IWC,IWC Portuguese series, model: IW371615, automatic winding, stainless steel, diameter: 41mm, green dial, rare green dial: The gradient dark green dial has rich light layers and is highly recognizable compared to black and white dials. It is a popular and rare color combination Classic Portuguese chronograph layout: ultra-thin large dial, track minute markers, a benchmark for retro business formal wear style. New upgrade: The old model had a solid case back, but this one has a transparent back allowing you to observe the polishing of the chronograph movement. The power supply has been increased from 44 hours to 60 hours • Self-produced automatic timing core, bidirectional automatic winding, high winding efficiency The column wheel timing structure ensures smooth and stable operation with a low daily failure rate • Fish-scale pattern on the plywood, blue steel screws, polished chamfering, and German grinding process standards Lightweight wear: With a thickness of only 12.4mm, it can be easily stored in the cuffs of a suit