| Country | Action | Action Date | Effective Date |
|---|
| Alderney | Extension | 04/08/1923 | 01/05/1924 |
| ALGERIA | Accession | 01/07/1911 | |
| ARGENTINE REPUBLIC | Accession | 27/04/1927 | 15/07/1927 |
| AUSTRIA | Accession | 01/08/1921 | |
| AUSTRIA-HUNGARY | Signature | 11/10/1909 | |
| AUSTRIA-HUNGARY | Ratification | 01/03/1910 | |
| Barbados | Extension | 17/11/1911 | |
| Barbados | Denunciation | 22/07/1913 | |
| BELGIUM | Signature | 11/10/1909 | |
| BELGIUM | Ratification | 30/04/1910 | |
| BULGARIA | Signature | 11/10/1909 | |
| BULGARIA | Ratification | 01/03/1910 | |
| CZECHOSLOVAKIA | Accession | 28/02/1921 | |
| DANZIG | Accession | 12/09/1921 | 01/05/1922 |
| DENMARK | Accession | 13/08/1913 | |
| East Indies | Accession | 13/11/1915 | |
| EGYPT | Accession | 18/06/1927 | 15/07/1927 |
| FINLAND | Accession | 07/12/1920 | |
| FRANCE | Signature | 11/10/1909 | |
| FRANCE | Ratification | 01/03/1910 | |
| GERMANY | Signature | 11/10/1909 | |
| GERMANY | Ratification | 01/03/1910 | |
| Gibraltar | Extension | 17/11/1911 | |
| Gibraltar | Denunciation | 24/04/1926 | |
| GREECE | Signature | 11/10/1909 | |
| GREECE | Ratification | 22/07/1912 | |
| Guernsey | Extension | 20/12/1913 | 01/05/1914 |
| HUNGARY | Accession | 13/07/1923 | |
| HUNGARY | Declaration | 13/07/1923 | |
| India | Accession | 15/07/1911 | |
| Irish Free State | Accession | 18/04/1924 | |
| Isles Sous Le Vent | Accession | 13/07/1928 | 01/05/1929 |
| ITALY | Signature | 11/10/1909 | |
| ITALY | Ratification | 01/03/1910 | |
| Jersey | Extension | 20/12/1913 | 01/05/1914 |
| Leeward Islands | Extension | 17/11/1911 | |
| Leeward Islands | Denunciation | 22/07/1913 | |
| LIECHTENSTEIN | Accession | 14/04/1923 | 01/05/1924 |
| LITHUANIA | Accession | 28/12/1924 | 01/05/1925 |
| LUXEMBOURG | Accession | 25/07/1910 | |
| Malta | Extension | 17/11/1911 | |
| MONACO | Signature | 11/10/1909 | |
| MONACO | Ratification | 01/03/1910 | |
| MONTENEGRO | Signature | 11/10/1909 | |
| MONTENEGRO | Ratification | 20/05/1912 | |
| MOROCCO | Accession | 31/03/1922 | 01/05/1923 |
| NETHERLANDS THE | Signature | 11/10/1909 | |
| NETHERLANDS THE | Ratification | 19/08/1910 | |
| Nigeria, North | Extension | 17/11/1911 | |
| Nigeria, North | Withdrawal | 22/07/1913 | |
| Nigeria, South | Extension | 17/11/1911 | |
| Nigeria, South | Withdrawal | 22/07/1913 | |
| NORWAY | Accession | | 01/05/1922 |
| POLAND | Accession | 01/05/1921 | |
| PORTUGAL | Signature | 11/10/1909 | |
| PORTUGAL | Ratification | 05/02/1912 | |
| ROUMANIA | Signature | 11/10/1909 | |
| ROUMANIA | Ratification | 17/04/1911 | |
| RUSSIA | Signature | 11/10/1909 | |
| RUSSIA | Ratification | 05/03/1910 | |
| SAAR TERRITORY | Accession | 03/07/1924 | 01/05/1925 |
| SERBIA | Signature | 11/10/1909 | |
| Seychelles | Extension | 17/11/1911 | |
| Seychelles | Withdrawal | 22/07/1913 | |
| Sierra Leone | Extension | 17/11/1911 | |
| Sierra Leone | Withdrawal | 22/07/1913 | |
| SPAIN | Signature | 11/10/1909 | |
| SPAIN | Ratification | 01/03/1910 | |
| SWEDEN | Accession | 09/12/1910 | |
| SWITZERLAND | Accession | 01/05/1911 | |
| TUNIS | Accession | 01/05/1912 | |
| UNITED KINGDOM | Signature | 11/10/1909 | |
| UNITED KINGDOM | Ratification | 01/03/1910 | |
| UNITED KINGDOM | Extension | 17/11/1911 | |