| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| All Territories under UK Sovereignty | Extension | 05/02/1873 | |
| British African Protectorates | Extension | 27/11/1911 | |
| ITALY | Signature | 05/02/1873 | |
| ITALY | Ratification | 18/03/1873 | |
| UNITED KINGDOM | Signature | 05/02/1873 | |
| UNITED KINGDOM | Ratification | 18/03/1873 |