| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 23/03/1937 | |
| DENMARK | Signature | 23/03/1937 | |
| DENMARK | Ratification | 01/02/1938 | |
| GERMANY | Signature | 23/03/1937 | |
| ICELAND | Signature | 23/03/1937 | |
| ICELAND | Ratification | 15/03/1938 | |
| IRELAND, REPUBLIC OF | Signature | 23/03/1937 | |
| IRELAND, REPUBLIC OF | Ratification | 17/06/1940 | |
| NETHERLANDS THE | Signature | 23/03/1937 | |
| NORWAY | Signature | 23/03/1937 | |
| NORWAY | Ratification | 14/06/1938 | |
| POLAND | Signature | 23/03/1937 | |
| POLAND | Ratification | 10/12/1938 | |
| SWEDEN | Signature | 23/03/1937 | |
| SWEDEN | Ratification | 23/09/1937 | |
| UNITED KINGDOM | Signature | 23/03/1937 | |
| UNITED KINGDOM | Ratification | 30/06/1938 | |