Audemars Piguet Royal Oak Offshore Diver 15710ST 42mm 2017 [Preowned]Overview Audemars Piguet Royal Oak Offshore models are part of AP's more sportier and masculine version of the Royal Oak. Introduced in 1993 it was a hit amongst collectors, projecting a more modern version of a classic design. The Royal Oak Offshore Diver was originally introduced in 2010 (reference 15703ST). A newer model reference 15710ST was then introduced in 2015 which included a sapphire crystal caseback to showcase its well finished calibre.