Seiko Prospex SPB485J1 — Automatic Diver's Watch

The Seiko Prospex SPB485J1 is a professional automatic diver's watch built around the in-house 6R55 calibre — a 72-hour power reserve movement that has become one of Seiko's most trusted automatic platforms. The black dial with baton markers and Lumibrite on the hands and hour markers gives it a clean, high-contrast legibility that reads clearly at depth, and the 41.3mm stainless steel case with screw-down crown and unidirectional rotating bezel meets the full Diver's 300M specification. A sapphire crystal and a precise +25/-15 seconds per day accuracy rating complete the brief — a capable, well-made professional diver's watch at a considered price point.

The stainless steel bracelet is built for durability and all-day comfort, and the 12.5mm slim profile keeps the 41.3mm case from wearing heavier than its proportions suggest. Hand-winding capability adds a practical layer of reliability for situations where wrist movement alone is insufficient to maintain the reserve. Lumibrite on both hands and hour markers ensures the watch is readable from the moment the lights go out.

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 ISO professional diving standards
• Black dial with baton markers — clean, high-contrast legibility at depth
• 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
• Sapphire crystal — premium scratch resistance and superior optical clarity
• 41.3mm stainless steel case — professional dive watch proportions at 12.5mm slim profile
• Screw-down crown — water integrity protection for diving use
• Date display — everyday practicality built in
• Stainless steel bracelet — durable, comfortable, and corrosion-resistant

Why You'll Love It

The SPB485J1 is the Seiko Prospex diver for the buyer who wants the 6R55 platform — the most capable automatic calibre Seiko fits to its mid-range dive watches — in a clean, understated execution that does not call attention to itself. The black dial and stainless steel case is the most versatile combination in the dive watch vocabulary: it works at depth, at a restaurant, and everywhere between. The 72-hour power reserve means it is ready after any length of weekend, the Diver's 300M rating means it is rated for serious underwater use, and the sapphire crystal keeps it looking new through active daily wear. A well-specified, no-distraction professional diver's watch.

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 SPB485J1 carries that sixty-year legacy forward in a modern 300M automatic diver's watch powered by one of Seiko's most capable in-house calibres.

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

Explore the full Seiko Prospex Collection or browse all Seiko watches at City Chain Singapore.