About This Watch
The Grand Seiko Sport GMT SBGE257 exemplifies Grand Seiko's dedication to horological excellence. The Sport collection brings Grand Seiko's legendary precision to active lifestyles, with robust builds and bold designs. Powered by the Grand Seiko 9R66 with approximately 72 hours of power reserve, this 40.5mm Stainless Steel case houses a movement that represents years of refinement and innovation. The GMT function allows simultaneous tracking of two time zones, making this an ideal companion for travelers and those who work across international boundaries. Water resistant to 200 meters, it combines practical durability with refined aesthetics that discerning collectors appreciate. Established in 1960 with the singular goal of creating the ideal watch, Grand Seiko represents the pinnacle of Japanese watchmaking. Every timepiece is assembled by hand in either the Shizukuishi Watch Studio in Iwate or the Shinshu Watch Studio in Nagano, where master craftsmen pursue perfection through the philosophy of precision, beauty, and legibility.
Specifications
Movement
| Movement Type | Spring Drive |
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| Caliber | Grand Seiko 9R66 |
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| Power Reserve | 72 hours |
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| Frequency | 28,800 vph |
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| Jewels | 30 |
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Case
| Case Diameter | 40.5mm |
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| Case Thickness | 14.7mm |
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| Case Material | Stainless Steel |
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| Crystal | Sapphire with anti-reflective coating |
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| Bezel | Bidirectional rotating 24-hour |
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| Dial Color | Green |
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| Lug Width | 20mm |
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| Lug-to-Lug | 47.0mm |
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Features
| Water Resistance | 200m / 656ft |
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| Bracelet/Strap | Stainless steel bracelet |
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| Clasp | Three-fold clasp with push button release |
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| Weight | 169g |
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| Complications | DateGMTPower Reserve Indicator |
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