| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| Algeria | Extension | 01/12/1921 | |
| Antigua | Extension | 01/12/1921 | |
| ARGENTINA | Signature | 30/11/1920 | |
| AUSTRALIA | Extension | 06/03/1922 | |
| AUSTRIA | Ratification | 01/12/1921 | |
| Bahamas | Extension | 01/12/1921 | |
| Barbados | Extension | 01/12/1921 | |
| Belgian Congo | Extension | 01/12/1921 | |
| BELGIUM | Ratification | 01/12/1921 | |
| Bermuda | Extension | 01/12/1921 | |
| BOLIVIA | Signature | 30/11/1920 | |
| BRAZIL | Ratification | 30/01/1924 | |
| BRITISH EMPIRE | Ratification | 01/12/1921 | |
| British Guiana | Extension | 01/12/1921 | |
| British Honduras | Extension | 01/12/1921 | |
| British Virgin Islands | Extension | 01/12/1921 | |
| Brunei | Extension | 01/12/1921 | |
| BULGARIA | Ratification | 27/02/1922 | |
| Canada | Extension | 01/12/1921 | |
| Cayman Islands | Extension | 01/12/1921 | |
| Ceylon | Extension | 01/12/1921 | |
| CHILE | Signature | 30/11/1920 | |
| CHINA | Ratification | 11/01/1922 | |
| COLOMBIA | Signature | 30/11/1920 | |
| COSTA RICA | Signature | 30/11/1920 | |
| CUBA | Signature | 30/11/1920 | |
| Cyprus | Extension | 01/12/1921 | |
| CZECHOSLOVAKIA | Ratification | 11/01/1922 | |
| DENMARK | Ratification | 27/07/1922 | |
| Dominica | Extension | 01/12/1921 | |
| DOMINICAN REPUBLIC | Ratification | 04/10/1923 | |
| East Indies | Extension | 01/01/1905 | |
| ECUADOR | Ratification | 11/02/1922 | |
| EGYPT | Ratification | 24/12/1921 | |
| ETHIOPIA | Ratification | 27/02/1922 | |
| Falkland Islands | Extension | 01/12/1921 | |
| Fiji | Extension | 01/12/1921 | |
| FINLAND | Ratification | 21/12/1921 | |
| FRANCE | Ratification | 01/12/1921 | |
| French Colonies | Extension | 01/12/1921 | |
| French Indo-china | Extension | 01/12/1921 | |
| GERMANY | Ratification | 01/12/1921 | |
| Gibraltar | Extension | 01/12/1921 | |
| Gilbert And Ellice Islands | Extension | 01/12/1921 | |
| Gold Coast | Extension | 01/12/1921 | |
| GREECE | Ratification | 15/07/1922 | |
| Grenada | Extension | 01/12/1921 | |
| GUATEMALA | Ratification | 09/06/1923 | |
| HAITI | Signature | 30/11/1920 | |
| HONDURAS | Signature | 30/11/1920 | |
| Hong Kong | Extension | 01/12/1921 | |
| HUNGARY | Ratification | 01/12/1921 | |
| ICELAND | Ratification | 27/07/1922 | |
| India | Extension | 01/12/1921 | |
| Italian Colonies | Ratification | 12/07/1922 | |
| ITALY | Ratification | 12/07/1922 | |
| Jamaica | Extension | 01/12/1921 | |
| JAPAN | Ratification | 01/12/1921 | |
| Kedah | Extension | 01/12/1921 | |
| Kelantan | Extension | 01/12/1921 | |
| Kenya | Extension | 01/12/1921 | |
| KOREA | Signature | 30/11/1920 | |
| LIBERIA | Signature | 30/11/1920 | |
| LUXEMBOURG | Ratification | 11/10/1922 | |
| Malay States, Federated | Extension | 01/12/1921 | |
| Malta | Extension | 01/12/1921 | |
| Mauritius | Extension | 01/12/1921 | |
| MEXICO | Ratification | 11/05/1922 | |
| Montserrat | Extension | 01/12/1921 | |
| Morocco | Extension | 01/01/1905 | |
| MOROCCO | Ratification | 01/04/1922 | |
| NETHERLANDS THE | Ratification | 01/12/1921 | |
| Nevis | Extension | 01/12/1921 | |
| New Hebrides | Extension | 01/12/1921 | |
| New Zealand | Extension | 06/03/1922 | |
| NICARAGUA | Signature | 30/11/1920 | |
| North Borneo | Extension | 01/12/1921 | |
| NORWAY | Ratification | 01/12/1921 | |
| PANAMA | Ratification | 01/10/1922 | |
| PARAGUAY | Signature | 30/11/1920 | |
| Perlis | Extension | 01/02/1921 | |
| PERSIA | Signature | 30/11/1920 | |
| PERU | Signature | 30/11/1920 | |
| PHILIPPINES | Signature | 30/11/1920 | |
| POLAND | Ratification | 14/04/1923 | |
| PORTUGAL | Ratification | 01/12/1921 | |
| ROUMANIA | Ratification | 09/04/1923 | |
| RUSSIA | Signature | 30/11/1920 | |
| SAAR TERRITORY | Signature | 30/11/1920 | |
| SALVADOR | Signature | 30/11/1920 | |
| SAN MARINO | Ratification | 01/01/1922 | |
| Sarawak | Extension | 01/12/1921 | |
| SERB-CROAT-SLOVENE STATE | Ratification | 28/06/1924 | |
| Seychelles | Extension | 01/12/1921 | |
| SIAM | Ratification | 21/01/1922 | |
| Sierra Leone | Extension | 01/12/1921 | |
| Solomon Islands Protectorate | Extension | 01/12/1921 | |
| Somaliland | Extension | 01/12/1921 | |
| South Africa | Extension | 21/01/1922 | |
| SPAIN | Ratification | 01/12/1921 | |
| Spanish Colonies | Extension | 01/12/1921 | |
| St Helena | Extension | 01/12/1921 | |
| St Kitts | Extension | 01/12/1921 | |
| St Lucia | Extension | 01/12/1921 | |
| St Vincent | Extension | 01/12/1921 | |
| Straits Settlements | Extension | 01/12/1921 | |
| SWEDEN | Ratification | 01/12/1921 | |
| SWITZERLAND | Ratification | 11/01/1922 | |
| The Gambia | Extension | 01/12/1921 | |
| Trinidad And Tobago | Extension | 01/12/1921 | |
| TUNIS | Ratification | 01/04/1922 | |
| TURKEY | Signature | 30/11/1920 | |
| Turks And Caicos Islands | Extension | 01/12/1921 | |
| Uganda | Extension | 01/12/1921 | |
| UNITED KINGDOM | Ratification | 01/12/1921 | |
| UNITED STATES OF AMERICA | Signature | 30/11/1920 | |
| URUGUAY | Signature | 30/11/1920 | |
| VENEZUELA | Ratification | 26/08/1924 | |
| Zanzibar | Extension | 01/12/1921 |