The new calibre 9F85 has a time difference adjustment function which allows the hour hand to be changed without stopping the second hand, preserving high precision when the wearer changes time zones.
Every quartz crystal has different performance characteristics, only the very best are picked for Grand Seiko 9F Quartz movements. Aged and rigorously tested over a 3 months period, this ensures only the most accurate and best performing crystals are crafted into each timepiece.
Grand Seiko: the relentless quest for precise timekeeping from the pinnacle of Seiko Watch Corporation’s watchmaking. With leading watchmaking, durability and legibility, every Grand Seiko is still handmade in Japan by elite craftsmen and women.