The Grand Seiko Spring Drive SBGA299 automatic with power reserve indicator is a versatile 40.5mm stainless steel men's watch from the premier watch brand of Japan's foremost watch manufacture. With a Spring Drive automatic caliber, 100-meter water resistance, and a robust stainless steel bracelet, this is a full-service sports watch.
The Grand Seiko SBGA299 includes the post-2017 "Grand Seiko" signature at 12 o'clock on its dial. the silver sunburst dial base is adorned with diamond polished hour indices, a power reserve indicator, and a date window. Dauphine hands track hours and minutes, and Seiko Lumibrite luminant keeps the SBGA299 visible after dark.
A Grand Seiko automatic Spring Drive caliber 9R65 keeps time with quartz precision; +/-15 seconds per month is the rated accuracy. The movement pivots on 30 jewels and boasts a 72-hour (3 day) power reserve. Stop seconds (hacking), a quickset date, and adjustment by a Grand Seiko watchmaker round out the features.
Spring Drive is unique in the watch world due to its exclusive reliance on spring energy to drive the train, hands, and barrel. No batteries or capacitors are included, and a Spring Drive movement includes no motors. The continuous smooth sweep of the hand is the product of a unidirectional governing wheel that accelerates or slows the watch to maintain correct time. Induced electrical current produced by the spring's energy activates a quartz oscillator that paces the rotating of the governing wheel and the hands that it controls.
Grand Seiko's stainless steel case of 40.5mm is polished using the brand's distinctive "Zaratsu" polish. This is a tin plate method by which Grand Seiko artisans press the steel surfaces directly against a spinning tin wheel. A matching stainless steel bracelet with deployant clasp is included. The screw-down crown and solid caseback enable the SBGA299 to boast a water resistance rating of 100 meters.