Seiko Prospex SRP789J1 “Coke Turtle” Automatic Diver 200M – Made in Japan

The Seiko Prospex SRP789J1, affectionately known among collectors as the “Coke Turtle,” combines one of Seiko’s most iconic dive-watch case designs with a bold black-and-red bezel that gives this model unmistakable wrist presence.

Inspired by Seiko’s legendary cushion-case divers of the 1970s, the SRP789J1 features the famous Turtle case—large, rugged and instantly recognizable, yet surprisingly comfortable thanks to its curved profile and short lugs. The black dial is fitted with oversized LumiBrite markers and broad luminous hands for outstanding legibility in low-light conditions.

Its defining feature is the black-and-red “Coke” unidirectional bezel, a color combination that has made this reference particularly popular with Seiko enthusiasts. The day-date display at 3 o’clock adds everyday practicality while maintaining the classic Seiko diver aesthetic.

Power comes from Seiko’s proven 4R36 automatic movement, featuring approximately 41 hours of power reserve, manual winding and hacking seconds. The J1 version carries the desirable “Made in Japan” dial designation, distinguishing it from other market variants.

With 200 meters of water resistance, a screw-down crown positioned at 4 o’clock and Seiko’s durable Hardlex crystal, the SRP789J1 is a genuine Prospex diver built for real-world use.

Specifications

• Brand: Seiko

• Collection: Prospex

• Reference: SRP789J1

• Nickname: Coke Turtle

• Movement: Seiko Caliber 4R36 Automatic

• Power Reserve: Approximately 41 hours

• Manual Winding: Yes

• Hacking Seconds: Yes

• Functions: Hours, minutes, seconds, day & date

• Case: Stainless steel Turtle-style cushion case

• Case Diameter: Approximately 45 mm

• Dial: Black

• Bezel: Red & black “Coke” unidirectional rotating bezel

• Crystal: Hardlex

• Lume: Seiko LumiBrite

• Water Resistance: 200 meters / 660 feet

• Crown: Screw-down crown at 4 o’clock

• Country Marking: Made in Japan

Why collectors like it: The SRP789J1 hits a sweet spot in the modern Seiko Prospex lineup: the heritage Turtle case, classic 4R36 automatic movement, bold Coke bezel and the sought-after J1 Made-in-Japan designation. It has the unmistakable character of a vintage Seiko diver while offering the reliability and convenience of a modern automatic.

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Seiko Prospex SRP789J1 Coke Turtle Automatic Diver 200M Made in Japan

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Discover the Seiko Prospex SRP789J1 Coke Turtle, featuring a red and black dive bezel, 4R36 automatic movement, 200M water resistance and Made in Japan designation.