| Country | Action | Action Date | Effective Date |
|---|
| BRITISH EMPIRE | Signature | 11/02/1925 | |
| BRITISH EMPIRE | Ratification | 17/02/1926 | |
| BURMA | Accession | 01/04/1937 | |
| CAMBODIA | Accession | | 03/10/1951 |
| CHINA | Signature | 11/02/1925 | |
| FIJI | Succession | 01/11/1971 | |
| FRANCE | Signature | 11/02/1925 | |
| FRANCE | Ratification | 29/04/1926 | |
| INDIA | Signature | 11/02/1925 | |
| INDIA | Ratification | 17/02/1926 | |
| JAPAN | Signature | 11/02/1925 | |
| JAPAN | Ratification | 10/10/1928 | |
| LAOS | Accession | | 07/10/1950 |
| NETHERLANDS THE | Signature | 11/02/1925 | |
| NETHERLANDS THE | Ratification | 01/03/1927 | |
| PORTUGAL | Signature | 11/02/1925 | |
| PORTUGAL | Ratification | 13/09/1926 | |
| PORTUGAL | Reservation | 13/09/1926 | |
| SIAM | Signature | 11/02/1925 | |
| SIAM | Ratification | 06/05/1927 | |
| SIAM | Reservation | 06/05/1927 | |
| UNITED KINGDOM | Signature | 11/02/1925 | |
| UNITED KINGDOM | Ratification | 17/02/1926 | |
| VIETNAM | Accession | | 11/08/1950 |