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Grand Seiko Spring Drive
SBGC203
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Designed with a stainless steel case and bracelet, this 43.5mm Grand Seiko Caliber 9R86 Chronograph, features the signature Grand Seiko clear ridges on the facets of the case and the diamond-cut hands and markers with red 24-hour hand on a black dial. Spring Drive, a unique Seiko movement that requires neither a battery nor an electric motor, makes it a completely self-contained system. Its power is derived from a mainspring, just like a mechanical watch, and its accuracy is controlled by the precise signal of a quartz oscillator. These watches are all accurate to ±10 seconds per month, a level that is higher than any other existing spring-wound watch in the world. Featuring a see-through caseback, Spring Drive movement allows for self and automatic winding capabilities and features 50 jewels, with accuracy +/- 1 second per day with over 72 hours power reserve. 100M Water Resistant
| Case | Stainless Steel |
| Case Size | 43.5mm |
| Movement | Spring Drive |
| Dial | Black |
| Functions | Date, GMT, Dual Time with 24 hour display, Chronograph |
| Power Reserve | Approximately 72 hours |
| Water Resistance | 10 bars |
| Bracelet | Stainless Steel |
| Buckle | Three fold clasp with push button release |
| Warranty | 5 Years |