IWC Portofino Chronograph Automatic Mens Watch IW391002 Imported Swiss-made caliber 79320 automatic movement 42mm stainless steel case stainless steel bezel black dial with silver-tone hands and stick markers Roman numerals at 6 and 12 o'clock scratch-resistant sapphire crystal three sub-dials displaying 30 seconds and 30 minutes and 12 hours functions include hours and minutes and seconds and chronograph day and date disply at 3 o'clock black alligator leather strap with deployment clasp power reserve of 44 hours water resistant to 3ATM (30m or 100 feet)