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SEIKO PROSPEX – “Tuna” 1000m Divers Watch S23631J1


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Seiko Prospex “Tuna” 1000m Divers Quartz Silicone Strap Watch

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Included with product:
* Branded Packaging
* Completed Warranty
* Free Bracelet Sizing
* Free Gift Wrapping

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Seiko Prospex “Tuna” 1000m Divers Watch

The Seiko Prospex “Tuna” 1000m Divers Watch is a professional diver’s watch suitable for saturation diving. Due to the larger diameter and bold case shape like a tuna can, the watch has been affectionately nicknamed the “Tuna” by Seiko fans.

Case, Dial, Strap

Firstly, in a 2020 watch industry first, the case is made from Seiko’s “Ever-Brilliant Steel”. This is more corrosion-resistant than in most luxury watches. Consequently, it is only usually used in the marine industry. Secondly, with an imposing 49.4mm diameter, the watch is designed with high visibility in mind. Additionally, a black uni-directional bezel surrounds the dial with bold, Lumibrite coated indices. Similarly, simplified high-visibility hour markers and hands coated in Lumibrite make the dial legible and easy to read under water. Furthermore, the black silicone accordion strap is durable and practical.  A strap design invented by Seiko in 1975, it is a practical solution to the expansion and contraction of a diver’s wrist at different depths. Finally, a day and date indicator at 3 o’clock is a useful addition.

Water resistant to 1000 m/3300 ft, the “Tuna” has a screw caseback. Additionally, it has a screw-down crown which is located at 4 o’clock for safety reasons when diving. Equipped with a quartz movement, it has a battery life of approx. 5 years.

The Seiko Prospex “Tuna” 1000m Divers Watch has a bold, modern design. Ideal for the active man, it is the perfect companion for your next diving adventure. For complete peace of mind, it is also covered by a two year manufacturer’s warranty.

  • Quartz movement calibre 7C46
  • Accurate to +/- 15 seconds per month
  • Battery life: approx 5 years
  • Day/date display
  • One piece structure “Ever-Brilliant Steel” stainless steel case
  • Uni-directional rotating bezel with Lumibrite
  • Case dimensions: 49.4mm diameter, 49.4mm long, 16.3mm deep
  • Weight: 119g
  • Black dial – indexes and hands with Lumibrite
  • Black silicone accordion strap
  • Sapphire crystal
  • Screw caseback
  • Screw-down crown
  • Water resistant 100 bar (1000m)/33000ft (saturation diving)
  • Two Year Manufacturer’s Warranty
Additional information

Seiko Prospex

Movement Type

Battery Powered Quartz



Case Shape


Dial Colour


Material Type

Stainless Steel

Strap Type


Strap Colour


Water Resistance


Based on 157 reviews
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  1. AB

    Kept updated throughout the process and strap arrived sooner than expected.

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    Good range of products.

  3. PB

    From a easy to use website, a great customer service and fast delivery I thought Watch Specialist provided a great service. Even when I phoned with a query Suzie was very helpful, she dealt with my concerns in a professional but friendly way. My beautiful watch arrive two days after I order it.

  4. DW

    Easy to order, quick delivery and good customer service

  5. DK

    fast delivery, great prices, good and easy website

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