Complete set, IWC, Portugal, model: IW500107 automatic mechanical stainless steel 42.3mm parameters • Specifications: Stainless steel case, 42.3mm in diameter, 14.2mm in thickness, formal large-diameter wristwatch; Original factory deep blue crocodile leather strap • Dial layout: Silver-white matte dial, blue steel leaf-shaped hands + blue Arabic numeral hour markers; ◦ 9 o 'clock small dial: Second hand dial ◦ 3-point power reserve dial (red scale indicates remaining power, 7-day long power source) ◦ Single calendar window at 6 o 'clock position • Waterproof: 30-meter daily water resistance The core highlights of the movement Equipped with IWC's self-produced Cal.50010 automatic winding movement, it features a 7-day (168-hour) ultra-long power reserve, dual mainspring barrels, 28 gemstone bearings, and a frequency of 28,800 vibrations per hour. The skeletonized rotor and transparent case back allow you to observe the polishing of the movement. It is a signature long power movement of Portuguese brands. Design traceability The Portuguese collection originated from a pocket watch custom-made by a Portuguese merchant in 1939, which was transformed into a wristwatch. The seven-day chain is the flagship model of the series. The classic first-generation color scheme features a white dial with blue hour markers and is also a benchmark for IWC dress watches.