| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| All Territories under UK Sovereignty | Extension | 06/12/1900 | |
| BOSNIA AND HERZEGOVINA | Succession | 01/10/1997 | |
| British African Protectorates | Extension | 01/11/1909 | |
| CROATIA | |||
| KOSOVO | Succession | 21/10/2009 | |
| MONTENEGRO | |||
| SERBIA | Signature | 23/11/1900 | |
| SERBIA AND MONTENEGRO | Succession | 11/04/1996 | |
| UNITED KINGDOM | Signature | 06/12/1900 | |
| UNITED KINGDOM | Ratification | 04/03/1901 | |
| YUGOSLAVIA | |||
| YUGOSLAVIA, FEDERAL REPUBLIC OF | Succession | 11/04/1996 |