8mm case thickness. The dial is matte with a faint starburst pattern and large, round dots for hour markers. Its hardiness is enhanced by a sapphire crystal, screwed-down crown, and 200m water resistance that all work to keep it ticking, rain or shine. The off-set positioning of the crown at 4 o’clock also offers superior wrist comfort. Like the Neptune, the RA-AC0K showcases powerful, lasting lume on the hands, hour markers, and pip of the bezel. These features combined ensure the watch has all the toughness and legibility of its predecessors while sacrificing none of the wearability.