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Royal Oak Offshore Diver

The Royal Oak Offshore Diver is the tool-watch corner of Audemars Piguet's most aggressive family, a 42mm steel dive watch built on the octagonal Offshore case with an internal rotating bezel and 300m of water resistance. It arrived as regular production in 2010 with reference 15703ST, ran through the 15710ST from 2015, and reached its current form as the 15720ST in 2021. We buy and sell these every month at our counter at 19 W 47th Street, and it remains one of the most straightforward ways to get real AP on the wrist without paying a Royal Oak 'Jumbo' premium. It is a genuine diver: no chronograph, a second crown at 10 o'clock to drive the inner bezel, Méga Tapisserie dial, and enough case presence that a 42mm reads bigger than the number suggests. Collectors who came up on Submariners and Sea-Dwellers recognize the format immediately, then notice the finishing and the octagon and understand the price step. This entry covers what changed across the three references, what the movements actually are, where the pricing sits on both the buy side and the sell side, and how to make sure the one in front of you is right before money moves.

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Specifications

Case_diameter42mm across all references (15703ST, 15710ST, 15720ST)
Case_thickness15703ST approximately 13.8mm; 15720ST approximately 14.2mm
Case_materialStainless steel with the Offshore's screwed octagonal bezel and exposed screws
CrownsTwo crowns; main winding and setting crown at 3 o'clock, second crown at 10 o'clock operating the internal rotating dive bezel with a 15-minute scale zone
Water_resistance300 meters (30 ATM) across all three references
CrystalGlareproofed sapphire crystal front; 15720ST adds a sapphire display caseback (earlier 15703ST and 15710ST used a solid steel caseback)
DialMéga Tapisserie (large waffle) dial with applied and luminous-coated hour markers; 18k gold hands and markers on the 15720ST
Movement_15703_15710Caliber 3120, self-winding, 40 jewels, 280 parts, 21,600 vph (3 Hz), central 22k gold rotor, approximately 60-hour power reserve
Movement_15720Caliber 4308, self-winding, 32 jewels, approximately 60-hour power reserve, visible through sapphire caseback
StrapRubber strap; the 15720ST introduced AP's patented quick-release interchangeable strap and bezel-accent system
Years15703ST from 2010, 15710ST from 2015, 15720ST from 2021

History

Iconic References

Buying Guide

Pricing & Market Data

Cultural Significance

Collector's Lore

The Offshore Diver's lineage traces straight back to the era that made the Royal Oak Offshore a cultural object: the 1999 End of Days limited edition (ref. 25770) tied to Arnold Schwarzenegger and the movie of the same name, limited to 500 pieces and the first Offshore to use PVD over steel, and the 2003 Terminator 3 pieces built to coincide with the film. Those celebrity-and-cinema editions turned a watch into a pop-culture statement and set the stage for AP to build a serious dive tool on the same case. Collectors prize the original 15703ST for being the clean first execution with the beloved caliber 3120, and the 15710 run is loved for its rainbow of dials, where a rare color in a full set can outsell a common black. The 2021 switch to the display-caseback 15720ST split opinion: some purists miss the solid caseback and the 3120, others welcome finally seeing the movement and the quick-change strap system. Either way, among AP people the Diver has quietly become the connoisseur's everyday AP, the one you actually wear.

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