The lock is very clearly marked :-
This was developed at the end of the war
The rubber hose is in amazing condition but does show a small bit of dry rot
it was unpopular due to the problem of thick smoke and a powerful recoil
however the date has been worn away
Original U.S. WWII Framed D-Day Map of Normandy - Cherbourg and Valogres 1943 - 32¼ x 38” Snider Rifle Accessories The lock is very clearlyOriginal Item: Only One Available. British made Geographical Section, General Staff, No. 4249. Published by the War Office 1942, 2nd Edition 1943. Map is entitled 'Cherbourg Valogres', France, 1 to 100,000 scale, Sheet 6E, 1942, 2nd edition 1943. This map shows the area of Normandy including Utah and Omaha Beaches, Carentan and St. Mere Eglise. An Allied map of Normandy of the type used during the 1944 Battle of Normandy. This is an extremely rare