| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| Aden Colony | Extension | 01/01/1905 | |
| ALBANIA | Accession | 01/05/1934 | |
| ALGERIA | Accession | 15/08/1931 | |
| ANGOLA | Accession | 16/05/1931 | |
| ARGENTINE REPUBLIC | Accession | 29/01/1935 | |
| AUSTRIA | Signature | 24/04/1926 | |
| AUSTRIA | Ratification | 12/09/1930 | |
| Bahamas | Extension | 01/06/1939 | |
| Basutoland | Extension | 14/06/1934 | |
| Bechuanaland | Extension | 14/06/1934 | |
| Belgian Congo | Extension | 22/12/1930 | |
| BELGIUM | Signature | 24/04/1926 | |
| BELGIUM | Ratification | 24/10/1929 | |
| Bharain | Extension | 18/05/1951 | 18/05/1952 |
| BRAZIL | Signature | 24/04/1926 | |
| BRAZIL | Ratification | 03/12/1929 | |
| British Honduras | Extension | 17/03/1937 | |
| BULGARIA | Signature | 24/04/1926 | |
| BULGARIA | Ratification | 24/10/1929 | |
| BURMA | Succession | 01/01/1905 | |
| Ceylon | Extension | 14/08/1931 | |
| CHILE | Accession | 15/10/1929 | |
| CUBA | Signature | 24/04/1926 | |
| CUBA | Ratification | 24/10/1929 | |
| Curacao | Extension | 29/01/1935 | |
| Cyprus | Extension | 29/04/1931 | |
| CZECHOSLOVAKIA | Signature | 24/04/1926 | |
| CZECHOSLOVAKIA | Ratification | 18/09/1930 | |
| DANZIG | Signature | 24/04/1926 | |
| DANZIG | Ratification | 10/01/1932 | |
| DENMARK | Signature | 30/06/1926 | |
| DENMARK | Ratification | 12/02/1930 | |
| EGYPT | Signature | 24/04/1926 | |
| EGYPT | Ratification | 24/10/1929 | |
| ESTONIA | Signature | 24/04/1926 | |
| ESTONIA | Ratification | 24/10/1929 | |
| FINLAND | Signature | 24/04/1926 | |
| FINLAND | Ratification | 24/10/1929 | |
| FRANCE | Signature | 24/04/1926 | |
| FRANCE | Ratification | 24/10/1929 | |
| French Cameroons | Extension | 10/03/1927 | |
| French Equatorial Africa | Extension | 30/06/1926 | |
| French Guiana | Extension | 30/06/1926 | |
| French India | Extension | 30/06/1926 | |
| French Indo-china | Extension | 30/06/1926 | |
| French Settlements In Oceania | Extension | 10/03/1927 | |
| French Somaliland | Extension | 11/09/1926 | |
| French Togoland | Extension | 30/06/1926 | |
| French West Africa | Extension | 30/06/1926 | |
| GERMANY | Signature | 24/04/1926 | |
| GERMANY | Ratification | 13/12/1929 | |
| GERMANY FEDERAL REPUBLIC | Re-Application | 01/01/1953 | |
| Gibraltar | Extension | 04/12/1929 | |
| Gold Coast | Extension | 29/04/1931 | |
| GREECE | Signature | 24/04/1926 | |
| GREECE | Ratification | 24/10/1929 | |
| Guadeloupe | Extension | 11/09/1926 | |
| GUATEMALA | Signature | 24/04/1926 | |
| Hong Kong | Extension | 29/04/1931 | |
| HUNGARY | Signature | 24/04/1926 | |
| HUNGARY | Ratification | 24/10/1929 | |
| ICELAND | Accession | 01/03/1936 | 01/03/1936 |
| India | Extension | 28/10/1929 | |
| IRAQ | Accession | 04/12/1929 | |
| IRELAND, REPUBLIC OF | Signature | 30/06/1926 | |
| IRELAND, REPUBLIC OF | Ratification | 24/10/1929 | |
| ITALY | Signature | 24/04/1926 | |
| ITALY | Ratification | 24/10/1929 | |
| ITALY | Declaration | 10/02/1931 | |
| Jamaica | Extension | 29/04/1931 | |
| Kenya | Extension | 29/04/1931 | |
| Kuwait | Extension | 18/05/1951 | 18/05/1952 |
| LATVIA | Signature | 24/10/1929 | |
| LIECHTENSTEIN | Accession | 19/09/1931 | 01/01/1932 |
| LITHUANIA | Signature | 24/04/1926 | |
| LITHUANIA | Ratification | 20/10/1930 | |
| LUXEMBOURG | Signature | 24/04/1926 | |
