IWC IW391008 Portofino Chronograph SS Black Dial (33376)

33376 IWC 3910 Portofino Chronograph, 3910-08, IW391008, 391008, stainless steel on a strap with a stainless steel tang buckle, Automatic, Date-day window at 3 o'clock, sweep second hand, black dial with applied silver index hour markers, sapphire crystal, water resistant, diameter: 42 mm, thickness: 13.5 mm, Like New with Box and Papers dated June 2018.


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More about IWC IW391008 Portofino Chronograph SS Black Dial

This is a stainless steel IWC Portofino Chronograph IW391008. The three body, polished and brushed case has angled lugs and a rounded bezel. Seven screws secure the case back, and it has a screw-down crown with a sapphire crystal that has anti-reflective coatings on both sides. The black alligator strap has a matching stainless steel tang buckle. The dial is black with applied silver baton index hour markers, an outer track with minutes/seconds, and steel feuille hands. There are subsidiary guilloche dials at 12 and 6 o'clock with 30-minute and 12-hour registers, and a day and date apertures at 3 o'clock. It's water resistant to 30 meters and it has a 44-hour power reserve. The chronograph has a stopwatch function with hours, minutes, and seconds, with round push buttons. The 13.5mm thick case, dial, and movement are all signed.

This IWC Portofino Chronograph IW391008 has a mechanical self-winding IWC calibeer 75320 movement that's rhodium plated with fausses cotes embellishment. It's constructed with 25 jewels and a shock absorber mechanism. It includes a straight-line lever escapement, a self-compensating flat balance spring, and a hacking mechanism. The monometallic balance is adjusted for heat, cold, and 5 positions. This sporty Portofino has round, "pushrod" shaped chronograph buttons that are reminiscent of the cockpit of a 1960's Italian sports car. The mechanism oscillates at a frequency of 28,800 vph (4 Hz).

The IWC Portofino Chronograph IW391008 was introduced in the 2000's.