Audemars Piguet Royal Oak Offshore 26400IO Titanium and Ceramic 'Anthracite' with Ceramic Pushpiece, Grey Anthracite “Méga Tapisserie” Dial with Silver Sub-Dials, Luminescent White Gold Applied Hour-Markers and Hands, Black Rubber Strap with Titanium Pin Buckle, AP Automatic Calibre 3126/3840 Manufacture Chronograph Automatic Movement, Sapphire Crystal Skeleton Exhibition Back, Fitted on a Vulcanized Rubber Strap;

The 44mm diameter solid three-body case, downturned hooded lugs, and flat octagonal ceramic bezel with 8 hexagonal white gold "through" screws are polished/brushed. The slate grey dial has a “Méga Tapisserie” waffle pattern with applied fat baton hour markers around a perimeter white minute/one-fourth second scale and a perimeter white tachymeter scale to 500 UPH on a gray rehaut. It has steel baton hour and minute hands with luminous fill and a steel center sweep chronograph second hand with a lozenge-shaped counterbalance. It includes a round silver-ringed date aperture window at 3 o'clock underneath a circular Cyclops magnifier lens. There are three recessed silver subsidiary dials with white markers, Arabic numerals, and silver/white indicator hands, including a small running constant seconds register at 12 o'clock, a 30-minute chronograph totalizer at 9 o'clock, and there is a 12-hour chronograph counter at 6 o'clock. It has a 50-hour power reserve at full wind, and it's water resistant to 100 meters/330 feet. It's fitted on a black vulcanized rubber strap with a titanium tongue buckle and scratch resistant sapphire glare-proofed crystals. It has a screw-locked hexagonal winding crown with protectors, topped rectangular chronograph push buttons, and there is an exhibition sapphire display case back secured with 8 screws.

This Audemars Piguet Royal Oak Offshore Chronograph Ref. 26400IO.OO.A004CA.01 has a mechanical automatic self-winding Audemars Piguet caliber 3126/3840 chronograph movement. It's rhodium-plated with Cotes de Geneve embellishment and It's constructed with 59 jewels, 365 components, bi-directional winding, inverted snailing on the bridges with diamond-graved bevels, a shock absorber device, and a straight-line lever escapement. It includes a monometallic balance that's adjusted to heat, cold, isochronism and 5 positions, a self-compensating flat balance spring with variable inertia blocks, a stop balance for precision time setting, and a monobloc 22-carat gold rotor oscillating weight with ceramic ball bearings. It has a balance-spring stud-holder with a screwed mobile stud, and the mechanism oscillates at a frequency of 21,600 vph (3Hz).