IWC 3902 Portuguese Yacht Club Chronograph 3902-04, IW390204, 390204, stainless steel on a black rubber strap with a stainless steel deployant buckle, automatic, black dial with applied silver numerals and hands, flyback chronograph: The sub-dial at the 12 o'clock position doubles as both the chronograph 60 minute counter (longer hand pointing to outer ring) & the 12 hour counter (short hand pointing to marking on inner ring), small seconds at 6 o'clock, IWC in-house movement, diameter: 45.4 mm, thickness: 14.5 mm, sapphire crystal, water resistant to 60 meters, Mint with box and papers