This is one of the most visually distinctive and collectible vintage Seiko sports watches ever made. You're looking at a Seiko Super Runners, model S640-4000, serial 6N0017 — the bold, oversized racing-inspired digital sports watch that Seiko produced as their flagship marathon and running instrument. The black, gold, green, and red colorway is immediately striking and unmistakable, with the green SELECT and LIGHT buttons flanking the case and the iconic green START/STOP and red LAP/RESET buttons dominating the lower face. This is a watch that turns heads even today.

The strap is embossed "LAP 120 MEMORY / SUPER RUNNERS" on the upper band and "SEIKO / WATER RESIST 10BAR" on the lower — a full billboard of credentials on the wrist. The case back confirms: SEIKO, WATER RESISTANT 10BAR, PLASTICS, ST. STEEL BACK, S640-4000, serial 6N0017.

The dial features a large, wide LCD display showing day, date, and time with seconds, plus a distinctive horizontal bar graph display across the mid-dial — a hallmark of the Super Runners racing aesthetic. Function modes displayed below include TIME, CHRONO, RECALL, ALARM, and CH. Button labels around the bezel read ADJUST, SELECT, MODE, LIGHT, START/STOP, and LAP/RESET. The watch is running and fully functional in the photos with a clear, legible display.

The strap fits approximately a 7" wrist as shown on the bracelet sizing cone. Please note that this watch has a replacement keeper on the strap — the original keeper is not included. The strap and case show honest vintage wear including scratches on the case back consistent with age and use. The LCD and all buttons are fully functional.

This is a grail piece for the Seiko collector or anyone who appreciates the golden era of Japanese sports watch engineering. These don't come up often in working condition.

Shipping is same day or next day. Packed securely with full tracking.

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