Grand Seiko SBGR307

A 3-day power reserve with lasting quality

The watch has a maximum 3-day power reserve and combines the latest in hairspring technology with an escapement developed through the MEMS technology to achieve high accuracy and stability when worn.

The exterior exudes a strong sense of presence and a tireless luxury befitting the Grand Seiko standard.

The delicacy, strength and beauty of the movement can be enjoyed the exhibition case back.

Specifications

Exterior

Exterior:               Stainless steel

Case back:           See-through & Screw case back

Glass Material:   Dual-curved sapphire crystal

Glass Coating:     Anti-reflective coating on inner surface

Case size:            Diameter 42.0mm Lug-to-lug 47.9mm Thickness 13.1mm

Band width:        21mm

Clasp type:          Three-fold clasp with push button release

The perimeter of Band:  205mm

Movement

Caliber no.:         9S68

Movement Type:              Automatic with manual winding

Power reserve:   Approx. 72 hours(3 days)

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.

Normal usage accuracy: +10 to -1 seconds per day

Functions

Water resistance:             10 bar

Magnetic resistance:       4,800 A/m

Weight: 173 g

Other details / Features:              

Screw-down crown

35 jewels