IW3251-12Ref

The IWC Pilot's Watch UTC 3251 debuted in 1998, providing a larger case than the Mark XV and a 24-hour rotating disc for tracking a second time zone. The caliber 37526 was used until 2003, when it was replaced by the 30710, while 'Spitfire' models were added in 2005. Reference IW3251-12, which includes a stainless steel case and silver dial, replaced the previous Spitfire UTC around 2006.