| Country | Action | Action Date | Effective Date |
|---|
| ARGENTINE REPUBLIC | Signature | 17/01/1912 | |
| Australia | Extension | 23/05/1921 | |
| AUSTRIA | Accession | 17/12/1921 | |
| AUSTRIA-HUNGARY | Signature | 17/01/1912 | |
| AUSTRIA-HUNGARY | Ratification | 01/08/1924 | |
| Belgian Congo | Extension | 18/10/1926 | |
| BELGIUM | Signature | 17/01/1912 | |
| BELGIUM | Ratification | 07/10/1920 | |
| BOLIVIA | Signature | 17/01/1912 | |
| BRAZIL | Signature | 17/01/1912 | |
| BRAZIL | Ratification | 06/02/1922 | |
| BULGARIA | Signature | 17/01/1912 | |
| BULGARIA | Ratification | 07/12/1922 | |
| CHILE | Signature | 17/01/1912 | |
| COLOMBIA | Signature | 17/01/1912 | |
| COLOMBIA | Ratification | 29/04/1921 | |
| COSTA RICA | Signature | 17/01/1912 | |
| CUBA | Signature | 17/01/1912 | |
| CZECHOSLOVAKIA | Accession | 08/04/1926 | |
| DANZIG | Accession | 29/05/1923 | |
| DENMARK | Signature | 17/01/1912 | |
| DENMARK | Ratification | 07/10/1920 | |
| ECUADOR | Signature | 17/01/1912 | |
| ECUADOR | Ratification | 07/10/1920 | |
| EGYPT | Signature | 17/01/1912 | |
| EGYPT | Ratification | 07/10/1920 | |
| FRANCE | Signature | 17/01/1912 | |
| FRANCE | Ratification | 07/10/1920 | |
| GERMANY | Signature | 17/01/1912 | |
| GERMANY | Ratification | 08/04/1921 | |
| GREECE | Signature | 17/01/1912 | |
| GUATEMALA | Signature | 17/01/1912 | |
| GUATEMALA | Ratification | 10/11/1921 | |
| HAYTI | Signature | 17/01/1912 | |
| HONDURAS | Signature | 17/01/1912 | |
| HONDURAS | Ratification | 20/12/1923 | |
| ITALY | Signature | 17/01/1912 | |
| ITALY | Ratification | 07/10/1920 | |
| LUXEMBOURG | Signature | 17/01/1912 | |
| LUXEMBOURG | Ratification | 28/06/1922 | |
| MEXICO | Signature | 17/01/1912 | |
| MEXICO | Ratification | 27/07/1923 | |
| MONACO | Accession | 29/11/1920 | |
| MONTENEGRO | Signature | 17/01/1912 | |
| NETHERLANDS THE | Signature | 17/01/1912 | |
| NETHERLANDS THE | Ratification | 07/10/1920 | |
| New Zealand | Extension | 02/05/1924 | |
| Newfoundland (UK) | Extension | 04/03/1921 | |
| NORWAY | Signature | 17/01/1912 | |
| NORWAY | Ratification | 07/10/1920 | |
| PANAMA | Signature | 17/01/1912 | |
| PANAMA | Ratification | 07/10/1920 | |
| PERSIA | Signature | 17/01/1920 | |
| PERSIA | Ratification | 07/10/1920 | |
| POLAND | Accession | 12/05/1923 | |
| PORTUGAL | Signature | 17/01/1912 | |
| PORTUGAL | Ratification | 07/10/1920 | |
| ROUMANIA | Signature | 17/01/1912 | |
| ROUMANIA | Ratification | 29/04/1921 | |
| Ruanda Urundi | Extension | 18/10/1926 | |
| RUSSIA | Signature | 17/01/1912 | |
| SALVADOR | Signature | 17/01/1912 | |
| SERB-CROAT-SLOVENE STATE | Signature | 17/01/1912 | |
| SERB-CROAT-SLOVENE STATE | Ratification | 20/12/1920 | |
| SIAM | Signature | 17/01/1912 | |
| SOVIET UNION | Accession | 06/11/1925 | |
| SPAIN | Signature | 17/01/1912 | |
| SPAIN | Ratification | 07/10/1920 | |
| SWEDEN | Signature | 17/01/1920 | |
| SWEDEN | Ratification | 07/10/1920 | |
| SWITZERLAND | Signature | 17/01/1912 | |
| SWITZERLAND | Ratification | 07/10/1920 | |
| TURKEY | Signature | 17/01/1912 | |
| UNITED KINGDOM | Signature | 17/01/1912 | |
| UNITED KINGDOM | Ratification | 07/10/1920 | |
| UNITED STATES OF AMERICA | Signature | 17/01/1912 | |
| UNITED STATES OF AMERICA | Ratification | 07/10/1920 | |
| URUGUAY | Signature | 17/01/1912 | |
| URUGUAY | Ratification | 18/07/1921 | |