| Contracting Party | Signature | Instrument | In Force | Details |
|---|
| Algeria | | Accession: March 24, 1972 | July 5, 1972 | Details |
| Bosnia and Herzegovina | | Accession: March 22, 2013 | June 22, 2013 | Details |
| Brazil | April 14, 1891 | Ratification: October 3, 1896 | October 3, 1896 | Details |
| Bulgaria | | Accession: April 29, 1975 | August 12, 1975 | Details |
| Cuba | | Accession: December 1, 1904 | January 1, 1905 | Details |
| Czech Republic | | Declaration of Continued Application: December 18, 1992 | January 1, 1993 | Details |
| Dominican Republic | | Accession: June 23, 1950 | April 6, 1951 | Details |
| Egypt | | Accession: March 5, 1951 | July 1, 1952 | Details |
| France | April 14, 1891 | Ratification: June 15, 1892 | July 15, 1892 | Details |
| Germany | | Accession: March 12, 1925 | June 12, 1925 | Details |
| Guatemala | April 14, 1891 | | | |
| Hungary | | Accession: April 13, 1934 | June 5, 1934 | Details |
| Iran (Islamic Republic of) | | Accession: March 18, 2004 | June 18, 2004 | Details |
| Ireland | | Accession: September 4, 1925 | December 4, 1925 | Details |
| Israel | | Accession: December 14, 1949 | March 24, 1950 | Details |
| Italy | | Accession: February 5, 1951 | March 5, 1951 | Details |
| Japan | | Accession: April 21, 1953 | July 8, 1953 | Details |
| Lebanon | | Accession: June 1, 1924 | September 1, 1924 | Details |
| Liechtenstein | | Accession: May 8, 1933 | July 14, 1933 | Details |
| Monaco | | Accession: February 9, 1956 | April 29, 1956 | Details |
| Montenegro | | Declaration of Continued Application: December 4, 2006 | June 3, 2006 | Details |
| Morocco | | Accession: April 30, 1917 | July 30, 1917 | Details |
| New Zealand | | | July 29, 1931 | Details |
| Poland | | Accession: October 30, 1928 | December 10, 1928 | Details |
| Portugal | April 14, 1891 | Ratification: October 31, 1893 | October 31, 1893 | Details |
| Republic of Moldova | | Accession: January 5, 2001 | April 5, 2001 | Details |
| San Marino | | Accession: June 25, 1960 | September 25, 1960 | Details |
| Serbia | | Declaration of Continued Application: September 19, 2006 | May 18, 2000 | Details |
| Slovakia | | Declaration of Continued Application: December 30, 1992 | January 1, 1993 | Details |
| Spain | April 14, 1891 | Ratification: June 15, 1892 | July 15, 1892 | Details |
| Sri Lanka | | Accession: October 9, 1952 | December 29, 1952 | Details |
| Sweden | | Accession: October 4, 1933 | January 1, 1934 | Details |
| Switzerland | April 14, 1891 | Ratification: June 15, 1892 | July 15, 1892 | Details |
| Syrian Arab Republic | | Accession: June 1, 1924 | September 1, 1924 | Details |
| Tunisia | April 14, 1891 | Ratification: June 15, 1892 | July 15, 1892 | Details |
| Turkey | | Accession: July 9, 1930 | August 21, 1930 | Details |
| United Kingdom | April 14, 1891 | Ratification: June 15, 1892 | July 15, 1892 | Details |
