This is a Titanium Audemars Piguet Royal Oak Offshore Chronograph 25721TI.OO.1000TI.05. It has an integral Titanium link bracelet, and a scratch resistant sapphire crystal with anti-reflective coatings. The 42mm diameter solid three-body case, hooded integral lugs, octagonal fixed bezel with 8 screws, and bracelet are brushed/polished. It has a solid case back secured with 8 screws. The screwed down chronograph pushbuttons and winding crown have black rubber cladding, and there is a tachymeter sc ale to 500 UPH around the perimeter. The dial is silver with the tapestry "waffle" design texture, with large luminous Arabic numeral hour markers, luminous filled baton hands, and a central sweep chronograph hand. There are three silver recessed subsidiary dials, including a running small seconds dial at the 12 o'clock position, a 30-minute counter at 9 o'clock, and a 12-hour dial at 6. A date aperture window is at 3 o'clock underneath a 2.5x Cyclops magnifying lens. It's water resistant to 100 meters/330 feet, with a power reserve of 40-hours. The 14mm thick case, dial, and movement are all signed. The automatic self-winding Audemars Piguet caliber 2326/2840 movement is rhodium-plated with fausses cotes embellishment. It's constructed with 54 jewels, a shock absorber mechanism, and a straight-line lever escapement. It includes a monometallic balance that's adjusted to heat, cold, and 5 positions, a self-compensating flat balance spring, and a 21K gold rotor that oscillates at a frequency of 28,800 vph (4 Hz). Audemars Piguet produced the first Royal Oak in 1972, with a custom Jaeger LeCoultre movement designed by the brilliant horologist Gerald Genta.