| Country | Action | Action Date | Effective Date |
|---|
| BRAZIL | Signature | 02/06/1911 | |
| BRAZIL | Accession | 20/10/1914 | |
| Ceylon | Extension | 21/07/1913 | |
| CUBA | Signature | 02/06/1911 | |
| CUBA | Accession | 03/12/1921 | 03/01/1922 |
| CZECHOSLOVAKIA | Accession | 30/09/1921 | |
| DANZIG | Accession | 20/03/1923 | |
| FRANCE | Signature | 02/06/1911 | |
| FRANCE | Ratification | 01/04/1913 | |
| GERMANY | Accession | 12/06/1925 | 12/06/1925 |
| Irish Free State | Accession | 27/10/1927 | |
| LATVIA | Withdrawal | | 21/12/1926 |
| LATVIA | Accession | 20/08/1925 | |
| LEBANON | Accession | 01/09/1924 | 01/09/1924 |
| MOROCCO | Accession | 30/06/1917 | |
| New Zealand | Extension | 25/04/1913 | |
| PORTUGAL | Signature | 02/06/1911 | |
| PORTUGAL | Ratification | 01/04/1913 | |
| SPAIN | Signature | 02/06/1911 | |
| SPAIN | Ratification | 01/04/1913 | |
| SWITZERLAND | Signature | 02/06/1911 | |
| SWITZERLAND | Ratification | 01/04/1913 | |
| SYRIA | Accession | 01/09/1924 | 01/09/1924 |
| Trinidad And Tobago | Extension | 21/07/1913 | |
| TUNIS | Signature | 02/06/1911 | |
| TUNIS | Ratification | 01/04/1913 | |
| UNITED KINGDOM | Signature | 02/06/1911 | |
| UNITED KINGDOM | Ratification | 01/04/1913 | |