Seiko Prospex SPB513J1 — Speedtimer Automatic Slimmest 6R
The flowing 1972 Panda case shape with super-hard coating, curved sapphire crystal, and 200M water resistance are identical between the two variants. At 39.5mm in diameter and 12.0mm thick, the SPB513J1 wears with the slim, confident presence that makes this the most wearable automatic Speedtimer Seiko has yet produced. Powered by the 6R55 calibre with 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 12.0mm depth — a significant engineering achievement
- Cream dial inspired by the 1972 Seiko Panda case lineage — clean, open, and highly legible
- 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 — 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
Racing watch aesthetics have traditionally favoured dark dials for contrast and legibility, but the cream Speedtimer makes a compelling case for the opposite: the clean, pale surface makes the countdown inner ring and indices read with exceptional clarity in normal lighting, the Lumibrite handles the darkness, and the overall effect is a sports watch that transitions into dress and smart-casual wear without any compromise.
About the 1972 Seiko Panda
The "Panda" is one of the most affectionately nicknamed designs in Seiko's history — a case shape and dial configuration first seen on Seiko models in the early 1970s that became a defining aesthetic of Japanese watchmaking. The flowing case shape with its distinctive curves and proportions has been referenced and reinterpreted by Seiko ever since, and the SPB513J1 brings that case lineage into the Speedtimer Automatic line for the first time — updated with super-hard coating, curved sapphire, and the 6R55 calibre while preserving the proportions 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 heritage since 1969. The SPB513J1 carries that legacy forward as one of only two variants of the first ever 6R automatic Speedtimer — the most technically refined chapter yet in a fifty-year story.
Backed by Seiko's official warranty. Authentic Seiko Prospex Speedtimer watch, sold by authorised retailer City Chain Singapore.
Explore the full Seiko Prospex Collection or browse all Seiko watches at City Chain Singapore.
