| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| Australia | Extension | 11/07/1927 | |
| Brunei | Extension | 03/11/1927 | |
| Cameroons | Extension | 15/07/1927 | |
| Canada | Extension | 15/08/1928 | |
| CZECHOSLOVAKIA | Signature | 11/11/1924 | |
| India | Extension | 11/07/1927 | |
| Irish Free State | Extension | 11/07/1927 | |
| Malay States, Federated | Extension | 03/11/1927 | |
| Malay States, Unfederated | Extension | 03/11/1927 | |
| Malay States, Unfederated | Extension | 29/08/1934 | |
| Nauru | Extension | 15/07/1927 | |
| New Guinea | Extension | 15/07/1927 | |
| New Zealand | Extension | 11/07/1927 | |
| Newfoundland (UK) | Extension | 11/07/1927 | |
| Norfolk Island (UK) | Extension | 11/07/1927 | |
| North Borneo | Extension | 01/03/1927 | |
| Palestine | Extension | 15/07/1927 | |
| Papua | Extension | 11/07/1927 | |
| South Africa | Extension | 11/07/1927 | |
| South West Africa | Extension | 15/07/1927 | |
| Tanganyika | Extension | 15/07/1927 | |
| Togoland | Extension | 15/07/1927 | |
| UNITED KINGDOM | Signature | 11/11/1924 | |
| UNITED KINGDOM | Ratification | 07/07/1926 | |
| Western Samoa (UK) | Extension | 15/07/1927 |