| Country | Action | Action Date | Effective Date |
|---|
| Australia | Signature | 28/10/1920 | |
| Australia | Ratification | 14/04/1922 | |
| Canada | Signature | 28/10/1920 | |
| Canada | Ratification | 14/04/1922 | |
| FRANCE | Signature | 28/10/1920 | |
| FRANCE | Ratification | 24/04/1924 | |
| India | Signature | 28/10/1920 | |
| India | Ratification | 14/04/1922 | |
| ITALY | Signature | 28/10/1920 | |
| ITALY | Ratification | 23/05/1927 | |
| JAPAN | Signature | 28/10/1920 | |
| New Zealand | Signature | 28/10/1920 | |
| New Zealand | Ratification | 14/04/1922 | |
| ROUMANIA | Signature | 28/10/1920 | |
| ROUMANIA | Ratification | 19/05/1922 | |
| South Africa | Signature | 28/10/1920 | |
| South Africa | Ratification | 14/04/1922 | |
| UNITED KINGDOM | Signature | 28/10/1920 | |
| UNITED KINGDOM | Ratification | 14/04/1922 | |