Seiko Prospex SPB383J1 Specifications
| Category | Component / Feature | Specification Details |
|---|---|---|
| Movement | Caliber Number | Seiko In-House Caliber 6R54 |
| Movement Type | Automatic with manual winding capacity | |
| Power Reserve | Fully wound: ~72 hours (3 days) | |
| Accuracy | +25 to -15 seconds per day | |
| Functions | 24-hour hand (GMT), Stop second hand (Hacking) | |
| Case & Build | Case Material | Stainless steel with DiaShield (hard coating) |
| Glass Material | Sapphire crystal (inner anti-reflective coating) | |
| Bezel Material | Ceramic (black, unidirectional rotating, 120-click) | |
| Luminescence | Lumibrite on hands, indexes, and bezel pip | |
| Dimensions | Diameter | 42.0 mm |
| Thickness | 12.9 mm | |
| Lug-to-Lug | 48.6 mm | |
| Lug Width | 20.0 mm | |
| Weight | 176.0 g | |
| Capability | Water Resistance | Diver’s 200 meters / 660 feet (ISO certified) |
| Magnetic Resistance | 4,800 A/m | |
| Band | Clasp Type | Three-fold clasp, secure lock, push-button release |
| Extension | Integrated slide-adjusting diver’s extension | |
| Design | Dial Color | Matte black |
| Accent Details | Gold-colored GMT hand and GMT text dial printing |
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