Grand Seiko Spring Drive Diver Titanium SBGA231

The Grand Seiko SBGA031 features a 44.2mm high-intensity titanium alloy case and bracelet exclusive to Seiko. This titanium is not only light weight, but also corrosion resistant and capable of achieving the mirror finishing technique known in Japan as Zaratsu, a method used for polishing katana blades. These attributes along with Seiko's Spring Drive technology in the exclusive Grand Seiko 9R65 caliber add up to the perfect recreational diver expressed in the SBGA031. The 9R65 found in the SBGA031 is rated to +/- 15 seconds per month, using an electro-magnetic braking system to control the unwinding of the mainspring, creating a completely smooth gliding motion that can only be found in Spring Drive. This also boasts a 72 hour power reserve with a display of power shown on the dial. This diver uses Lumi-Brite, another proprietary Seiko product, for unbelievable night time legibility, or when diving in the darkest waters. The SBGA031 also has a ratcheting expansion clasp, making it suitable to fit over a wet suit when needed.

Drive system Spring Drive
Caliber No. 9R65
Case High-intensity titanium
Bezel High-intensity titanium and black hard-coated high-intensity titanium
Case back Screw case back
Glass Sapphire crystal with anti-reflective coating
Bracelet Solid high-intensity titanium and solid titanium
Buckle Titanium and stainless steel with three-hold clasp with secure lock, push button release and diver adjuster
Accuracy ±1 second / day
Water resistance 200 m
Magnetic resistance 4800 A/m (60 gauss)
Weight 137g
Case thickness 14.0mm
Case diameter 44.2mm
Jewels 30
Remarks
One-way rotating bezel
Screw crown