Seiko Prospex Marinemaster 1968 Heritage HBF001

A deep-sea legend reborn with modern precision

Seiko’s journey in diver’s watchmaking began in 1965 with Japan’s first diver’s watch, which accompanied members of the Japanese Antarctic Research Expedition to the South Pole from 1966 to 1969. This model was followed by the creation of the nation’s first 300m water-resistant diver’s watch in 1968.

In the decades since, Seiko has developed new technologies, designs, and features that have made its diver’s watches a trusted favorite of professionals and enthusiasts worldwide.

Based on the design of the 1968 diver’s watch, a regular model equipped with Caliber 8L45 joins the Marinemaster series.

Inheriting the flowing silhouette and the 4 o’clock crown design of the 1968 model, it proudly bears the name ‘1968 Heritage Diver’s Watch.’ Its appeal lies not only in its outstanding performance, but also in the refined beauty of its exterior design and the meticulous finishing evident in every detail.

The dial’s deep black hue and fine-grain texture minimize light reflection from the dial while the beveled edges of the indexes catch light from any angle, delivering high visibility. The bezel insert, made from glossy ceramic, offers excellent scratch resistance.

The watch features an updated clasp that offers easy adjustments of up to 16mm in 2mm increments by sliding the button inside. Even when the clasp is closed, the extension can be retracted, ensuring comfortable and effortless operation.

Specifications:

• Case: 42.6mm Stainless Steel (14.1mm thick, 49.3mm lug-to-lug)
• Movement: Caliber 8L45 (Automatic with manual winding)
• Power Reserve: Approx. 72 hours(3 days)
• Jewels: 35 Jewels
• Frequency: 28,800 vibrations per hour (8 beats per second)
• Functions: Stop second hand function, date display
  
• Bezel:  Stainless steel unidirectional rotating bezel with ceramic display
• Crystal: Dual-curved sapphire with anti-reflective coating on inner surface
• Dial: Textured black dial with LumiBrite on hands and index(es) 
• Water Resistance: 300m / 1000ft diver's
• Magnetic Resistance: 4,800 A/m
• Crown: Screw-down crown
• Case Back: Screw-down
• Strap/Bracelet: Stainless steel bracelet with three-fold clasp ＆push button release, solid & slide adjuster