This is an Audemars Piguet Millenary Chronograph . It has an alligator leather strap with an Audemars Piguet double deployment clasp, and a scratch resistant sapphire crystal. It has a pull out winding crown set with a cabochon sapphire, round chronograph push buttons, and a solid case back secured with 6 screws and engraved with "MILLENARY," and a serial number. The 37mm by 41mm diameter elliptical solid three-body case, straight downturned lugs, and angled bezel are polished/brushed. The dial is two-tone silver with painted black Roman numeral hour markers, black alpha hands, a gold center sweep chronograph hand, and an inner railway-style minute/seconds track. It includes a perimeter tachometer scale to 600 UPH, and there is a date aperture window at the 3 o'clock position with a Cyclops magnification lens in the crystal. There are three gold-rimmed recessed elliptical subsidiary dials, including a running small seconds register at 12 o'clock, a 30-minute totalizer at 9 o'clock, and there is a 12-hour indicator at 6 o'clock, all with black hands. It has a 40-hour power reserve at full wind, and it's water resistant to 20 meters/65 feet. The 10mm thick case, dial, and movement are all signed.