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The Seiko Prospex Professional Diver’s "Darth Tuna" Watch S23631J1 is an eye-catching timepiece, affectionately known as the 'Tuna' among Seiko enthusiasts due to its larger diameter and distinctive, bold shape reminiscent of a tuna tin. Embraced by watch lovers for decades, this watch stands out for its unique design and robust functionality, especially since its initial release.


The accordion-style silicone strap, a design innovation by Seiko dating back to 1975, offers a perfect blend of durability and comfort. This practical solution addresses the expansion and contraction of a diver's wrist at various depths, ensuring a secure and comfortable fit. The simplified indices enhance underwater readability, a crucial feature for diving enthusiasts. The case back proudly displays adherence to the new ISO standard, emphasizing its capability as a diver's watch, suitable for saturation diving at specific depths.


In a groundbreaking move for the watch industry in 2020, Seiko introduced "Ever-Brilliant Steel" to this watch—a grade of stainless steel more corrosion-resistant than that used in many luxury watches, typically reserved for marine applications. Seiko Prospex watches, crafted for sports and adventure, whether underwater, in the sky, or on land, have consistently set global standards since the introduction of Japan’s first diver’s watch in 1965.


Now available at MVS Watches in unworn, preowned condition, this Seiko Prospex Professional Diver’s "Darth Tuna" Watch S23631J1 comes with free UK shipping, inviting watch enthusiasts to own a timepiece that embodies innovation, durability, and style.

Seiko Prospex Professional Diver’s "Darth Tuna" Watch - S23631J1

£1,500.00 Regular Price
£1,400.00Sale Price
  • Seiko Prospex Professional Diver's


    • REFERENCE: S23631J1
    • CONDITION: Unworn with full set
    • GUARANTEE DATED: Jun 2021
    • MATERIAL: Stainless steel
    • DIAL: Black
    • BRACELET: Silicone
    • DIAMETER: 49.4mm
    • BEZEL: Uni-directional dive bezel
    • CROWN: Screw-down
    • CRYSTAL: Sapphire
    • WATER RESISTANCE: Water-resistant to 1000m
    • MOVEMENT: Seiko in-house 7C46 quartz
    • ACCURACY: +15 sec/month
    • BATTERY LIFE: Approximately 5 years
    • CLASP: Pin buckle

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