Grand Seiko 9SA5

Grand Seiko's most advanced mechanical movement featuring the revolutionary Dual Impulse Escapement where power is transferred directly from the escape wheel to the balance. Uses a free-sprung balance with a unique overcoil designed after 80,000 simulations. Twin barrels provide 80 hours power reserve despite the Hi-Beat 36,000 vph rate. 15% slimmer than previous Hi-Beat calibers thanks to horizontal barrel layout. MEMS technology used for escapement components.