Grand Seiko Historical Collection Self-Dater Spring Drive Platinum Limited Edition SBGA107

In 1964, the 2nd generation of Grand Seiko was released. Manufactured at Suwa Seikosha (now Seiko Epson), the Grand Seiko Self-Dater was the 1st model of Grand Seiko not only to use a date display, but also water resistance and to use the Zaratsu polishing technique. For the 50th Anniversary of this model, Seiko has introduced 3 Spring Drive models, and 2 quartz models to commemorate this piece as a part of their Historical Collection. Also made at their Suwa facility, Shinshu Watch Studio, these limited editions feature higher accuracy calibers, the 9R15 for Spring Drive rating at +/- 10 seconds a month, and the Quartz 9F82 with +/- 5 seconds a year, both utilizing specially selected quartz crystals to ensure higher accuracy. These pieces symbolize the "Evolution of Practicality".

Caliber:9R15

Drive system: Spring Drive

Case Material:  Platinum 950

Case Back: See-through screw case back with sapphire crystal

Glass: High definition dual-curved sapphire crystal with anti-reflective coating

Accuracy: ±10 seconds a month

Water Resistance: 10 bar

Magnetic Resistance: 4800 A/m (60 gauss)

Weight: 105g

Case Thickness: 13.2mm

Case Diameter: 39.9mm

Jewels: 30

Limited Edition: 50 Pieces for the World

Features: 18kt Grand Seiko Gold Medalion on Rotor