IWC IW371301 Doppelchronograph SS Pilot Chronograph (31979)

31979 IWC 371301 Doppelchronograph, IW371301, stainless steel on a strap with a stainless steel tang buckle, automatic split second chronograph movement, black dial with applied white Arabic Numerals and luminescent hands, day and date windows at 3 O'clock, Diameter: 42mm, Thickness: 16.5mm, Sapphire Crystal, Water Resistant to 150ft., Like new with service box and 12 month warranty

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More about IWC IW371301 Doppelchronograph SS Pilot Chronograph

This is a stainless steel IWC Doppelchronograph IW371301. It has an alligator leather strap with a stainless steel tang buckle, and a scratch resistant sapphire crystal. It has round chronograph push buttons, a screw down winding crown, and there is a push button at the 10 o'clock position that activates the split-second chronograph function. The solid screw down case back is engraved with "IWC - DER DOPPELCHRONOGRAPH," and a serial number. The 42mm diameter solid two-body case, downturned lugs, stepped bezel, and bracelet are polished/brushed. It has a dust cap, and the dial is gloss black with luminous Arabic numeral hour markers, and square and triangular hour indices around an outer minute and 1/5 seconds track with white luminous Arabic numerals spaced every five seconds to 60. It has luminescent steel baton hands and a luminous center sweep chronograph seconds hand. There is a double day and date aperture window at 3 o'clock, and there are three recessed black subsidiary dials with white Arabic numerals, markers, and indicator hands, including a constant running small seconds register 9 o'clock, a 12-hour chronograph totalizer at 6 o'clock, and there is a 30-minute totalizer at 12. It's water resistant to 50 meters/165 feet, and it has a 44-hour power reserve at full winding. The 16.5mm thick case, dial, and movement are all signed.

This IWC Pilot (Flieger) Double Chronograph IW371301 has a mechanical automatic winding IWC caliber 79230 movement that's rhodium plated with fausses cotes embellishment. It's constructed with 29 jewels, a shock absorber mechanism, and a straight-line lever escapement. It includes a monometallic balance that's adjusted to 5 positions. a soft iron inner core that's anti-magnetic, and a self-compensating flat balance spring. It includes an index regulator, and a hacking seconds device for precision time setting. The mechanism oscillates at a frequency of 21,600 vph (4 Hz).

The IWC Pilot (Flieger) Double Chronograph IW371301 was introduced in 1996, and it was produced until 2005. It takes inspiration from the cockpit instrumentation and altimeter-like display of the Junkers 52 of the 1930's.