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SEIKO PROSPEX – “Tuna” 300m Divers Watch S23633J1


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Seiko Prospex “Tuna” 300m Divers Bracelet Watch

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Seiko Prospex “Tuna” 300m Divers Watch

The Seiko Prospex “Tuna” 300m 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 and loved since its launch in 1975.

Case, Dial, Bracelet

With an imposing 47.7mm diameter case, the watch is designed with high visibility in mind. Firstly, simplified high-visibility hour markers and hands coated in Lumibrite make the dial legible and easy to read under water. Secondly, a uni-directional bezel surrounds the dial with bold, indices. Furthermore, the stainless steel bracelet is durable and practical. It secures to the wrist with a three-fold clasp with adjuster. Finally, a day and date indicator at 3 o’clock is a useful addition.

Water resistant to 300 m/1000 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” 300m 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
  • Stainless steel case with super hard coating
  • Uni-directional rotating bezel
  • Case dimensions: 47.7mm diameter, 46.7mm long, 14.1mm deep, 20mm lug width
  • Weight: 200g
  • Black dial – indexes and hands with Lumibrite
  • Stainless steel bracelet, three-fold clasp with secure lock & push button release, solid & slide adjuster
  • Sapphire crystal – anti-reflective coating on inner surface
  • Screw caseback
  • Screw-down crown
  • Water resistant 30 bar (300m)/1000ft (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

Metal Bracelet

Water Resistance


Based on 149 reviews
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  1. Elgharabawy Mostafa

    Verified reviewVerified review - view originalExternal link | saSaudi Arabia

    Extremely Professional Service, exact item received in a well packaged parcel, I would definitely return back 🙂

  2. Anonymous

    Verified reviewVerified review - view originalExternal link | gbEngland, United Kingdom

    Very straightforward ordering and delivered timeously!

  3. Caroline C.

    Verified reviewVerified review - view originalExternal link | gbEngland, United Kingdom

    Quick service and great communication. Strap arrived as promised and well packaged. Many thanks

  4. Anonymous

    Verified reviewVerified review - view originalExternal link | gbUnited Kingdom

    The website is easy to use and was able to order without any problem, customer service was good.

  5. Malcolm Bruce

    Verified reviewVerified review - view originalExternal link | gbScotland, United Kingdom

    From the very beginning of making an enquiry to placing my order for an Oris watch strap I was looked after by Suzie in a professional and friendly manner. I would recommend watch specialists without hesitation to my family and friends. 10/10 thank you for a brilliant experience 😊

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