| Country | Action | Action Date | Effective Date |
|---|
| ARGENTINE REPUBLIC | Signature | 25/11/1927 | |
| ARGENTINE REPUBLIC | Ratification | 15/05/1933 | |
| Australia | Signature | 25/11/1927 | |
| Australia | Ratification | 03/04/1929 | |
| AUSTRIA | Signature | 25/11/1927 | |
| AUSTRIA | Ratification | 29/12/1928 | |
| Bahamas | Extension | 15/08/1930 | |
| Barbados | Extension | 15/08/1930 | |
| Basutoland | Extension | 15/08/1930 | |
| Bechuanaland | Extension | 15/08/1930 | |
| Belgian Congo | Extension | 15/12/1928 | |
| BELGIUM | Signature | 25/11/1927 | |
| BELGIUM | Ratification | 15/12/1928 | |
| Bermuda | Extension | 15/08/1930 | |
| BOLIVIA | Signature | 25/11/1927 | |
| BRAZIL | Signature | 25/11/1927 | |
| BRAZIL | Ratification | 27/10/1931 | |
| British Guiana | Extension | 15/08/1930 | |
| British Honduras | Extension | 15/08/1930 | |
| BULGARIA | Signature | 25/11/1927 | |
| BULGARIA | Ratification | 22/07/1929 | |
| Canada | Signature | 25/11/1927 | |
| Canada | Ratification | 29/10/1928 | |
| Ceylon | Extension | 15/08/1930 | |
| CHILE | Signature | 25/11/1927 | |
| CHILE | Ratification | 27/02/1930 | |
| CHINA | Signature | 25/11/1927 | |
| CHINA | Ratification | 23/06/1930 | |
| COLOMBIA | Signature | 25/11/1927 | |
| COSTA RICA | Signature | 25/11/1927 | |
| COSTA RICA | Ratification | 13/09/1932 | |
| CUBA | Signature | 25/11/1927 | |
| CUBA | Ratification | 20/12/1930 | |
| CUBA | Ratification | 04/02/1931 | |
| Curacao | Extension | 29/10/1928 | |
| Cyprus | Extension | 15/08/1930 | |
| CZECHOSLOVAKIA | Signature | 25/11/1927 | |
| CZECHOSLOVAKIA | Ratification | 01/03/1929 | |
| DANZIG | Accession | 13/02/1930 | |
| DENMARK | Signature | 25/11/1927 | |
| DENMARK | Ratification | 15/11/1928 | |
| DOMINICAN REPUBLIC | Signature | 25/11/1927 | |
| DOMINICAN REPUBLIC | Ratification | 09/04/1932 | |
| East Indies | Extension | 29/10/1928 | |
| EGYPT | Signature | 25/11/1927 | |
| EGYPT | Ratification | 24/08/1932 | |
| ERITREA | Signature | 25/11/1927 | |
| ESTONIA | Signature | 25/11/1927 | |
| ESTONIA | Ratification | 22/03/1929 | |
| Falkland Island Dependencies | Extension | 15/08/1930 | |
| Falkland Islands | Extension | 15/08/1930 | |
| Fiji | Extension | 15/08/1930 | |
| FINLAND | Signature | 25/11/1927 | |
| FINLAND | Ratification | 24/01/1929 | |
| FRANCE | Signature | 25/11/1927 | |
| FRANCE | Ratification | 05/01/1934 | |
| French Equatorial Africa | Extension | 05/01/1934 | |
| French Indo-china | Extension | 01/05/1934 | |
| French West Indies | Extension | 05/01/1934 | |
| GERMANY | Signature | 25/11/1927 | |
| GERMANY | Ratification | 22/08/1929 | |
| Gibraltar | Extension | 15/08/1930 | |
| Gilbert & Ellice Colony | Extension | 15/08/1930 | |
| Gold Coast | Extension | 15/08/1930 | |
| GREECE | Signature | 25/11/1927 | |
| GREECE | Ratification | 16/04/1930 | |
| GUATEMALA | Signature | 25/11/1927 | |
| GUATEMALA | Ratification | 08/08/1930 | |
| Guinea, Colony of Gulf of | Extension | 31/01/1929 | |
| HAITI | Signature | 23/11/1927 | |
| HONDURAS | Signature | 25/11/1927 | |
| Hong Kong | Extension | 15/08/1930 | |
| HUNGARY | Signature | 25/11/1927 | |
| HUNGARY | Ratification | 20/02/1929 | |
| ICELAND | Accession | 28/12/1929 | |
| India | Signature | 15/08/1927 | |
| India | Ratification | 29/12/1928 | |
| IRAQ | Accession | 12/10/1931 | |
| Irish Free State | Signature | 25/11/1927 | |
| Irish Free State | Ratification | 14/01/1929 | |
| ITALY | Signature | 25/11/1927 | |
| ITALY | Ratification | 18/01/1929 | |
| Jamaica | Extension | 15/08/1930 | |
| JAPAN | Signature | 25/11/1927 | |
| JAPAN | Ratification | 31/01/1929 | |
| Kenya | Extension | 15/08/1930 | |
| LATVIA | Accession | 04/05/1929 | |
| Leeward Islands | Extension | 15/08/1930 | |
| LIBERIA | Signature | 25/11/1927 | |
