| 18 October 1907 |
26 January 1910 |
International Declaration Prohibiting the Discharge of Projectiles and Explosives from Balloons |
| 4 February 1914 |
|
Exchange of Notes between His Majesty's Government and the Government of the French Republic respecting the Trade in Arms and Ammunition at Muscat |
| 8 September 1927 |
|
Notes exchanged between His Majesty's Government in Great Britain and the Spanish Government [Spain] respecting the Reciprocal Recognition of Proof Marks on Firearms |
| 27 July 1933 |
|
Exchange of Notes between His Majesty's Government in the United Kingdom and the Austrian Government respecting the Reciprocal Recognition of Proof Marks on Firearms |