
Product Description
The SPB445J1 celebrates traditional Japanese craftsmanship with its handcrafted Arita Porcelain dial. Each dial is individually molded and fired at high temperatures, producing natural variations that make every piece truly one-of-a-kind. Paired with Seiko’s refined 6R5H movement, 72-hour power reserve, and dual-curved sapphire crystal, this model blends artisanal beauty with modern watchmaking precision.
| SKU | SPB445J1 |
|---|---|
| Case Material | Stainless steel (super hard coating) |
| Case Size | Thickness: 12.5mm • Diameter: 40.6mm • Lug-to-lug: 49.1mm |
| Crystal | Dual-curved sapphire crystal |
| Crystal Coating | Anti-reflective coating on inner surface |
| Clasp | Three-fold clasp with push button release |
| Distance Between Lugs | 20 mm |
| Water Resistance | 10 bar |
| Magnetic Resistance | 4,800 A/m |
| Weight | 150.0 g |
| Features |
Arita porcelain dial See-through & screw case back *Handcrafted Arita porcelain dials may include small dimples, dots, or color variations — each dial is unique. |
| Caliber Number | 6R5H |
|---|---|
| Movement Type | Automatic with manual winding |
| Precision | +25 to −15 seconds per day |
| Power Reserve | Approx. 72 hours (3 days) |
| Jewels | 24 |
| Functions |
24-hour hand Stop second hand function |
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