Grand Seiko Sport

The Grand Seiko Sport, reference SBGH255, has a 46.9 mm titanium case. The dial is covered by a sapphire crystal; this model has a date display. Self-winding calibre 9S85 has 37 jewels and approximately 55 hours of power reserve. Case thickness is 17 mm, with a lug-to-lug measurement of 50.8 mm; the bezel rotates unidirectionally; the case has a screw-down crown. The dial is made of pure iron, and the case has Zaratsu-polished mirror surfaces. LumiBrite is applied to the hands and indices; the watch has a titanium bracelet with an extension clasp with folding lock.