SEIKO PROSPEX SRPL51K1 4R COMPACT MECHANICAL DIVER'S MEN WATCH

Seiko Prospex SRPL51K1 — Compact Automatic Diver's Watch

The Seiko Prospex SRPL51K1 is a compact automatic diver's watch built around the same 41.7mm case format that makes this Prospex line one of the most wearable in the dive watch segment. The classic blue dial gives it an immediate, purposeful character — the colour of the ocean rendered in a tone that reads clearly underwater and transitions naturally to everyday wear. Powered by the in-house 4R35 automatic calibre with GMT hand, hand-winding capability, and a 41-hour power reserve, it delivers professional 200M water resistance in a package sized for all-day comfort.

The Hardlex crystal protects the dial through active use, Lumibrite on the hands and hour markers ensures legibility in low light and at depth, and the screw-down crown reinforces the 200M water seal. The unidirectional rotating bezel handles dive timing safely, and the stainless steel bracelet completes a specification built for the water as much as for the wrist.

Key Features

• Seiko 4R35 automatic movement with manual winding — self-winding with the convenience of hand-winding when needed
• Approx. 41-hour power reserve — dependable performance through extended daily wear
• Accuracy: +45/-35 seconds per day — reliable automatic timekeeping
• GMT hand — additional time zone reference built into the 3-hand layout
• 200M Diver's water resistance — built for recreational diving and water sports
• Blue dial with baton markers — classic diver's colourway with clean, high-contrast legibility
• Lumibrite on hands and hour markers — superior legibility in low light and underwater conditions
• Unidirectional rotating bezel — purpose-built for safe and accurate dive timing
• 41.7mm stainless steel case — compact diver's proportions at 12.3mm slim profile
• Screw-down crown — water integrity protection for diving use
• Hardlex crystal — reliable scratch resistance for active daily use
• Date display — everyday practicality built in
• Stainless steel bracelet — durable, comfortable, and corrosion-resistant

Why You'll Love It

The SRPL51K1 is the Seiko Prospex diver for those who want the full professional specification — 200M water resistance, unidirectional bezel, Lumibrite, screw-down crown, GMT hand — without the case bulk that makes larger dive watches difficult to wear every day. At 41.7mm and 12.3mm thick it sits cleanly under a cuff, moves naturally on the wrist, and wears as comfortably on land as it performs in the water. The blue dial is the most versatile in the compact diver range — a colour that pairs equally well with casual and smart-casual wear, and reads with exceptional clarity at depth. The 4R35 calibre is one of Seiko's most proven automatic movements, the 41-hour reserve handles any weekend without wearing, and the Hardlex crystal keeps the dial protected through active daily use. A capable, well-priced everyday diver.

SRPL51K1 vs SRPL53K1 — Blue or Green?

Both models share identical specifications — the same 4R35 calibre, 41.7mm case, 12.3mm depth, Hardlex crystal, unidirectional bezel, Lumibrite, 200M water resistance, date display, and 41-hour power reserve. The difference is entirely in the dial colour and designation. The SRPL53K1 is the PADI Special Edition with a green dial — a collaboration piece for PADI-certified divers who want the partnership credential. The SRPL51K1 has the classic blue dial with no special edition designation — the cleaner, more versatile everyday choice. Same compact diver specification, two completely different identities.

The Seiko Prospex Story

Prospex is a combination of the words "Professional" and "Specifications." Seiko Prospex timepieces are designed to be practical, reliable, and durable — built to meet the high standards required in extreme environments for sports lovers and adventure seekers alike. The story begins in 1881, when Kintaro Hattori founded a clock and watch shop in Ginza, Tokyo — the business that would become the Seiko of today. Since 1965, when Seiko created Japan's first diver's watch, the Prospex dive line has stood for underwater precision and reliability. The SRPL51K1 carries that sixty-year legacy forward in its most compact and wearable expression.

Backed by Seiko's official warranty. Authentic Seiko Prospex watch, sold by authorised retailer City Chain Singapore.

Also available in PADI Special Edition green dial — shop the SRPL53K1. Explore the full Seiko Prospex Collection or browse all Seiko watches at City Chain Singapore.