The Audemars Piguet Royal Oak Offshore 26170ST is the discontinued steel chronograph generation that defined the Offshore lineage from the early 2000s through 2014, and this 2011 example features the highly recognizable Volcano configuration with black Mega Tapisserie dial framed by bright orange Arabic numerals, an orange-rimmed inner tachymeter ring, and matching orange-stitched black hornback strap. The 42mm stainless steel octagonal case carries the eight signature hexagonal-head bezel screws and the deeply finished alternating satin and polished surfaces that define the Royal Oak architectural language, with the bold pushpiece guards, screw-down crown, and slab side profile that earned the Offshore the affectionate nickname "The Beast" upon its 1993 debut. Powered by the AP-built Caliber 3126/3840 self-winding chronograph movement, beating at 21,600 vibrations per hour through 365 parts and 59 jewels, delivering a 50-hour power reserve. The chronograph layout places the 30-minute counter at 3, 12-hour counter at 9, and small seconds at 12, with the date window between 4 and 5. Sapphire crystal, 100 meters of water resistance. Affirm financing available at checkout. Pre-owned, 2011 production.