Grand Seiko Sport

The Grand Seiko Sport, reference SBGA391, is a Spring Drive dive watch with a 44.2 mm steel case and is a limited edition of 200 pieces. Approximately 72 hours of power reserve is provided by Spring Drive calibre 9R65, with 30 jewels. The 14 mm case thickness accompanies a lug-to-lug measurement of 51 mm; water resistance is rated to 200 metres. The dial is covered by a sapphire crystal with an inner anti-reflective coating. The steel bracelet has an extension clasp with folding lock. The watch has a date display and a power reserve indicator. The hands and indices carry LumiBrite, and the bezel rotates unidirectionally.