The Audemars Piguet Royal Oak Offshore Diver reference 15720ST.OO.A027CA.01 is a high-performance luxury sports watch featuring a 42mm stainless steel case with a thickness of 14.2mm. The design maintains the collection’s iconic octagonal bezel secured by eight hexagonal screws, paired with a navy blue Mega Tapisserie dial. It is equipped with two screw-locked ceramic crowns: one at the 3 o’clock position for adjusting the movement and another at 10 o’clock to operate the internal unidirectional rotating diving scale. The watch is powered by the in-house self-winding Calibre 4308, which provides a 60-hour power reserve and features a frequency of 4Hz.
This model is engineered for professional diving utility, offering a water resistance of 300 meters. Its complications include a date display at 3 o’clock, which is magnified by a lens integrated directly into the dial, and a center seconds hand. The dial is further enhanced with white gold applied hour markers and Royal Oak hands, both coated with luminescent material for high legibility in low-light conditions. A key technical feature is the innovative interchangeable strap system, which allows users to easily swap the navy blue rubber strap for the included additional black rubber strap.
General reviews of the 15720ST highlight the significant technical upgrades introduced in 2021, particularly the transition to the more modern and reliable Calibre 4308 movement. Enthusiasts often praise the quick-release strap system for its ease of use and the improved durability of the ceramic crowns compared to previous rubber-clad versions. While the 42mm size is noted for its substantial wrist presence and weight, it is frequently cited as a surprisingly comfortable and versatile daily wearer. Some reviewers observe that it remains a bold and polarizing choice within the Royal Oak family, though it is widely respected for its robust construction and high standard of mechanical finishing.