Editorial
The 15720 is Audemars Piguet's current Royal Oak Offshore Diver, a 42mm steel sports watch built for serious water use with 300m water resistance and a crown-operated inner rotating bezel. It replaced the 15710 in 2020 with a revised lug geometry, updated bracelet, and a sharper overall silhouette. Collectors regard it as the most purposeful Offshore in the lineup -- a tool watch with genuine diver credentials that doesn't pretend to be something else.
AP introduced the 15720 in 2020 as a direct replacement for the 15710ST, refreshing the lug shape and bracelet construction while keeping the core diver proposition intact. The watch runs the in-house Calibre 3120, a 40-jewel automatic with a 60-hour power reserve, first introduced in 2003 and well proven across the broader Royal Oak Offshore family. The 15720ST.OO.A010CA.01 is the steel-on-rubber reference with blue accents; AP has also released versions on bracelet and in different dial colors.
No significant movement changes have accompanied the 15720 generation -- the redesign was cosmetic and ergonomic rather than mechanical. Production is ongoing as of 2026.
Confirm the reference suffix carefully: the A010CA.01 denotes the blue rubber strap configuration, and dial color designations shift across the suffix codes. Inspect the crown and crown tube closely -- the inner bezel mechanism adds a failure point that pure dial-side divers avoid, and crown tube damage is expensive to repair on any Offshore. Check the caseback gasket condition and ask for any service records; examples used in water are more likely to have unseen corrosion inside the bracelet links and around the crown tube.
The 2020 lug redesign means 15710 parts are not interchangeable with 15720 cases, so verify that any replaced parts are generation-correct. Bracelet stretch is common on worn examples -- check for excessive play at the clasp and between center links before buying pre-owned.
