| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 09/09/1886 | |
| BELGIUM | Ratification | 05/09/1887 | |
| BHUTAN | Accession | 25/08/2004 | 25/11/2004 |
| CYPRUS | Succession | 10/09/1968 | |
| DENMARK | Accession | 01/07/1903 | |
| FRANCE | Signature | 09/09/1886 | |
| FRANCE | Ratification | 05/09/1887 | |
| GERMANY | Signature | 09/09/1886 | |
| GERMANY | Ratification | 05/09/1887 | |
| GERMANY FEDERAL REPUBLIC | Succession | 01/01/1905 | |
| GERMANY FEDERAL REPUBLIC | Objection | 23/07/2004 | 01/01/1900 |
| Gibraltar | Extension | 01/10/2020 | 01/01/2021 |
| HAYTI | Signature | 09/09/1886 | |
| HAYTI | Ratification | 05/09/1887 | |
| ITALY | Signature | 09/09/1886 | |
| ITALY | Ratification | 05/09/1887 | |
| JAPAN | Accession | 15/07/1899 | |
| Jersey, Bailiwick of | Extension | 31/10/2013 | 01/01/2014 |
| LAO PEOPLE'S DEMOCRATIC REPUBLIC | Accession | 14/12/2011 | 14/03/2012 |
| LIBERIA | Signature | 09/09/1886 | |
| LUXEMBOURG | Accession | 20/06/1888 | |
| MALTA | Succession | 29/05/1968 | 21/09/1964 |
| MONACO | Accession | 30/05/1889 | |
| MONTENEGRO | Accession | 01/07/1893 | |
| MONTENEGRO | Withdrawal | 01/04/1900 | |
| NORWAY | Accession | 13/04/1896 | |
| POLAND | Accession | 28/01/1920 | |
| SERBIA | Declaration | 19/09/2006 | |
| SPAIN | Signature | 09/09/1886 | |
| SPAIN | Ratification | 05/09/1887 | |
| SWEDEN | Accession | 01/08/1904 | |
| SWITZERLAND | Signature | 09/09/1886 | |
| SWITZERLAND | Ratification | 05/09/1887 | |
| SWITZERLAND | Accession | 02/12/1955 | |
| TUNIS | Signature | 09/09/1886 | |
| TUNIS | Ratification | 05/09/1887 | |
| UK Responsibility Territories | Extension | 05/09/1887 | |
| UNITED KINGDOM | Declaration | 09/09/1886 | |
| UNITED KINGDOM | Signature | 09/09/1886 | |
| UNITED KINGDOM | Ratification | 05/09/1887 |