| Country | Action | Action Date | Effective Date |
|---|
| Antilles | Extension | 01/01/1986 | |
| ARGENTINE REPUBLIC | Signature | 18/10/1907 | |
| Aruba | Extension | 01/01/1986 | |
| AUSTRIA-HUNGARY | Signature | 18/10/1907 | |
| BELGIUM | Signature | 18/10/1907 | |
| BELGIUM | Ratification | 08/08/1910 | |
| BOLIVIA | Signature | 18/10/1907 | |
| BOLIVIA | Ratification | 27/11/1909 | |
| BRAZIL | Signature | 18/10/1907 | |
| BRAZIL | Ratification | 05/01/1914 | |
| BULGARIA | Signature | 18/10/1907 | |
| CHINA | Signature | 18/10/1907 | |
| CHINA | Ratification | 27/11/1909 | |
| COLOMBIA | Signature | 18/10/1907 | |
| CUBA | Signature | 18/10/1907 | |
| DOMINICAN REPUBLIC | Signature | 18/10/1907 | |
| ECUADOR | Signature | 18/10/1907 | |
| ETHIOPIA | Accession | 02/08/1935 | |
| FIJI | Succession | 02/04/1973 | |
| FINLAND | Accession | 09/06/1922 | |
| GREECE | Signature | 18/10/1907 | |
| HAYTI | Signature | 18/10/1907 | |
| HAYTI | Ratification | 02/02/1910 | |
| LIBERIA | Accession | 04/02/1914 | |
| LITHUANIA | Def EIF | 11/11/2004 | 09/01/2004 |
| LUXEMBOURG | Signature | 18/10/1907 | |
| LUXEMBOURG | Ratification | 05/09/1912 | |
| MADAGASCAR | Accession | 13/09/2009 | 06/12/2009 |
| NETHERLANDS THE | Signature | 18/10/1907 | |
| NETHERLANDS THE | Ratification | 27/11/1909 | |
| NETHERLANDS THE | Declaration | 18/10/2010 | |
| NICARAGUA | Accession | 16/12/1909 | |
| NORWAY | Signature | 18/10/1907 | |
| NORWAY | Ratification | 19/09/1910 | |
| PANAMA | Signature | 18/10/1907 | |
| PANAMA | Ratification | 11/09/1911 | |
| PERSIA | Signature | 18/10/1907 | |
| PERU | Signature | 18/10/1907 | |
| PORTUGAL | Signature | 18/10/1907 | |
| PORTUGAL | Ratification | 13/04/1911 | |
| SALVADOR | Signature | 18/10/1907 | |
| SALVADOR | Ratification | 27/11/1909 | |
| SIAM | Signature | 18/10/1907 | |
| SIAM | Ratification | 12/03/1910 | |
| SWITZERLAND | Signature | 18/10/1907 | |
| SWITZERLAND | Ratification | 12/05/1910 | |
| TOGO | Def EIF | 18/10/2004 | 17/12/2004 |
| TURKEY | Signature | 18/10/1907 | |
| UNITED KINGDOM | Signature | 18/10/1907 | |
| UNITED KINGDOM | Ratification | 27/11/1909 | |
| UNITED STATES OF AMERICA | Signature | 18/10/1907 | |
| UNITED STATES OF AMERICA | Ratification | 27/11/1909 | |
| URUGUAY | Signature | 18/10/1907 | |