| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| Australia | Accession | 14/09/1925 | |
| Brunei | Accession | 28/04/1927 | |
| Cameroons | Accession | 25/11/1926 | |
| Canada | Extension | 19/09/1928 | |
| FINLAND | Signature | 30/05/1924 | |
| FINLAND | Ratification | 20/06/1924 | |
| India | Accession | 14/09/1925 | |
| Irish Free State | Accession | 14/09/1925 | |
| Kelantan | Extension | 19/10/1934 | |
| Malay States, Federated | Extension | 28/04/1927 | |
| Malay States, Unfederated | Extension | 28/04/1927 | |
| Nauru | Accession | 14/12/1925 | |
| New Guinea | Accession | 14/12/1925 | |
| New Zealand | Accession | 14/09/1925 | |
| Newfoundland (UK) | Accession | 14/09/1925 | |
| Norfolk Island (UK) | Accession | 14/09/1925 | |
| North Borneo | Accession | 25/11/1926 | |
| Palestine | Accession | 25/11/1926 | |
| Papua | Accession | 14/09/1925 | |
| Perlis | Extension | 19/10/1934 | |
| South Africa | Accession | 14/09/1925 | |
| Tanganyika | Accession | 25/11/1926 | |
| Togoland | Accession | 25/11/1926 | |
| Trenganu | Extension | 19/10/1934 | |
| UNITED KINGDOM | Signature | 30/05/1924 | |
| UNITED KINGDOM | Ratification | 01/09/1924 | |
| Western Samoa (UK) | Accession | 14/12/1925 |