International Watch Co., Schaffhausen, "Spitfire Double Chronograph", Case No. 3454269, Ref. 371806, Cal. 79230, 44 mm, circa 2009

An aviator's rare, heavy, automatic watch with date and split seconds chronograph in near mint condition - with original box, guarantee card, operating instructions and accessories
Case: steel, anti-magnetic protection cap. Dial: two-tone silvered. Movm.: rotorwind movement, Glucydur balance.

Housed in a 44-millimetre stainless-steel case, the 79230-calibre chronograph movement vouches for the watch’s mechanical perfection. With its soft-iron inner case for protection against magnetic fields and a sapphire glass secured against sudden falls in pressure, the Double Chronograph has all the features needed by a watch designed for flying.
Source: http://www.iwc.com, as of 03/31/2016.