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Seiko Prospex 'Tuna' 300m

Ref. S23633J1
  • £1,500.00
  • Seiko Prospex 'Tuna' 300m


Prospex Tuna 300m Saturation Diver’s Watch

This watch shape is affectionately nicknamed by Seiko fans as a ‘Tuna’ - because of its larger diameter and bold shape like a tuna tin - loved for decades since its release in 1975.

This new version has been updated from the original for increased legibility under water - the minute hand is emphasised by being arrow-shaped, simpler circular and triangular indices are easy to distinguish underwater as well as improved visibility of the indicator ring on the rotating bezel.

Seiko Prospex watches are designed for sports lovers and adventure seekers whether in the water, in the sky or on land. Since launching Japan’s first diver’s watch in 1965, Seiko’s innovative watchmaking has changed global dive watch standards.

  • Sapphire Glass Sapphire Glass
  • Professional Diver's Professional Diver's
  • Screw-down crown Screw-down crown
  • Diver's Watch 300m Diver's Watch 300m
  • Day/Date Window Window Day/Date Window Window
  • Unidirectional rotating bezel Unidirectional rotating bezel
  • Screw case back Screw case back


  • Case Diameter
  • Case Type
    Stainless steel
  • Dial Colour
  • Case thickness
  • Band Info
    Stainless Steel
  • Buckle type
    Three-fold clasp with secure lock


  • Movement type
  • Accuracy
    -15/+15 seconds per month
  • Calibre