SEIKO PROSPEX SPB451J1 1965 REVIVAL DIVER’S 3-DAY 300M MEN WATCH

Seiko Prospex SPB451J1 — 1965 Heritage Automatic Diver's Watch

The Seiko Prospex SPB451J1 is a modern re-interpretation of the 62MAS — Seiko's and Japan's first ever professional diver's watch, introduced in 1965. That watch set a benchmark for reliability in the most extreme conditions on Earth: worn across four missions to the Japanese Antarctic Research Expedition, and later on expeditions to the North and South Poles and to the summit of Mount Everest. The SPB451J1 presents that heritage in its most ocean-connected expression: a blue dial that references the sea itself, set in a 40mm silver stainless steel case that preserves the compact, purposeful proportions of the original 62MAS.

Powered by the in-house 6R55 automatic calibre with a 72-hour power reserve, hand-winding capability, and accuracy of +25/-15 seconds per day, the SPB451J1 is mechanically confident and practically complete. The Diver's 300M water rating, curved sapphire crystal, and screw-down crown meet the full professional dive specification. Lumibrite on the hands and hour markers ensures readability at depth, and the silver stainless steel bracelet completes a specification built for serious underwater use and comfortable everyday wear.

Key Features

• Seiko 6R55 automatic movement with manual winding — self-winding with the convenience of hand-winding when needed
• Approx. 72-hour (3-day) power reserve — reliable performance through a long weekend without wearing
• Accuracy: +25/-15 seconds per day — dependable automatic timekeeping
• Diver's 300M water resistance — built to the highest professional diving standards
• Blue dial with baton markers — ocean-connected colourway faithful to the 1965 Heritage design language
• 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
• Curved sapphire crystal — premium scratch resistance and superior optical clarity
• 40mm silver stainless steel case — 1965 Heritage proportions at 13.0mm slim profile
• Screw-down crown — water integrity protection for diving use
• Date display — everyday practicality built in
• Silver stainless steel bracelet with three-fold clasp — durable, comfortable, and corrosion-resistant

Why You'll Love It

The SPB451J1 is the 1965 Heritage diver in the colour that most directly evokes the ocean it was built for — and in the context of a watch with the 62MAS heritage, the blue dial is not just a colour choice, it is a statement of purpose. The 40mm case is smaller and more faithful to the original proportions than many modern dive watches, the blue dial reads with exceptional clarity against the silver case, and the 6R55 calibre's 72-hour reserve and +25/-15 sec/day accuracy represent genuine mechanical quality. A Diver's 300M watch that carries sixty years of polar and mountain heritage in a 40mm case — and wears with the ease of an everyday watch.

SPB451J1 vs SPB453J1 — Blue or Black Dial?

Both models share identical specifications — the same 6R55 calibre, 40mm silver stainless case, 13.0mm depth, Diver's 300M water resistance, curved sapphire crystal, screw-down crown, unidirectional bezel, Lumibrite, and date display. The difference is entirely in the dial colour. The SPB451J1 has a blue dial — the most ocean-connected and classically diver-coded choice in the 1965 Heritage range. The SPB453J1 has a black dial — the most understated, most versatile, and most historically faithful to the original 62MAS. Same 1965 Heritage specification, two completely different characters.

The Story Behind the 62MAS and 1965 Heritage

In 1965, Seiko created Japan's first professional diver's watch — the 62MAS. Built to withstand 150 metres of water pressure and tested in Japan's most demanding underwater conditions, it became the go-to timepiece for the Japanese Antarctic Research Expedition, worn across four separate missions to one of the most inhospitable environments on Earth. Its reliability at extreme depth, temperature, and pressure made it the natural choice for expeditions to the North and South Poles and to the summit of Mount Everest. The 1965 Heritage series preserves the essential design DNA of that original — the case proportions, the dial layout, the bezel character — while adding sixty years of refinement in materials, movement, and water resistance.

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 SPB451J1 carries that sixty-year legacy forward in its most ocean-connected expression.

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

Also available in black dial — shop the SPB453J1. Explore the full Seiko Prospex Collection or browse all Seiko watches at City Chain Singapore.