Grand Seiko
Spring Drive Chronograph GMT SBGC203
Ref. SBGC203
The Grand Seiko SBGC203 is a landmark model featuring the brand’s innovative Spring Drive movement (caliber 9R86), combining mechanical precision with quartz-like accuracy and a 72-hour power reserve. It is the first Grand Seiko chronograph with GMT functionality, blending sporty durability (100m water resistance) and luxury craftsmanship, including a screw-down caseback and transparent caseback showcasing the movement. Part of the Grand Seiko Sport collection, it is celebrated for its bold design and technical innovation, often compared to high-end Rolex models.
weight187 grams (bracelet included)
crystalDual-curve sapphire with antireflection coating
braceletStainless steel with three-fold clasp
movement9R86, Spring Drive, automatic, 72-hour power reserve, ±15 seconds per month accuracy, 50 jewels
functionsDate, chronograph, GMT (24-hour hand), power reserve indicator, hacking seconds
lug width21
dial colorBlack
case length51.2
case diameter43.5
case materialStainless steel
case thickness16.1
water resistance100
magnetic resistance4,800 A/m
year2019-present
A registered Grand Seiko SBGC203 carries a permanent RGATT passport: origin, history and owners, verifiable by anyone, and a documented history makes a watch easier to sell.