| LUXEMBOURG | Ratification | 24/10/1929 | |
| Madagascar | Extension | 30/06/1926 | |
| Malay States | Extension | 24/10/1931 | |
| Malta | Extension | 04/12/1929 | |
| Martinique | Extension | 30/06/1926 | |
| Mauritius | Extension | 10/04/1937 | |
| MEXICO | Signature | 24/04/1926 | |
| MEXICO | Ratification | 07/03/1940 | |
| MONACO | Signature | 24/04/1926 | |
| MONACO | Ratification | 24/10/1929 | |
| MOROCCO | Signature | 24/04/1926 | |
| MOROCCO | Ratification | 24/10/1929 | |
| Morocco | Extension | 08/01/1934 | |
| MOZAMBIQUE | Accession | 31/12/1931 | |
| NETHERLANDS THE | Signature | 24/04/1926 | |
| NETHERLANDS THE | Ratification | 24/10/1929 | |
| New Caledonia | Extension | 11/09/1926 | |
| Newfoundland (UK) | Extension | 20/10/1937 | |
| Nigeria | Extension | 14/03/1936 | |
| North Borneo | Extension | 17/03/1937 | |
| Northern Rhodesia | Extension | 29/04/1931 | |
| NORWAY | Signature | 24/04/1924 | |
| NORWAY | Ratification | 24/10/1929 | |
| Nyasaland | Extension | 29/04/1931 | |
| Palestine | Extension | 04/12/1929 | |
| PERSIA | Signature | 24/04/1926 | |
| PERSIA | Ratification | 18/04/1935 | |
| PERU | Signature | 24/04/1926 | |
| PERU | Ratification | 05/11/1936 | |
| POLAND | Signature | 24/04/1926 | |
| POLAND | Ratification | 24/10/1929 | |
| PORTUGAL | Signature | 24/04/1926 | |
| PORTUGAL | Ratification | 24/10/1929 | |
| Reunion | Extension | 11/09/1926 | |
| ROUMANIA | Signature | 24/04/1926 | |
| ROUMANIA | Ratification | 24/10/1929 | |
| Ruanda Urundi | Extension | 22/12/1930 | |
| SAAR TERRITORY | Signature | 24/04/1926 | |
| SAAR TERRITORY | Ratification | 24/10/1929 | |
| SAN MARINO | Accession | 09/06/1931 | |
| SERB-CROAT-SLOVENE STATE | Signature | 24/04/1926 | |
| SERB-CROAT-SLOVENE STATE | Ratification | 24/10/1929 | |
| Seychelles | Extension | 17/03/1937 | |
| SIAM | Signature | 24/04/1926 | |
| SIAM | Ratification | 24/10/1929 | |
| Sierra Leone | Extension | 14/03/1936 | |
| Somaliland Protectorate | Extension | 17/03/1937 | |
| SOUTH AFRICA | Accession | 31/12/1932 | |
| South West Africa | Extension | 01/04/1935 | |
| Southern Rhodesia | Extension | 29/01/1931 | |
| SOVIET UNION | Signature | 24/04/1926 | |
| SOVIET UNION | Ratification | 24/10/1929 | |
| SPAIN | Signature | 24/04/1926 | |
| SPAIN | Ratification | 24/10/1929 | |
| Straits Settlements | Extension | 24/10/1931 | |
| Surinam | Extension | 29/01/1935 | |
| Swaziland | Extension | 14/06/1934 | |
| SWEDEN | Accession | 12/07/1927 | |
| SWITZERLAND | Signature | 24/04/1926 | |
| SWITZERLAND | Ratification | 21/10/1930 | |
| SYRIA & GRAND LEBANON | Accession | 26/05/1930 | |
| Tanganyika | Extension | 29/04/1931 | |
| TANGIER | Accession | 10/05/1932 | |
| The Gambia | Extension | 29/04/1931 | |
| Trinidad And Tobago | Extension | 17/03/1937 | |
| Tungganu | Extension | 04/03/1934 | |
| TUNIS | Signature | 24/04/1926 | |
| TUNIS | Ratification | 24/10/1929 | |
| TURKEY | Signature | 24/04/1924 | |
| TURKEY | Ratification | 31/05/1934 | |
| Uganda | Extension | 29/04/1931 | |
| UNITED KINGDOM | Signature | 24/04/1926 | |
| UNITED KINGDOM | Ratification | 24/10/1929 | |
| UNITED KINGDOM | Declaration | 01/01/1953 | |
| URUGUAY | Ratification | 24/10/1929 | |
| URUGUAY | Signature | 24/04/1998 | |
| VATICAN CITY | Accession | 07/02/1930 | |
| Windward Islands | Extension | 29/04/1931 | |
| Zanzibar | Extension | 29/04/1931 |