HBF002J1
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HBF002J1
Developed in partnership with JAMSTEC (Japan Agency for Marine-Earth Science and Technology), the Seiko Prospex Marinemaster HBF002J1 is a high-end, professional class saturation diver. Marking a partnership that spans more than 20 years, this new edition unites an artistic, multi-layered dial, drawn from polar exploration, with high-end mechanical watchmaking. It comes as a limited edition of 1,000 units sold all over the world.
Key Product Highlights
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Polar Icebreaker Design Concept: The dial captures the spirit of the Arctic, drawing inspiration from the Mirai II (Japan’s first icebreaking polar research vessel). It features a distinct textured pattern resembling a ship’s trail through sea ice, finished with a polished, thick transparent lacquer that creates a glass-like depth.
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Striking Vertical Gradient: Features a unique vertical blue gradient dial that lightens toward the top and deepens toward the center, perfectly complemented by a rich blue ceramic bezel insert, a gold-colored seconds hand, and a contrasting white inner minute flange.
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Premium Shizukuishi-Crafted Caliber: Driven by the high-grade manufacture Caliber 8L45, meticulously assembled and regulated alongside Grand Seiko movements to deliver superior precision and durability.
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Upgraded On-the-Fly Sliding Clasp: Includes Seiko’s newly redesigned solid steel folding clasp, allowing smooth micro-adjustments up to 16mm in 2mm increments without having to open the clasp.
Technical Specifications
| Component | Specification |
| Brand / Collection | Seiko Prospex (Marinemaster Flagship Series) |
| Reference Number | HBF002J1 (HBF002) |
| Exclusivity | Limited Edition of 1,000 pieces worldwide |
| Movement Caliber | Seiko Manufacture Caliber 8L45 (Automatic with manual winding) |
| Frequency / Jewels | 28,800 vibrations per hour (8 beats per second) / 35 Jewels |
| Power Reserve | Approx. 72 hours (3 days) |
| Stated Accuracy | +10 to -5 seconds per day |
| Case & Bracelet Material | Stainless Steel with DiaShield (Super-Hard Coating) |
| Bezel | Unidirectional rotating stainless steel with a polished blue ceramic insert |
| Case Dimensions | Diameter: 42.6mm |
| Lug Width | 20mm |
| Crystal | Dual-curved Sapphire Crystal with anti-reflective coating on inner surface |
| Luminescence | High-intensity LumiBrite on hands, indices, and bezel pip |
| Water Resistance | 300m / 1000ft Diver’s (Professional Saturation Diving) |
| Case Back & Crown | Screw-down crown (at 4 o’clock) and solid screw case back |
| Case Back Markings | Engraved with “JAMSTEC LIMITED EDITION” and unique serial number |
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