Grand Seiko Sport Collection SBGH291G

A hi-beat 200m divers watch with the highest specifications
With its screw-down crown, distinctive hands generously coated with Lumibrite, one-way rotating bezel and water resistant to a depth of 200 meters, this watch provides all the security and legibility that the diver requires. It also offers the precision and durability of Grand Seiko's divers' high-beat movement, Caliber 9S85.
Each hand is different, to ensure that the time can be read easily and without error and the triangular marker at twelve oclock ensures that, even at depth, no mistake is made.
Every component is built to last, but all divers know that their watch needs regular maintenance, just like every other device on which his or her life may depend. This is why the case, stem pipe and crown are designed for secure servicing and even the bezel has a four-part design that makes for easy disassembly and re-assembly at the Grand Seiko Service Centers.

Exterior
Exterior: High-intensity titanium
Case back: Screw case back
Glass Material: Sapphire crystal
Glass Coating: Anti-reflective coating on inner surface
LumiBrite: LumiBrite on hands, index(es) and bezel
Case size: Diameter 43.8mm Lug-to-lug 51.0mm Thickness 14.7mm
Band width: 22mm
Clasp type: Three-fold clasp with secure lock & push button release, solid & slide adjuster
The perimeter of Band: 190mm

Movement
Caliber no.: 9S85 Instructions
Movement Type: Automatic with manual winding
Power reserve: Approx. 55 hours
Mean daily rate: +5 to -3 seconds per day
Mean daily rate is a mean value of daily rates in a condition where the movement before assembly in a case is measured in six positions in a fixed manner under artificially controlled environment for 12 days.


Functions
Magnetic resistance: 4,800 A/m
Weight: 142 g
Other details / Features:
Unidirectional rotating bezel
Screw-down crown
Three-fold clasp with secure lock
37 jewels

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