Caliber 6R54 is Seiko’s first mechanical GMT movement that is rugged enough to withstand rigorous diving conditions and as such, is showcased within the high-intensity Prospex Luxe collection. Providing a power reserve of approximately 72 hours (3 full days), the longest of any Seiko mechanical watch, the movement is equipped with a GMT hand can be set independently in one-hour increments, without interrupting the time-of-day hands, to provide a second time zone reading at a glance.