Grand Seiko Heritage SBGA439 Spring Drive Midnight Blue Watch
Grand Seiko Heritage SBGA439 Spring Drive Midnight Blue Watch
The Grand Seiko Heritage SBGA439 is a stainless-steel watch with a midnight-blue dial and Grand Seiko’s Spring Drive movement. It combines the classic Heritage Collection design with Caliber 9R65, offering approximately 72 hours of power reserve and average accuracy of ±1 second per day.
The watch features a 40.0 mm stainless-steel case, dual-curved sapphire crystal, screw-down crown, screw caseback, and stainless-steel bracelet with folding clasp and push-button release. Its functions include timekeeping, date display, and a power-reserve indicator.
The midnight-blue dial changes in appearance according to the light, while the Spring Drive seconds hand moves smoothly across the dial. Water resistance is rated at 10 bar, with magnetic resistance of 4,800 A/m.
Key Features
Grand Seiko Heritage Collection reference SBGA439
Caliber 9R65 Spring Drive movement
Approximately 72-hour power reserve
Midnight-blue dial with power-reserve indicator
40.0 mm stainless-steel case
Dual-curved sapphire crystal with anti-reflective coating
Date display and smooth Spring Drive seconds hand
10-bar water resistance
Specifications
Specification | Details |
Brand | Grand Seiko |
Model / Reference | SBGA439 |
Collection / Series | Heritage Collection |
Movement | Grand Seiko Caliber 9R65 |
Caliber | 9R65 |
Movement Type | Spring Drive, self-winding with manual winding |
Case Material | Stainless steel |
Case Diameter | 40.0 mm |
Case Thickness | 12.3 mm |
Lug Width | 20 mm |
Crystal | Dual-curved sapphire crystal with anti-reflective coating |
Dial Color | Midnight blue |
Dial Details | Date display and power-reserve indicator |
Caseback | Screw caseback |
Bracelet / Strap | Stainless-steel bracelet |
Clasp / Buckle | Folding clasp with push-button release |
Water Resistance | 10 bar |
Functions | Time, date, and power-reserve indicator |
Power Reserve | Approximately 72 hours |
Other | Magnetic resistance: 4,800 A/m; average accuracy: ±1 second per day / ±15 seconds per month |
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