Spring Drive Chronograph Evolution 9A Limited Edition Spring Drive Chronograph in the Evolution 9 Style 2022 is the 15th anniversary of Grand Seikos first Spring Drive chronograph. Commemorating this milestone, SBGC249 is a limited edition Spring Drive chronograph and the first chronograph in the Evolution 9 Collection. SBGC249 is made from High Intensity Titanium and measures 45. 3mm in diameter, 15. 8mm in thickness, and52. 6mm lug to lug. The bezel insert is sapphire, which makes it
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