Grand Seiko Heritage – SBGR315G Automatic Watch


Automatic 3-Day Power Reserve – Caliber 9S65

Caliber 9S65 is automatic movement that typifies the whole 9S mechanical series. It is similar in design to the first generation of 9S calibers but offers enhanced performance.

MEMS (Micro Electro Mechanical System) is a technology first developed for semi-conductor manufacturing. It is used in the production of the escapement of Caliber 9S65 as it allows the creation of components that are lighter, of more complex shapes and more precisely engineered. While the winding system of its predecessor, Caliber 9S55, used Grand Seiko’s Magic Lever mechanism, Caliber 9S65 uses a reverser gear train system. Hardening the components allowed greater durability for this reverser.

Reference: SBGR315G

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Grand Seiko Heritage – SBGR315G Automatic Watch

Grand Seiko Heritage Collection Mechanical Watch



  • Exterior: Stainless steel
  • Case back: See-through & Screw case back
  • Glass Material: Dual-curved sapphire crystal
  • Glass Coating: Anti-reflective coating on inner surface
  • Case size: Diameter 40.0mm Lug-to-lug 46.6mm Thickness 13.0mm
  • Band width: 20mm
  • Clasp type: Three-fold clasp with push button release
  • The perimeter of Band: 195mm


  • Caliber no.: 9S65 Instructions
  • Movement Type: Automatic with manual winding
  • Power reserve: Approx. 72 hours(3 days)
  • Mean daily rate: +5 to -3 seconds per day (Mean daily rate is a mean value of daily rates in a condition where the movement before assembly in a case is measured in six positions in a fixed manner under artificially controlled environment for 12 days.)


  • Water resistance: 10 bar
  • Magnetic resistance: 4,800 A/m
  • Screw-down crown
  • 35 jewels

Reference: SBGR315G

Additional information


Grand Seiko




Stainless Steel

Watch Movement


Case Size