| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BRITISH EMPIRE | Signature | 23/11/1923 | |
| BRITISH EMPIRE | Ratification | 06/08/1924 | |
| FRANCE | Signature | 23/11/1923 | |
| FRANCE | Ratification | 30/08/1924 | |
| ITALY | Signature | 23/11/1923 | |
| ITALY | Ratification | 06/08/1924 | |
| JAPAN | Signature | 23/11/1923 | |
| JAPAN | Ratification | 06/08/1924 | |
| ROUMANIA | Accession | 10/09/1928 | |
| UNITED KINGDOM | Signature | 23/11/1923 | |
| UNITED KINGDOM | Ratification | 06/08/1924 |