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The Seiko Prospex Marinemaster HBF001J1 marks the return of one of Seiko's most revered names in professional diving watches. Inspired by the iconic 1968 diver that helped establish Seiko as a pioneer of underwater timekeeping, this modern reinterpretation combines the unmistakable silhouette of the original with Seiko's latest mechanical movement and refined engineering.
Designed as the flagship model within the Prospex collection, the Marinemaster HBF001J1 is built for serious divers while offering the refinement and comfort expected of a luxury mechanical sports watch. Featuring a satin black dial, ceramic bezel and the new Calibre 8L45, it represents the pinnacle of Seiko's mechanical dive watch expertise.
Inspired by the 1968 Original
In 1968, Seiko introduced Japan's first high-beat professional diver's watch, setting new standards for reliability and underwater performance. The HBF001J1 faithfully carries forward that legacy, retaining the flowing case profile, distinctive 4 o'clock crown position and purposeful design language that made the original such an icon.
The satin-finished black dial has been specially developed to minimise reflections beneath the water's surface, providing exceptional contrast and legibility in challenging conditions. Applied indexes with polished bevels catch the light beautifully, while generous LumiBrite application ensures outstanding visibility in darkness. A black ceramic bezel adds exceptional scratch resistance while enhancing the watch's premium appearance.
Powered by the New Seiko Calibre 8L45
At the heart of the Marinemaster beats the newly developed Seiko Calibre 8L45, one of the finest mechanical movements produced by Seiko outside of Grand Seiko.
Hand-assembled at the prestigious Shizukuishi Watch Studio in Japan, the movement has been specifically engineered for professional dive watches and delivers outstanding precision, durability and reliability.
The movement features:
- Approx. 72-hour power reserve
- Accuracy of +10/-5 seconds per day
- Automatic and manual winding
- Stop-seconds function
- 35 jewels
- 28,800 vibrations per hour (4Hz)
The 8L45 represents the most accurate mechanical movement currently used in Seiko's Prospex collection, making it a fitting calibre for the Marinemaster flagship.
Built for Professional Diving
Engineered to ISO diving standards, the HBF001J1 is every inch a professional tool watch. The stainless steel case features Seiko's Super-Hard Coating, improving scratch resistance while preserving the refined brushed finish.
The streamlined case houses a screw-down crown, screw case back and unidirectional ceramic bezel, delivering 300 metres of water resistance. A dual-curved sapphire crystal with anti-reflective coating provides outstanding clarity, while the newly developed sliding micro-adjustment clasp allows the bracelet to be adjusted by up to 16mm without tools, ensuring exceptional comfort whether worn over a wetsuit or directly on the wrist.
A New Benchmark for Seiko Divers
The Marinemaster HBF001J1 represents the next evolution of Seiko's professional dive watch lineage. Combining heritage-inspired design with one of the brand's finest mechanical movements, premium finishing and genuine professional capability, it is a watch equally suited to collectors, enthusiasts and serious divers.
With its timeless black dial, advanced engineering and unmistakable Marinemaster pedigree, the HBF001J1 stands as one of the most significant additions to the Prospex collection in recent years.
Key Features
- Reference: HBF001J1
- Collection: Seiko Prospex Marinemaster
- Seiko Calibre 8L45 automatic movement
- Automatic with manual winding
- Approx. 72-hour power reserve
- Accuracy: +10/-5 seconds per day
- 35 jewels
- 42.6mm stainless steel case with Super-Hard Coating
- Satin black professional diver's dial
- Black ceramic unidirectional rotating bezel
- Date display
- Dual-curved sapphire crystal
- Anti-reflective coating on inner surface
- LumiBrite hands, indexes and bezel
- Screw-down crown
- Stainless steel bracelet with sliding micro-adjustment clasp
- 300m professional diver's water resistance
- Magnetic resistance: 4,800 A/m
- Made in Japan
We offer complimentary secure delivery to addresses in the UK.
For all online orders Deacons will arrange delivery of the goods in accordance with the delivery details provided by you. Delivery will be made by Royal Mail Special Next Day delivery requiring a signature on receipt. Please allow at least 3 - 5 working days from acceptance of your order for delivery. Please note that we can only deliver to UK addresses.
We hope you will love your purchase, but should you change your mind, a refund or exchange on online purchases can be requested within 14 days of receiving delivery. If you wish to return an item, it must be in its original unused condition and packaging.
Refunds will be provided against the original payment method or credit/debit card used to complete the purchase. If you wish to return your product, please use a secure return service with the appropriate insurance level and with full tracking, as you are responsible until this product is received. If your return is due to a damaged or defective product then we will refund the delivery charges and pay your costs of returning it to Deacons.
All returns must be sent to D&S Limited, 11-15 Wood Street, Old Town, Swindon, SN1 4AN
