SEIKO PROSPEX SPB515J1 SPEEDTIMER AUTOMATIC MEN WATCH

Seiko Prospex SPB515J1 — Speedtimer Automatic Slimmest 6R

The Seiko Prospex SPB515J1 is a landmark Speedtimer — and a landmark for the 6R calibre. This is the first Speedtimer to feature the robust and reliable in-house 6R automatic movement, and at just 12mm depth it is the slimmest 6R model ever produced in Seiko's history. That combination of mechanical heritage and engineering refinement makes the SPB515J1 as significant a watch technically as it is visually — and visually, it is extraordinary: the flowing case shape traces its origins to the famous 1972 Seiko Panda, one of the most celebrated case designs in the brand's history, here brought back with a super-hard coating and curved sapphire crystal for modern durability.

The black dial is encircled by a rotating inner ring countdown timer — a functional reference to the timing instruments of motorsport that frames the dial with purpose and precision. A strong Lumibrite coating on the inner ring's reference triangle ensures the countdown function is readable in both daylight and complete darkness. At 39.5mm in diameter and just 12.0mm thick on the wrist, the SPB515J1 wears with the slim, confident presence of a true racing instrument — compact enough for a shirt cuff, capable enough for 200M water resistance. Powered by the 6R55 calibre with a 72-hour power reserve and hand-winding capability.

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
• First Speedtimer with 6R automatic calibre — a milestone in the Speedtimer line's evolution
• Slimmest ever 6R Seiko model at 11.95mm depth — a significant engineering achievement
• Black dial inspired by the 1972 Seiko Panda — one of the most celebrated case and dial designs in Seiko's history
• Rotating inner ring countdown timer — precise elapsed time reference for racing, diving, and timing use
• Lumibrite on inner ring reference triangle — countdown timer readable in low light and darkness
• Lumibrite on hands and hour markers — superior legibility in all light conditions
• 39.5mm stainless steel case with super-hard coating — refined proportions with exceptional durability
• 12.0mm case thickness — slim, comfortable on-wrist profile
• Curved sapphire crystal — premium scratch resistance and superior optical clarity
• Screw caseback — water integrity and security
• Date display — everyday practicality built in
• Stainless steel bracelet — durable, comfortable, and corrosion-resistant
• Pull-out crown — straightforward time and date setting
• 200M water resistance — built for serious sporting use

Why You'll Love It

The SPB515J1 is a watch that earns its place in a collection for three distinct reasons — and each one is compelling on its own. First, the milestone: the first 6R Speedtimer and the slimmest 6R Seiko ever made at 11.95mm is the kind of engineering achievement that increases a watch's significance over time. Second, the heritage: the 1972 Seiko Panda case shape is one of the most beloved in the brand's history, and its return in super-hard coated stainless steel under curved sapphire is a reinterpretation that honours the original without retreating into nostalgia. Third, the function: the rotating countdown inner ring with Lumibrite reference triangle is a timing tool of genuine utility — readable at night, operable with gloves, precise enough for motorsport and diving alike. The 6R55 with its 72-hour reserve handles any weekend comfortably, the 200M water resistance means it is genuinely capable, and at 39.5mm it wears with a trim authority that 42mm+ watches cannot replicate. A significant Prospex for the serious collector.

About the 1972 Seiko Panda

The "Panda" is one of the most affectionately nicknamed designs in Seiko's history — a black dial with contrasting white sub-registers that created an instantly legible, visually striking chronograph face first seen on Seiko models in the early 1970s. The flowing case shape of those original watches — with its distinctive curves and proportions — became a defining aesthetic of 1970s Japanese watchmaking and has been referenced and reinterpreted by Seiko ever since. The SPB515J1 brings that case lineage forward into the Speedtimer Automatic line for the first time, updated with modern materials and the 6R55 calibre while preserving the proportions and character that made the original so enduring.

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 Speedtimer name has been part of Seiko's motorsport chronograph heritage since 1969, and the SPB515J1 carries that legacy forward as the first automatic 6R Speedtimer — a new chapter in a lineage that began over fifty years ago.

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

Also available in the Speedtimer range: Datsun 240Z limited edition — shop the SSC957P1, solar mint green panda — shop the SSC965P1, and solar white panda — shop the SSC961P1. Explore the full Seiko Prospex Collection or browse all Seiko watches at City Chain Singapore.