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Highlights:
- With only 600 pieces worldwide, this limited-edition design commemorates 60 years of Seiko’s heritage in innovative and reliable diving watches, which began with the 1965 launch of Japan and Seiko’s first ever Diver’s watch.
- This latest timepiece takes its inspiration from a key milestone in Seiko’s diving watch expertise – the 1968 Diver.
- The 2025 Marinemaster is Prospex's most advanced model yet, crafted from lightweight titanium for comfortable wearability.
- The superhard coating on the case and bracelet is paired with a DLC (Diamond-like Coating) on the bezel, for added scratch resistance.
- The Prospex 'Shinkai' will join the Japanese Agency for Marine-Earth Science and Technology (JAMSTEC) research team on their 2025 Arctic research expedition.
- Prospex and JAMSTEC have a long history together of enduring challenging environments, where the watches have been successfully put to the test in extreme conditions, far outperforming expectations.
- In 1983, two 600m Diver’s watches were depth tested onboard the 'Shinkai 2000', a research submersible. In 2014, both a quartz and an automatic 1000m Saturation Diver was tested onboard the 'Kaiko 7000', surpassing its specifications by continuing to perform at 3000m depth.
- Under a dual-curve sapphire glass is a blue dial made with a new structure of layered transparency, designed to express the ocean, as in its name 'Shinkai' meaning deep sea in Japanese.
- Crafted at the Shizukuishi Watch Studio, where Seiko’s finest mechanical calibres are developed, this robust Marinemaster is powered by the new in-house 8L45 movement.
- Accurate to +10/-5 seconds per day, with a three day power reserve.
- Prospex is a combination of the words 'Professional' and 'Specifications.' Seiko Prospex timepieces are designed to be practical, reliable and durable; to meet the high standards required in extreme environments for sports lovers and adventure seekers alike.
- The bracelet of this watch features a micro-adjustable clasp feature.
- Displays date at 3 o'clock.
- 600m water-resistant watch.
- 3-year manufacturer warranty.
| Warranty | 2 years |
| Edition | Seiko Prospex |
| Dial Colour | Blue |
| Date Feature | Date display at 3 o'clock position |
| Usually For | Men |
| Glass | Sapphire Crystal |
| Water Resistancy | 600 Metres |
| Case Width | 45mm |
| Case Thickness | 16mm |
| Case Material | Titanium |
| Band Material | Titanium |
| Band Width | 22mm |
| Band Type | Bracelet |
| Clasp Type | Three-fold |
| Bezel | Uni-directional |
| Crown | Screw-down |
| Movement | Automatic |
| Calibre | 8L45 |
| Jewels | 35 |
| Power Reserve | 72 Hours |
| Accuracy | -5/+10 seconds per day |
| Vibrations | 28,000 vibrations per hour (8 beats per second) |
| Magnetic Resistance | 4,800 A/m |
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