| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| All Territories under UK Sovereignty | Extension | 23/06/1881 | |
| EL SALVADOR | Signature | 23/06/1881 | |
| UNITED KINGDOM | Signature | 23/06/1881 | |
| UNITED KINGDOM | Extension | 03/10/1910 | |
| UNITED KINGDOM | Extension | 08/08/1930 | |
| UNITED KINGDOM | Extension | 16/06/1934 | |
| UNITED KINGDOM | Extension | 08/04/1937 |