Spring Drive GMT Chronograph SBGC203G

The first ever Grand Seiko chronograph, this model is powered by a Grand Seiko’s unique Spring Drive calibre, which combines the motive force of a mainspring with the high precision of a quartz watch. The Spring Drive mechanism allows the watch to maintain precise timekeeping while also incorporating accurate chronograph capabilities, all with a maximum 72-hour (3-day) power reserve.

Grand Seiko's original glide motion is also featured in the chronograph's blue steel second hand. The chronograph utilizes a Ready/Start button with a half-press shutter, reducing mistakes and allowing for accurate starts. The button has been designed with comfort of use in mind and produces a satisfying click with just the right resistance.

Case Material : Stainless steel
Glass Material : Dual-curved sapphire
Glass Coating : Anti-reflective coating on inner surface
Case size : Diameter 43.5mm × Thickness 16.1mm
The perimeter of Band : 201mm
Clasp type : Three-fold clasp with push button release

Movement
Calibre no. : 9R86
Movement Type : Spring Drive
Power reserve : Approx. 72 hours(3 days)
Accuracy : ±1 second per day / ±15 seconds per month (average)

Functions
Water resistance : 10 bar
Magnetic resistance : Equipped
Weight : 187.0 g

Other details / Features :
24-hour hand (dual time display function)
50 jewels
Calendar-linked time difference adjustment function
Case back with lion emblem
Chronograph with 30 minutes & 12 hours
Power reserve display
Screw case back
Screw-down crown
See-through case back
Stop seconds hand function