IWC BIG PILOT’S WATCH (1940) The first IWC Big Pilot’s Watch (Ref. IW431, with Caliber 52 T.S.C.) was supplied to the Luftwaffe (German Air Force) in 1940 in an edition of 1,000 pieces. The “big device,” constructed according to the criteria for an observer’s watch, is the largest wristwatch ever made by IWC, with a…