IWC IW500109 Portuguese 7 Day Automatic SS Black Dial (31770)

31770 IWC 5001 Portuguese 7 Day Automatic, 500109, IW500109, 5001-09, stainless steel on a strap with a stainless deployant buckle, automatic movement, date, small seconds, 7 days power reserve, diameter: 42mm, thickness: 14mm, black dial with applied silver arabic numerals and steel blued hands, sapphire crystal, display back, water resistant, Like New with IWC service box pouch and original IWC warranty card dated November of 2010.


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More about IWC IW500109 Portuguese 7 Day Automatic SS Black Dial

This is a stainless steel IWC Portuguese 7 Day IW500109. The leather strap has a stainless deployment buckle, a sapphire crystal with antireflective coating on both sides, and a screw-down sapphire crystal display case back. The 42mm diameter solid three-body case and downturned lugs are polished/brushed. It has a screw-down crown, and a calendar aperture at 6 o'clock. The dial is black with applied silver Arabic numeral hour markers, an outer minute track with dot divisions, and steel feuille hands. A small hacking seconds sub dial with a stop function is at 9 o'clock, and the 7-day power reserve dial is at 3. It's water resistant to 30 meters/100 feet, and the 14mm thick case, dial, and movement are all signed.

This IWC Portuguese 7 Day IW500109 mechanical automatic self-winding IWC calibre 5000 Pellaton movement is rhodium plated with fausses cotes embellishment. It's constructed with 44 jewels, a straight-line lever escapement, and a shock absorber mechanism. It has a Glucydur beryllium alloy balance with high-precision adjustment cam on balance arms, and a self-compensating Breguet balance spring. There is a skeletonized bi-directional rotor with an 18K gold medallion inlay engraved "IWC -Probus Scafusia," (Fine Schaffhausen). The mechanism oscillates at a frequency of 18,000 vph (2.5 Hz).

The IWC Portuguese 7 Day IW500109 debuted in 2004. It references the first IWC Portuguese watches of the 1930's, with the railway track chapter ring, Arabic numerals, and feuille hands.