | 24/01/1925 | |
| Madagascar | Signature | 05/07/1912 | |
| Madagascar | Ratification | 17/02/1914 | |
| Malay States | Signature | 05/07/1912 | |
| Malay States | Ratification | 02/06/1913 | |
| Malta | Signature | 05/07/1912 | |
| Malta | Ratification | 02/06/1913 | |
| Mauritius | Signature | 05/07/1912 | |
| Mauritius | Ratification | 02/06/1913 | |
| MEXICO | Accession | 06/10/1913 | |
| MONACO | Signature | 05/07/1912 | |
| MONACO | Ratification | 10/12/1912 | |
| MOROCCO | Signature | 05/07/1912 | |
| MOROCCO | Ratification | 02/11/1914 | |
| NETHERLANDS THE | Signature | 05/07/1912 | |
| NETHERLANDS THE | Ratification | 20/03/1913 | |
| New Zealand | Signature | 05/07/1912 | |
| New Zealand | Ratification | 02/06/1913 | |
| NICARAGUA | Accession | 12/05/1926 | |
| Nigeria, North | Signature | 05/07/1912 | |
| Nigeria, North | Ratification | 02/06/1913 | |
| North Borneo | Signature | 05/07/1912 | |
| North Borneo | Ratification | 02/06/1913 | |
| NORWAY | Signature | 05/07/1912 | |
| NORWAY | Ratification | 08/10/1913 | |
| PANAMA | Accession | 14/07/1914 | |
| PARAGUAY | Accession | 27/09/1927 | |
| PERSIA | Signature | 05/07/1912 | |
| PERU | Accession | 12/07/1915 | |
| POLAND | Accession | 07/01/1921 | |
| PORTUGAL | Signature | 05/07/1912 | |
| PORTUGAL | Ratification | 02/12/1913 | |
| Portuguese Overseas Provinces | Signature | 05/07/1912 | |
| Portuguese Overseas Provinces | Ratification | 02/12/1913 | |
| Reunion | Accession | 29/10/1923 | |
| Rhodesia | Signature | 05/07/1912 | |
| Rhodesia | Ratification | 02/06/1913 | |
| Rhodesia And Nyasaland | Signature | 05/07/1912 | |
| Rhodesia And Nyasaland | Ratification | 02/06/1913 | |
| ROUMANIA | Signature | 05/07/1912 | |
| ROUMANIA | Ratification | 27/06/1913 | |
| RUSSIA | Signature | 05/07/1912 | |
| RUSSIA | Ratification | 05/04/1913 | |
| SALVADOR | Accession | 12/10/1927 | |
| SAN MARINO | Signature | 05/07/1912 | |
| SAN MARINO | Ratification | 01/08/1913 | |
| SERB-CROAT-SLOVENE STATE | Accession | 17/06/1919 | |
| Seychelles | Signature | 05/07/1912 | |
| Seychelles | Ratification | 02/06/1913 | |
| SIAM | Signature | 05/07/1912 | |
| SIAM | Ratification | 30/05/1913 | |
| Sierra Leone | Signature | 05/07/1912 | |
| Sierra Leone | Ratification | 02/06/1913 | |
| Somaliland Protectorate | Signature | 05/07/1912 | |
| Somaliland Protectorate | Ratification | 02/06/1913 | |
| South Africa | Signature | 05/07/1912 | |
| South Africa | Ratification | 02/06/1913 | |
| Southern Rhodesia | Signature | 05/07/1912 | |
| Southern Rhodesia | Ratification | 02/06/1913 | |
| SPAIN | Signature | 05/07/1912 | |
| SPAIN | Ratification | 27/06/1913 | |
| Spanish Colonies | Signature | 05/07/1912 | |
| Spanish Colonies | Ratification | 27/06/1913 | |
| St Helena | Signature | 05/07/1912 | |
| St Helena | Ratification | 02/06/1913 | |
| St Pierre and Miquelon | Accession | 13/05/1926 | |
| Straits Settlements | Signature | 05/07/1912 | |
| Straits Settlements | Ratification | 02/06/1913 | |
| SURINAME | Accession | 17/12/1925 | |
| Swaziland | Signature | 05/07/1912 | |
| Swaziland | Ratification | 02/06/1913 | |
| SWEDEN | Signature | 05/07/1912 | |
| SWEDEN | Ratification | 08/08/1913 | |
| SYRIA & GRAND LEBANON | Accession | 13/05/1926 | |
| The Gambia | Signature | 05/07/1912 | |
| The Gambia | Ratification | 02/06/1913 | |
| Trinidad And Tobago | Signature | 05/07/1912 | |
| Trinidad And Tobago | Ratification | 02/06/1913 | |
| TRIPOLI | Accession | 13/01/1914 | |
| Tunis | Signature | 05/07/1912 | |
| Tunis | Ratification | 17/02/1914 | |
| TURKEY | Accession | 30/08/1926 | |
| Uganda | Signature | 05/07/1912 | |
| Uganda | Ratification | 02/06/1913 | |
| UNITED KINGDOM | Signature | 05/07/1912 | |
| UNITED KINGDOM | Ratification | 02/06/1913 | |
| UNITED STATES OF AMERICA | Signature | 05/07/1912 | |
| UNITED STATES OF AMERICA | Ratification | 21/02/1913 | |
| UNITED STATES OF AMERICA | Reservation | 21/02/1913 | |
| URUGUAY | Signature | 05/07/1912 | |
| URUGUAY | Ratification | 29/02/1916 | |
| USA Responsible Territories | Signature | 05/07/1912 | |
| USA Responsible Territories | Ratification | 21/02/1913 | |
| VENEZUELA | Accession | 13/08/1920 | |
| Weihaiwei | Signature | 05/07/1912 | |
| Weihaiwei | Ratification | 02/06/1913 | |
| Western Pacific High Commsn Territories | Signature | 05/07/1912 | |
| Western Pacific High Commsn Territories | Ratification | 02/06/1913 | |
| Windward Islands | Signature | 05/07/1912 | |
| Windward Islands | Ratification | 02/06/1913 | |