Seiko Prospex SPB483J1 — Automatic Diver's Watch

The Seiko Prospex SPB483J1 is a professional automatic diver's watch powered by the in-house 6R55 calibre — one of Seiko's most trusted automatic platforms, with a 72-hour power reserve and accuracy of +25/-15 seconds per day. The blue dial gives it an immediate connection to the ocean it is built for: a colour that reads clearly at depth under Lumibrite lighting, and transitions naturally into everyday wear above the surface. The 41.3mm stainless steel case with Diver's 300M water resistance, screw-down crown, and unidirectional rotating bezel meets the full professional dive watch specification, and the sapphire crystal keeps the dial protected through active daily use.

The stainless steel bracelet is built for durability and all-day comfort, and the 12.5mm slim profile keeps the 41.3mm case wearable without bulk. Hand-winding capability adds practical reliability, and Lumibrite on both hands and hour markers ensures the watch is readable in the low light conditions that diving regularly presents.

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
• Blue dial with baton markers — ocean-connected 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
• 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 SPB483J1 is the Seiko Prospex diver for those who want the 6R55 platform — the same movement that powers the SPB485J1 and the broader Seiko Prospex 300M lineup — in the most universally beloved dive watch colour. Blue dials on dive watches have a heritage that goes back to the earliest professional instruments: the colour of the ocean at the surface, readable at depth, and as natural with a suit as it is with a wetsuit. The 72-hour reserve handles any length of weekend, the Diver's 300M rating means it is genuinely ready for the dive, and the sapphire crystal keeps it looking new through active daily wear.

SPB483J1 vs SPB485J1 — Blue or Black Dial?

Both models share identical specifications — the same 6R55 calibre, 41.3mm case, 12.5mm depth, Diver's 300M water resistance, sapphire crystal, screw-down crown, unidirectional bezel, Lumibrite, date display, and 72-hour power reserve. The difference is entirely in the dial colour. The SPB483J1 has a blue dial — the more ocean-connected, versatile, and classically diver-coded choice. The SPB485J1 has a black dial — the cleaner, more understated, and most widely wearable expression of the same specification. Same 300M diver, two completely different personalities. The choice comes down to blue's heritage association or black's versatility.

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 SPB483J1 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.

Also available in black dial — shop the SPB485J1. Explore the full Seiko Prospex Collection or browse all Seiko watches at City Chain Singapore.