OC860.)WWII BRITISH ARMY STOP WATCH: runs flawlessly. I've had it here on the desk just ticking away for nearly two days now. No issues. In a superb state of preservation, 2" wide face with glass. White porcelain with luminescent numbers and hands. Seconds hand just ticks along. Marked on the face with 'Helvetia' (Swiss) and reverse screws off revealing inner workings. Marked inside to Swiss maker 'General Watch, Switzerland'. Serial numbered on the inside of the nickel case '6010'. Back of case is marked with British army property stamp being typical 'broad arrow' proof along with 'GS/TF' (General Service Time Piece). Note the comments below from the internet....the P506 designation on this stop watch indicates that it was issued to the RAF and of course the '41' is the date. EXC++++

P506 / P.506: In the British military and government stores classification, this is an Air Ministry (AM) vocabulary code that designates a specific type of timing device or navigational stopwatch. [1]

41: This denotes the year the item was officially cataloged, contracted, or issued, which corresponds to 1941 (during the height of World War II).