| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| FRANCE | Signature | 09/11/1914 | |
| FRANCE | Ratification | 21/12/1914 | |
| GREECE | Accession | 17/07/1918 | |
| ITALY | Accession | 15/01/1917 | |
| RUSSIA | Accession | 05/03/1915 | |
| SIAM | Accession | 11/05/1918 | |
| UNITED KINGDOM | Signature | 09/11/1914 | |
| UNITED KINGDOM | Ratification | 14/11/1914 |