Seiko 8M15A - Technical Guide
The Seiko 8M15A is a purpose-built quartz chronograph movement designed specifically for sailing and regatta races. Introduced in the early 2000s, this movement combines a 5- or 10-minute countdown timer, standard timekeeping, and audible signal indicators tailored for yachting competitions. It’s commonly found in Seiko Sportura and Prospex Marinemaster Yacht Timer models.
The 8M15A stands out for its unique regatta timer disc display, intuitive pusher controls, and beep alerts at every minute during countdown mode — critical for pre-race maneuvering.
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