Seiko - Grand Seiko SBGR061 The caliber 9S65 has a power reserve of approximately 72 hours. An advanced hairspring and an escapement (escape wheel and palette) manufactured using the Micro Electro Mechanical
Seiko - Another Grand Seiko review (SBGR061)
Grand Seiko SBGR061 Mechanical Automatic Stainless Steel – Watchesmiles