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Product Summary

Mechanical 3Days equipped with calendar function in a powerful case size up

In a case with a presence of 42 mm, this model is equipped with a self-winding mechanical large diameter movement "Caliber 9 S 68" with a convenient calendar function. 
While it is a large case size, by narrowing down the tip, we design it as a clean silhouette from either the front or the side. 
Also, a powerful, three-dimensional index harmonizes with the presence of the case, creating a balanced and stately face. A simple silver dial that makes you feel the identity of Grand Seiko raises visibility by suppressing radiation. 




Case material:Stainless steel case back: Stainless steel and sapphire glass
Glass material:Dual Curved Sapphire Glass
Coating:Inner nonreflective coating
Case size:Vertical 47.9 mm × width 42.0 mm × thickness 13.1 mm
Arm circumference length (longest):205.0 mm


Movement:Caliber 9S68 Owner's Manual 
Drive system :Mechanical automatic winding (with manual winding)
Driving time:Maximum hoist lasts about 72 hours (about 3 days) lasts
accuracy :Static accuracy: Average day difference + 5 seconds to -3 seconds

Function · Specification

Crowd:One push three fold method
waterproof :Reinforced waterproof for everyday life (10 atm)
Magnetic resistance:There
weight :173.0 g
Other:· Back cover lion with coat of arms · Screw back · Screw back · Screw lock type crown · Number of stones 35 · second hand stop function 

In actual products, the orientation of the back cover may differ for manufacturing reasons.



Grand Seiko SBGR307 9S Mechanical

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