The King Seiko line began as a hand-wound series but evolved over time into a remarkable automatic lineup born from the friendly rivalry with Suwa’s Grand Seiko.
This example, the Ref.5625-7120, features a clean, understated Gray-blue linen dial with crisp applied indices. While the reference was also offered with a white dial, there’s no denying this variant is the most charming. What’s especially interesting, well-documented if you research this reference, is how the dial naturally fades to a charcoal tone over time, much like its Grand Seiko sister, the Ref. 564X-8000.
The case design is distinct to this model, with sharp, architectural lugs and flat Zaratsu-style planes that embody Seiko’s classic Grammar of Design. A slim profile and narrow polished bezel frame the dial beautifully, while the recessed crown keeps the silhouette clean and symmetrical.
This is the first time we’ve ever encountered a true new old stock example, complete with its original strap, signed buckle, and original price tag. You simply won’t find a better one.
The watch will be serviced once purchased. Please allow 1-2 months for servicing to be completed.
Ships from Tokyo, Japan.
King Seiko 56KS 5625-7120 Gray-blue dial
Overall, this 56KS is in immaculate condition.
The case is factory sharp with a few light storage scratches.
The original dark gray dial is immaculate, and the handset is overall beautiful. There are no scratches on the glass.
The original case back is sharp with a few storage scratches, and the medallion is beautiful.
BRAND: King Seiko
MODEL: 56KS Chronometer
REFERENCE: 5625-7120
DIAL: Original dark blue linen dial
CASE MATERIAL: Stainless Steel
CASE DIMENSIONS: 36mm wide (excluding crown), 42mm tall, 10mm thick
CRYSTAL: Mineral Crystal
CASE BACK: Monocoque Stainless Steel
MOVEMENT: Cal.5625B
Manufacturing date: March 1972
Service History: Unknown, ±5s/day
Bracelet/Strap: Original Seiko black leather straps with signed KS buckle.

