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Grand Seiko

Grand Seiko SBGA231 Sport Automatic Spring Drive 44.2mm Watch

$7,100.00 USD

Case Shape Round
Case Dimensions 44.2mm
Case Thickness 14mm
Case Material Titanium
Dial Color Black
Crystal Scratch Resistant Sapphire
Bezel Uni-Directional Rotating
Screw-in Crown Yes
Water Resistance 200m/660ft
Case Back Solid
Band Material Titanium
Color/Finish Brushed & Polished
Clasp Push Button Deployant Buckle
Movement Automatic
  • Brushed & polished titanium case.
  • Uni-directional rotating bezel with black bezel ring.
  • Black dial.
  • Applied polished hour markers with luminous fill.
  • Brushed hands, bold hour & minute hands with luminous fill.
  • Date window displayed at 3 o'clock.
  • Power Reserve Indicator located between 7 & 8 o'clock.
  • Grand Seiko Spring Drive caliber 9r65:
    • The Spring Drive movement is for the most part mechanical, but with a electrical powered regulating mechanism resulting in an extremely accurate timepiece.
    • No external source of power (such as a battery) is required. The unwinding force of the mechanically wound mainspring generates a slight electrical current.
    • The electrical power is then used to activate & power a quartz oscillator which vibrates at 32,786 Hz & transmits a precise reference signal to the Integrated Circuit.
    • The IC compares the speed from the oscillator to the speed of the glide wheel (which drives the gears) and applies a magnetic brake when it detects the glide-wheel turning too fast. ◦The seconds hand moves in a continuous smooth gliding motion.
    • Accurate up to +/- 1 second per day.
    • Contains 30 jewels & has an approximate power reserve of 72 hours or 3 days.

This watch is also known as: sbga231g