| LIBERIA | Ratification | 05/06/1930 | |
| LUXEMBOURG | Accession | 02/04/1931 | |
| Madagascar | Extension | 05/01/1934 | |
| Malay States, Federated | Extension | 15/08/1930 | |
| Malay States, Unfederated | Extension | 15/08/1930 | |
| Malta | Extension | 15/08/1930 | |
| Mauritius | Extension | 15/08/1930 | |
| MEXICO | Signature | 28/03/1929 | |
| Morocco | Extension | 04/04/1922 | |
| NETHERLANDS THE | Signature | 25/11/1927 | |
| NETHERLANDS THE | Ratification | 29/10/1928 | |
| New Hebrides | Extension | 22/10/1930 | |
| New Zealand | Signature | 25/11/1927 | |
| New Zealand | Ratification | 07/02/1929 | |
| Newfoundland (UK) | Extension | 07/07/1930 | |
| NICARAGUA | Signature | 26/09/1932 | |
| Nigeria | Extension | 15/08/1930 | |
| North Borneo | Extension | 15/08/1930 | |
| Northern Rhodesia | Extension | 15/08/1930 | |
| NORWAY | Signature | 25/11/1927 | |
| NORWAY | Ratification | 29/10/1928 | |
| Nyasaland | Extension | 15/08/1930 | |
| Palestine | Extension | 15/08/1930 | |
| PANAMA | Signature | 25/11/1927 | |
| PANAMA | Ratification | 20/01/1933 | |
| PARAGUAY | Signature | 25/11/1927 | |
| PERSIA | Signature | 25/11/1927 | |
| PERSIA | Ratification | 07/02/1930 | |
| PERU | Signature | 25/11/1927 | |
| POLAND | Signature | 25/11/1927 | |
| POLAND | Ratification | 30/11/1932 | |
| PORTUGAL | Signature | 25/11/1927 | |
| PORTUGAL | Ratification | 25/07/1929 | |
| Portugal, Provinces In West Africa | Extension | 25/07/1929 | |
| Provs in E.Africa, Asia and Oceania | Extension | 25/07/1929 | |
| ROUMANIA | Signature | 25/11/1927 | |
| ROUMANIA | Ratification | 04/11/1930 | |
| Ruanda Urundi | Extension | 15/12/1928 | |
| SALVADOR | Signature | 25/11/1927 | |
| SAN MARINO | Signature | 25/11/1927 | |
| Sarawak | Extension | 15/08/1930 | |
| SERB-CROAT-SLOVENE STATE | Signature | 25/11/1927 | |
| SERB-CROAT-SLOVENE STATE | Ratification | 05/12/1929 | |
| Seychelles | Extension | 15/08/1930 | |
| SIAM | Signature | 25/11/1927 | |
| SIAM | Ratification | 01/07/1929 | |
| Sierra Leone | Extension | 15/08/1930 | |
| Solomon Islands Protectorate | Extension | 15/08/1930 | |
| Somaliland | Extension | 18/01/1929 | |
| Somaliland Protectorate | Extension | 15/08/1930 | |
| South Africa | Signature | 25/11/1927 | |
| South Africa | Ratification | 31/01/1929 | |
| Southern Rhodesia | Extension | 07/07/1930 | |
| SPAIN | Signature | 25/01/1927 | |
| SPAIN | Ratification | 31/01/1929 | |
| St Helena And Ascension | Extension | 15/08/1930 | |
| Straits Settlements | Extension | 15/08/1930 | |
| Surinam | Extension | 29/10/1928 | |
| Swaziland | Extension | 15/08/1930 | |
| SWEDEN | Signature | 25/11/1927 | |
| SWEDEN | Ratification | 01/03/1929 | |
| SWITZERLAND | Signature | 25/11/1927 | |
| SWITZERLAND | Ratification | 18/08/1932 | |
| SYRIA & GRAND LEBANON | Signature | 25/11/1927 | |
| SYRIA & GRAND LEBANON | Ratification | 12/03/1929 | |
| Tanganyika | Extension | 15/08/1930 | |
| The Gambia | Extension | 15/08/1930 | |
| Tonga | Extension | 15/08/1930 | |
| Trinidad And Tobago | Extension | 15/08/1930 | |
| Tripoli | Extension | 18/01/1929 | |
| TUNIS | Signature | 25/11/1927 | |
| TUNIS | Ratification | 27/06/1934 | |
| TURKEY | Signature | 26/01/1933 | |
| Uganda | Extension | 15/08/1930 | |
| UNITED KINGDOM | Signature | 25/11/1927 | |
| UNITED KINGDOM | Ratification | 29/12/1928 | |
| UNITED KINGDOM | Declaration | 07/07/1930 | |
| UNITED KINGDOM | Declaration | 15/08/1930 | |
| UNITED STATES OF AMERICA | Signature | 25/11/1927 | |
| UNITED STATES OF AMERICA | Ratification | 08/10/1928 | |
| URUGUAY | Signature | 25/11/1927 | |
| VATICAN CITY | Accession | 03/01/1931 | |
| VENEZUELA | Signature | 25/11/1927 | |
| VENEZUELA | Ratification | 10/09/1929 | |
| Windward Islands | Extension | 15/08/1930 | |
| Zanzibar | Extension | 15/08/1930 | |