IWC IW379503 Aquatimer Chronograph Expedition Charles Darwin Bronze (28428)

28428 IWC 3795 Aquatimer Chronograph Expedition Charles Darwin Bronze, IW379503, 3795-03, 379503, bronze case on a rubber strap with a bronze tang buckle, automatic IWC caliber 89365 movement, rubber-coated screw-down crown and chronograph pushers, chronograph, date, unidirectional internal rotating bezel, small seconds at 6 o'clock, minute totalizer at 12 o'clock, black dial with luminous hands and hour markers, 68-hour power reserve, sapphire crystal, water resistant to 300 meters, diameter: 44mm, thickness: 17mm, like new with box and papers dated November 2014.

$7,500

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More about IWC IW379503 Aquatimer Chronograph Expedition Charles Darwin Bronze

This is a bronze IWC Aquatimer Chronograph Expedition Charles Darwin Bronze IW379503. It has a black checked pattern rubber strap with the IWC-patented quick-change system, a bronze tang buckle, and a convex scratch resistant sapphire crystal with antireflective coating on both sides. It has oval rubber coated chronograph push buttons, an octagonal rubber clad screw down winding crown, and there is a bronze button that operates the sliding clutch system flanked by black twin correctors on the left side of the case edge at the 9 o'clock position; this advances the black rubber inner dive bezel. It has a screw-down solid case back with a portrait of Charles Darwin in relief, and it's engraved with "IWC AQUATIMER CHRONOGRAPH – EXPEDITION CHARLES DARWIN – 30 BAR," and a serial number. It has a vulcanized rubber mechanical unidirectional rotating bezel with IWC's SafeDive system, including luminous white baton indices and bronze Arabic numerals at 15, 30, and 45 minutes, and a bronze triangle at 60. The 44mm diameter solid three-body case, straight lugs, and rounded rubber bezel, are matte black. The dial is black with applied luminescent SuperLuminova "U-shaped" hour indices around a luminous white minute/seconds scale. It has luminous black steel pointed wide baton hands, and a black center sweep chronograph hand with a skeletonized luminous arrow tip. There is a luminous date aperture window at 3 o'clock, and there are twin recessed black subsidiary dials with luminous white markers, Arabic numerals, and bronze hands, including a running small seconds register at 12 o'clock, and a 60-minute chronograph totalizer at 6 o'clock. It has a 68-hour power reserve at full wind, and it's water resistant to 300 meters/1000 feet. The 17mm thick case, dial, and movement are all signed.

This IWC Aquatimer Chronograph Expedition Charles Darwin Bronze IW379503 has a mechanical automatic self-winding IWC caliber 89365 fly back chronograph movement. It's rhodium-plated, with fausses cotes and cotes de Geneve embellishment. It's constructed with 38 jewels, 474 components, and a shock absorber mechanism. It includes a straight-line lever escapement, a monometallic balance that's adjusted for heat, cold, and 5 positions, a self-compensating flat balance spring, and a small seconds hacking system for precision time setting. The mechanism oscillates at a frequency of 28,800 vph (4 Hz).

The IWC Aquatimer Chronograph Expedition Charles Darwin Bronze IW379503 was introduced in 2014. IWC contributed a percentage of the proceeds from the sale of each Aquatimer Chronograph Expedition to the Charles Darwin Foundation.