The IWC Pilot's Watch Top Gun Chronograph (reference IW3890-13) was designed specifically for members of the 663 Squadron, who used to be part of the RAF but are now part of the Army Air Corp. This squadron specializes in operating Apache attack helicopters. The watch features a personalized case back with the owner's name and call sign, and their emblem can also be found on the unique 'Miramar' style dial at the 9 o'clock position.