| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| ARMENIA | Signature | 10/08/1920 | |
| AUSTRALIA | Signature | 10/08/1920 | |
| BELGIUM | Signature | 10/08/1920 | |
| CANADA | Signature | 10/08/1920 | |
| CZECHOSLOVAKIA | Signature | 10/08/1920 | |
| FRANCE | Signature | 10/08/1920 | |
| GREECE | Signature | 10/08/1920 | |
| INDIA | Signature | 10/08/1920 | |
| ITALY | Signature | 10/08/1920 | |
| JAPAN | Signature | 10/08/1920 | |
| NEW ZEALAND | Signature | 10/08/1920 | |
| POLAND | Signature | 10/08/1920 | |
| PORTUGAL | Signature | 10/08/1920 | |
| ROUMANIA | Signature | 10/08/1920 | |
| SOUTH AFRICA | Signature | 10/08/1920 | |
| TURKEY | Signature | 10/08/1920 | |
| UNITED KINGDOM | Signature | 10/08/1920 |