Its sandblasted 41.5mm titanium case measures 12.3mm in height, one millimeter less than the steel ProDiver references despite having double the water resistance. This includes the protruding 3mm thick double-domed sapphire crystal with inner anti-reflective coating.
The coin-edge sandblasted titanium bezel, with 120-click unidirectional turning, holds a ceramic insert with a 60-minute dive scale made with infused Super-LumiNova.
The minute hand and dive bezel lume glow blue to assist with timing descents. Orange lume differentiates the hour hand, the seconds hand and the hour markers.
The U1S-T-PD6-B also mechanically outperforms its fellow ProDivers. It runs on the same Sellita caliber SW200-1a automatic movement that powered the original ProDiver and many other Unimatic watches.
While the SW200-1a matches the 41-hour power reserve of the Seiko caliber NH35A used in the other two references, it has a higher frequency at 28,800 beats per hour and two additional jewels, resulting in more consistent accuracy.