| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 08/08/1923 | |
| BELGIUM | Ratification | 19/08/1923 | |
| Cameroons | Accession | 01/08/1923 | |
| Malay States, Federated | Accession | 23/08/1934 | |
| Malay States, Unfederated | Accession | 23/08/1934 | |
| NEW GUINEA | Accession | 01/08/1928 | |
| Palestine | Accession | 01/08/1928 | |
| RWANDA-URUNDI | Accession | 01/08/1928 | |
| Solomon Islands Protectorate | Accession | 13/05/1937 | |
| South West Africa | Accession | 01/08/1928 | |
| Tanganyika | Accession | 01/08/1923 | |
| Togoland | Accession | 01/08/1923 | |
| TRANSJORDAN | Accession | 01/04/1932 | |
| UNITED KINGDOM | Signature | 08/08/1923 | |
| UNITED KINGDOM | Ratification | 08/09/1923 | |
| WESTERN SAMOA | Accession | 01/01/1928 |