| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| Australia | Accession | 01/06/1926 | |
| Brunei | Extension | 16/11/1927 | |
| Cameroons | Accession | 07/06/1926 | |
| Canada | Accession | 18/09/1928 | |
| India | Accession | 01/01/1926 | |
| Irish Free State | Accession | 01/01/1926 | |
| LATVIA | Signature | 16/07/1924 | |
| LATVIA | Ratification | 30/06/1925 | |
| Malay States, Federated | Accession | 16/11/1927 | |
| Malay States, Unfederated | Accession | 16/11/1927 | |
| Malay States, Unfederated | Accession | 25/07/1934 | |
| NAURU | Accession | 01/01/1926 | |
| Nauru | Accession | 01/01/1926 | |
| New Guinea | Accession | 01/01/1926 | |
| New Zealand | Accession | 01/01/1926 | |
| Newfoundland (UK) | Accession | 01/01/1926 | |
| Norfolk Island (UK) | Accession | 01/01/1926 | |
| North Borneo | Accession | 07/06/1926 | |
| Palestine | Accession | 01/01/1926 | |
| Papua | Accession | 01/01/1926 | |
| South Africa | Accession | 01/01/1926 | |
| South West Africa | Accession | 01/01/1926 | |
| Tanganyika | Accession | 07/06/1926 | |
| Togoland | Accession | 07/06/1926 | |
| UNITED KINGDOM | Signature | 16/07/1924 | |
| UNITED KINGDOM | Ratification | 07/05/1925 | |
| WESTERN SAMOA | |||
| Western Samoa (UK) | Accession | 01/01/1926 |