| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Accession | 06/12/1924 | |
| FRANCE | Signature | 18/12/1923 | |
| FRANCE | Ratification | 14/05/1924 | |
| NETHERLANDS THE | Accession | 01/08/1925 | |
| PORTUGAL | Accession | 23/02/1926 | |
| SPAIN | Signature | 18/12/1923 | |
| SPAIN | Reservation | 18/12/1923 | |
| SPAIN | Withdrawal | 07/02/1924 | |
| SPAIN | Ratification | 14/05/1924 | |
| SWEDEN | Accession | 19/09/1924 | |
| UNITED KINGDOM | Signature | 18/12/1923 | |
| UNITED KINGDOM | Ratification | 14/05/1924 |