The 56KS series was the only King Seiko line to be produce by Suwa Seikosha rather than Daini Seikosha. Suwa Seikosha and Daini Seikosha were the two segments of Seiko competing against each other in the high-end watch segment. Suwa Seikosha developed and produced Grand Seiko while Daini Seikosha developed and produced King Seiko. The 56KS watches are the only King Seikos to be produced by the Grand Seiko factory. Notice the Suwa typhoon symbol on the dial just below the words "hi-beat." This differs from the thunderbolt symbol that denotes Daini production.

Pre-owned King Seiko Automatic Men's Watch. Reference 5621-7000. Overall, this watch is in (C) Good condition. Watch runs, but does not graph well on a timegrpaher. Needs serviced to run optimally. Roman Numerals on dial. This dial is much less common that the stick index dial. Fantastic case design at the height of Seiko's "Grammar of Design."

- Ref No. : 5621-7000
- Serial No./Year: 972949/1969
- Case:
    35mm diameter, 19mm lug width, 10mm thickness, 41mm Lug-to-lug.
    Stainless Steel 
- Crystal: Plexiglass
- Movement & Accuracy: 
    Caliber: Seiko Cal. 5621 Auto
    Complications: None
    Measured Accuracy: N/A sec/day, needs serviced
    Amplitude: N/A°, needs serviced
    Beat Rate: 28,800 A/h
- Band: Replacement Leather Band
- Condition Rank: C: Good Condition
- Country of Manufacture: Japan

Condition Rank Guide:
-N: Item is in New Old Stock condition (NOS). Shows little to no signs of wear apart from some minor handling wear.
-A: Item is in Excellent condition. Micro-scratches can be seen on the sides of the case, bezel, and/or bracelet. No pitting/gouges on the case or scratches in the crystal.
-B: Item is in Very Good condition. Minor scratches and scuffs can be seen on the sides of the case, bezel, and/or bracelet. No pitting/gouges on the case or deep scratches on the crystal.
-C: Item is in Good condition. Moderate scratches and scuffs can be seen on the sides of the case, bezel, and/or bracelet. Minor pitting/gouges may be visible on the case. One or less deep scratches may be visible on the crystal. See photos.
-D: Item is in Fair condition. Heavy scratches and scuffs can be seen on sides of the case, bezel, and bracelet. Significant pitting or gouges are visible on the sides of the case and the crystal shows multiple deep scratches
-F: Item is in Poor condition. Item is not functional. For parts or repair only.