GRAND SEIKO 9S Mechanical Automatic SBGR261 Men's WatchProduct Highlights Introducing a model that once housed the Caliber 9S67, now featuring the Caliber 9S65 without a power reserve indicator while maintaining its classic style. With a power reserve of approximately 3 days when fully wound, the stability of accuracy during actual use has been enhanced by adopting the latest mainspring and escapement made using MEMS (Micro Electro Mechanical Systems) technology. Reviving the traditional classical form