| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 22/08/1919 | |
| FRANCE | Signature | 22/08/1919 | |
| GREECE | Signature | 22/08/1919 | |
| ITALY | Signature | 22/08/1919 | |
| NETHERLANDS THE | Signature | 22/08/1919 | |
| ROUMANIA | Signature | 22/08/1919 | |
| SWITZERLAND | Signature | 22/08/1919 | |
| UNITED KINGDOM | Signature | 22/08/1919 | |
| UNITED KINGDOM | Denunciation | 01/07/1935 | |
| UNITED KINGDOM | Withdrawal | 01/07/1935 | |
| YUGOSLAVIA | Signature | 22/08/1919 |