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Seiko Prospex - 300M Tuna


3 Year Canadian Limited Warranty


1975 Saturation Diver's Watch Reinterpretation. Designed for those who treat life as the ultimate adventure, the Seiko Prospex line meets every challenge with technological excellence and style. Part of a rich legacy of innovation in high-intensity timekeeping, Prospex continues to celebrate a long history of sports watch excellence with recreations and reinterpretations of landmark achievements. Honoring the first watch designed to withstand the dangerous world of the professional diving, Seiko's 1975 saturation diver, this extraordinary reinterpretation retains the solid can-like lines and functionality of the original, improved with upgraded specifications and materials. Following ISO standards for diving to depths of up to 300 meters, this powerful saturation diver features a durable stainless steel case and black one-way rotating elapsed timing bezel, both with super-hard coating, as well as a screwdown crown and caseback. The arrow shaped minute hands, simple geometric indices, narrower bezel markers and LumiBrite enhancement offer sharper legibility, while the anti-reflective sapphire crystal provides maximum visibility. With secure silicone strap and day/date calendar, this updated design is powered by a unique extended-life quartz battery with increased torque, engineered specifically for diver's watches. 300m Water Resistant.


  • 1975 Saturation diver's modern interpretation
  • Black one-way rotating elapsed timing bezel
  • Black dial
  • Day/date calendar
  • LumiBrite hands and markers


Thickness: 14.1mm
Diameter: 47.7mm
Length: 46.7mm
CASE: Stainless steel case with super-hard coating
CRYSTAL MATERIAL: Dual-curved sapphire crystal with anti-reflective coating on the inner surface
STRAP: Stainless Steel
Caliber 7C46
5 years battery life
WATER RESISTANCE: 300 meters (1000 feet), follows ISO standards and is suitable for Saturation diving