Monthly Archives: March 2023

History Review: AP Royal Oak 15500 Models

The Royal Oak Ref. 15400ST was launched in 2012 and remained in production until 2022. The most obvious difference between this model and its predecessor is the increase in case size, with the Ref. 15400ST measuring 41 mm in diameter instead of 39 mm. The thickness of the case has also increased slightly, from 9.4 […]