GRAND SEIKO Spring Drive GMT

The rich fecundity of nature in Japan is central to the inspiration of many Grand Seiko designs. SBGE257, for example, has a dial whose color echoes the rich green of one of the 2,000 types of moss that can be found in Japan. There is something eternal about the moss that thrives at the base of trees or on garden stones, which is why it is so often used in Bonsai create the sense that time passes inexorably onwards. This sense is enhanced by the glide motion of the Spring Drive seconds hand as it moves continuously and silently across the dial.

Exterior

Exterior: Stainless steel with ceramic bezel

Case back: Screw case back

Glass Material: Dual-curved sapphire crystal

Glass Coating: Anti-reflective coating on inner surface

LumiBrite: Lumibrite on hands and index(es)

Case size: Diameter 40.5mm Lug-to-lug 48.7mm Thickness 14.7mm

Band width: 20mm

Clasp type: Folding clasp with push button release

Movement

Caliber no.: 9R66 Instructions

Movement Type: Spring Drive

Power reserve: Approx. 72 hours(3 days)

Accuracy: ±15 seconds per month (±1 second per day)

Functions

Water resistance: 20 bar

Magnetic resistance: 4,800 A/m

Weight: 172 g

Other details / Features:

Screw-down crown

30 jewels

24-hour hand (dual time display function)

Power reserve indicator

Calendar-linked time difference adjustment function

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