LIMITED EDITION PROSPEX MARINEMASTER

Seiko Prospex Marinemaster 1968 Heritage JAMSTEC Limited Edition – 1 of 1,000

A Legacy of Exploration. A Masterpiece of Japanese Watchmaking.

Discover the extraordinary craftsmanship of the Seiko Prospex Marinemaster 1968 Heritage JAMSTEC Limited Edition, an exceptional timepiece that celebrates Seiko’s pioneering heritage in professional diving watches.

Limited to just 1,000 pieces worldwide, this exclusive creation combines the iconic design of Seiko’s historic 1968 diver’s watch with advanced mechanical engineering, refined finishing, and uncompromising performance.

Designed for collectors and watch enthusiasts who appreciate precision, innovation, and timeless elegance.

A Heritage Beneath the Surface

Seiko’s diving legacy began in 1965 with Japan’s first diver’s watch, later accompanying Japanese Antarctic Research Expeditions between 1966 and 1969.

In 1968, Seiko introduced Japan’s first 300-meter water-resistant diver’s watch, establishing a new benchmark in professional underwater timekeeping.

Inspired by this historic achievement, the Marinemaster 1968 Heritage honors the original silhouette, distinctive 4 o’clock crown, and enduring spirit of exploration.

Exceptional Craftsmanship & Refined Design

Every detail reflects Seiko’s commitment to excellence.

The deep black dial features a sophisticated fine-grain texture designed to minimize reflections, while precisely beveled hour markers enhance visibility from multiple angles.

A polished ceramic bezel insert provides exceptional scratch resistance, complemented by a dual-curved sapphire crystal with an internal anti-reflective coating.

Powerful LumiBrite illumination on the hands, indexes, and bezel ensures outstanding readability, even in challenging underwater environments.

Caliber 8L45 – Mechanical Excellence

At the heart of this remarkable timepiece is Seiko’s prestigious Caliber 8L45, a high-performance automatic mechanical movement representing generations of Japanese watchmaking expertise.

Engineered for superior precision and reliability, the movement offers:

• Approximately 72 hours of power reserve
• Accuracy of +10 to -5 seconds per day
• 28,800 vibrations per hour
• 35 jewels
• Automatic and manual winding capabilities

With its refined mainspring construction and meticulous accuracy adjustments, Caliber 8L45 represents one of Seiko’s finest mechanical achievements.

Innovative Comfort & Performance

The newly developed stainless steel bracelet clasp features a sophisticated slide-adjustment mechanism, allowing adjustments of up to 16mm in precise 2mm increments.

Designed for effortless operation and a personalized fit, the clasp enhances comfort without compromising the watch’s elegant appearance.

With professional 300-meter water resistance, the Marinemaster delivers the durability and dependability expected from Seiko’s distinguished diving collection.

Technical Specifications

Movement

• Caliber: 8L45
• Movement Type: Automatic with manual winding
• Accuracy: +10 to -5 seconds per day
• Power Reserve: Approximately 72 hours (3 days)
• Jewels: 35
• Frequency: 28,800 vibrations per hour (8 beats per second)
• Functions: Date display and stop-seconds function

Case & Bracelet

• Case Material: Stainless steel
• Bezel: Stainless steel with ceramic insert
• Case Diameter: 42.6mm
• Case Thickness: 14.1mm
• Lug-to-Lug: 49.3mm
• Lug Width: 20mm
• Crystal: Dual-curved sapphire
• Crystal Coating: Anti-reflective coating on inner surface
• Luminescence: LumiBrite on hands, indexes, and bezel
• Clasp: Three-fold clasp with push-button release and sliding micro-adjustment system

Performance & Additional Features

• Water Resistance: 300 meters / 1,000 feet
• Magnetic Resistance: 4,800 A/m
• Unidirectional rotating bezel
• Screw-down crown
• Screw case back
• Individually engraved serial number
• LIMITED EDITION engraving on case back

Exclusivity in Every Detail

Only 1,000 pieces worldwide.

Each timepiece features an individually engraved serial number, making it a distinctive addition to any serious watch collection.

A remarkable expression of Seiko’s diving heritage, elevated through contemporary craftsmanship and mechanical precision.

Own a piece of Japanese horological history.