Seiko Prospex Marinemaster HBF001J1 Men's Watch • Sapphire Crystal • 300m Water-Resistant

The Seiko Prospex Marinemaster HBF001J1 is a remarkable dive watch masterpiece from Seiko, reimagining the heritage collection of 1968 as a modern high-performance timepiece. The robust stainless steel case, measuring 42.6mm in diameter and 14.1mm in thickness, houses Seiko's in-house automatic movement with manual winding, achieving a precision of +10 to -5 seconds per day. The watch is certified water-resistant to 300 metres, making it a true professional diver's watch.

Equipped with a doubly curved sapphire crystal with anti-reflective inner coating, along with LumiBrite on the hands, indices and bezel, the Marinemaster HBF001J1 offers excellent legibility even in low-light conditions. The unidirectional rotating bezel in stainless steel with a ceramic surface, the screw-down crown and screw-down case back complete the professional dive watch concept. A triple-folding clasp with push-button release and sliding adjustment ensures a secure fit on the wrist.

Key Features of the Seiko HBF001J1 Watch

• Automatic movement Calibre 8L45 with manual winding, approximately 72 hours of power reserve and 28,800 vibrations per hour for precise timekeeping
• Doubly curved sapphire crystal with anti-reflective inner coating and LumiBrite luminous material on hands, indices and bezel
• 300 metres water resistance thanks to the screw-down crown, screw-down case back and unidirectional rotating bezel with ceramic surface

Care Instructions for Wristwatches

Care & Cleaning

• Daily: Wipe case and bracelet with a soft, dry cloth to remove dirt and perspiration.
• Water-resistant watches: Clean with mild soapy water and a soft brush, rinse, dry thoroughly.
  Important: Screw the crown down firmly beforehand!!!
• Not water-resistant: Clean only dry or slightly damp, do not use water or cleaning agents.
• Avoid: Aggressive agents, perfume, cosmetics and heat.
• Leather straps: Do not soak, clean only slightly damp and allow to dry away from heat.
• Water resistance: Do not wear in the shower or bath, have checked annually.
• Battery (quartz): Have a depleted battery replaced immediately.
• Mechanical watches: Service by a master watchmaker every 5 years.

Storage & Handling

• Store watch separately, not directly with other jewellery (risk of scratching).
• Set mechanical watches down when winding, do not leave the crown pulled out.