| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| ALBANIA | Signature | 22/07/1926 | |
| AUSTRALIA | Extension | 08/03/1928 | |
| Canada | Extension | 20/10/1928 | |
| INDIA | Extension | 08/03/1928 | 08/03/1928 |
| Malay States, Federated | Extension | 20/10/1928 | |
| Malay States, Unfederated | Extension | 20/10/1928 | |
| NAURU | Extension | 16/03/1928 | |
| New Guinea | Extension | 16/03/1928 | |
| New Zealand | Extension | 08/03/1928 | |
| Newfoundland (UK) | Extension | 08/03/1928 | 08/03/1928 |
| North Borneo | Extension | 08/03/1928 | |
| Sarawak | Extension | 20/10/1928 | 20/10/1928 |
| SOUTH AFRICA | Extension | 08/03/1928 | 08/03/1928 |
| South West Africa | Accession | 16/03/1928 | |
| UNITED KINGDOM | Signature | 22/07/1926 | |
| UNITED KINGDOM | Ratification | 15/10/1926 | |
| WESTERN SAMOA | Extension | 16/03/1928 |