| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| AUSTRIA | Signature | 05/12/1927 | |
| AUSTRIA | Communication | 10/09/1938 | |
| Cameroons | Extension | 23/01/1928 | |
| Nauru | Extension | 23/01/1928 | |
| New Guinea | Extension | 23/01/1928 | |
| Palestine, Mandated Territories (exc. Trans-Jordan) | Extension | 23/01/1928 | |
| South West Africa | Extension | 23/01/1928 | |
| Tanganyika | Extension | 23/01/1928 | |
| Togoland | Extension | 23/01/1928 | |
| UNITED KINGDOM | Signature | 05/12/1927 | |
| Western Samoa (UK) | Extension | 23/01/1928 |