| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| ARGENTINE REPUBLIC | Accession | 16/10/1936 | |
| Australia | Accession | 30/12/1919 | |
| AUSTRALIA | Re-Application | 01/07/1954 | |
| AUSTRIA | Accession | 23/03/1921 | |
| BELGIUM | Accession | 08/12/1922 | |
| Bermuda | Accession | 19/12/1912 | |
| British East Africa | Accession | 04/01/1910 | |
| BULGARIA | Accession | 01/11/1926 | |
| Canada | Accession | 20/09/1914 | |
| CHILE | Accession | 28/01/1930 | |
| CHINA | Accession | 06/12/1923 | |
| Cyprus | Accession | 01/01/1905 | |
| CZECHOSLOVAKIA | Accession | 30/03/1921 | |
| Danish Antilles | Accession | 01/01/1905 | |
| DANZIG | Accession | 23/08/1921 | |
| DENMARK | Ratification | 01/01/1905 | |
| DENMARK | Signature | 26/09/1906 | 01/01/1912 |
| DENMARK | Re-Application | 01/10/1953 | |
| EGYPT | Accession | 07/04/1932 | |
| ESTONIA | Accession | 02/02/1923 | |
| Faroe Islands | Accession | 01/01/1905 | |
| Fiji | Accession | 20/06/1910 | |
| FIJI | Succession | 27/08/1971 | 10/10/1970 |
| FINLAND | Accession | 13/10/1921 | |
| FRANCE | Ratification | 01/01/1905 | |
| FRANCE | Signature | 26/09/1906 | 01/01/1912 |
| French Settlements In Oceania | Acceptance | 01/01/1905 | |
| French Somaliland | Accession | 01/01/1905 | |
| French West Africa | Accession | 01/01/1905 | |
| GERMANY | Re-Application | 01/01/1953 | |
| GERMANY | Re-Application | 01/10/1953 | |
| GERMANY | Ratification | 01/01/1905 | |
| GERMANY | Signature | 26/09/1906 | 01/01/1912 |
| GERMANY | Re-Application | 31/01/1974 | 17/02/1958 |
| GERMANY | Notification | 30/08/1976 | |
| Gibraltar | Accession | 01/01/1905 | |
| Gold Coast | Accession | 22/10/1910 | |
| HUNGARY | Accession | 19/11/1925 | |
| India | Accession | 30/12/1919 | |
| Indies | Extension | 07/03/1910 | |
| Irish Free State | Notification | 15/04/1926 | |
| ITALY | Signature | 26/09/1906 | 06/07/1915 |
| ITALY | Accession | 06/07/1910 | |
| IVORY COAST | Succession | 27/09/1968 | |
| JAPAN | Accession | 14/10/1921 | |
| Leeward Islands | Accession | 01/01/1905 | |
| LUXEMBOURG | Ratification | 01/01/1905 | |
| LUXEMBOURG | Signature | 26/09/1906 | 01/01/1912 |
| Madagascar And Dependencies | Accession | 01/01/1905 | |
| MALAGASY REPUBLIC | Succession | 12/08/1968 | |
| Malta | Acceptance | 01/01/1905 | |
| MALTA | Succession | 25/07/1967 | 21/09/1964 |
| Mauritius | Accession | 04/01/1910 | |
| MAURITIUS | Succession | 12/08/1970 | 12/03/1968 |
| MOROCCO | Accession | 05/07/1927 | |
| NETHERLANDS THE | Ratification | 01/01/1905 | |
| NETHERLANDS THE | Signature | 26/09/1906 | 01/01/1912 |
| New Caledonia | Accession | 01/01/1905 | |
| New Zealand | Accession | 27/11/1911 | |
| Nigeria, North | Accession | 24/02/1910 | |
| Nigeria, South | Accession | 04/01/1910 | |
| NORWAY | Accession | 10/07/1914 | |
| Orange River Colony | Accession | 01/01/1905 | |
| Palestine | Accession | 17/09/1925 | |
| PERSIA | Accession | 05/06/1933 | |
| POLAND | Accession | 14/01/1921 | |
| Reunion | Accession | 01/01/1905 | |
| ROUMANIA | Accession | 21/07/1921 | |
| Seychelles | Accession | 04/01/1910 | |
| Sierra Leone | Accession | 22/10/1910 | |
| South Africa | Accession | 03/05/1909 | |
| Southern Rhodesia | Accession | 20/02/1911 | |
| SPAIN | Accession | 29/10/1909 | 29/10/1914 |
| SWEDEN | Accession | 10/04/1920 | |
| SWITZERLAND | Ratification | 01/01/1905 | |
| SWITZERLAND | Signature | 26/09/1906 | 01/01/1912 |
| The Gambia | Accession | 22/10/1910 | |
| TUNIS | Accession | 15/01/1910 | |
| TURKEY | Accession | 17/02/1933 | |
| Uganda | Accession | 04/01/1910 | |
| UNITED KINGDOM | Re-Application | 01/01/1953 | |
| UNITED KINGDOM | Accession | 28/12/1908 | |
| YUGOSLAVIA | Accession | 24/12/1929 |