"Steel King", starting from the "core" - Audemars Piguet Royal Oak "Jumbo" Ultra-Thin 16202ST Watch 39mm diameter, streamlined two-hand design continues the purest "Steel King" bloodline of the Royal Oak 5402. The sunburst tapisserie dial is paired with three-dimensional hour markers, which are filled with luminous light like the hour and minute hands. The calendar window at three o'clock is a typical daily wear function. The simple and classic design undoubtedly makes it the most popular fashion sports watch today. The transparent bottom cover can display the latest 50th anniversary movement of the Royal Oak, which is upgraded with calibre 7121 movement, which has a higher beat rate and power storage than the previous 2121 movement.