The IWC Pilot's Watch Doppelchronograph ref. 3713, produced from 1996 to 2005, was the second pilot's watch from IWC to have a split-second chronograph. It came in stainless steel, yellow gold, or platinum, with different dial options and day discs in various languages. You could get the stainless steel version on a strap or bracelet, while the platinum one had only five pieces on a bracelet. Starting in 2003, the 3713 was only available with Spitfire-inspired dials. If you're interested, check out the reference IW3713-41, which has a stainless steel case and a silver 'Spitfire' dial.