| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| AUSTRIA-HUNGARY | Signature | 18/04/1880 | |
| FRANCE | Signature | 18/04/1880 | |
| GERMANY | Signature | 18/04/1880 | |
| ITALY | Signature | 18/04/1880 | |
| RUSSIA | Signature | 18/04/1880 | |
| TURKEY | Signature | 18/04/1880 | |
| UNITED KINGDOM | Signature | 18/04/1880 |