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King Seiko Chronometer 45KS 4502-8010






The King Seiko 45KS series holds significant importance for collectors as they impeccably embody Tanaka's Grammar of Design principles. Additionally, these series are profoundly associated with the 1960s Swiss chronometer trials, as their movement directly evolved from the innovations forged during that era-defining competition.


The 45KS movement introduced a new chronometer-grade watch, succeeding the King Seiko 4420-9990. King Seiko chronometers were independently certified by the Japan Chronometer Inspection Institute to meet Swiss standards, requiring precision within -1.0 to +10.0 seconds/day across five positions, denoted as Seiko's 'A' grade accuracy, leading to the 'Officially Certified' mark on dials.


One interesting reference we're excited to offer is this Ref.4502-8010: Also made available in a no-date variation, this reference was exclusively made in stainless steel, boasting a captivating white sunburst dial. While evoking the iconic turtle-shaped design reminiscent of the 7010 case, the 8010 case stands out with its notably thicker profile, particularly noticeable from a side perspective. The lugs are characterized by their short and stout appearance, while the case flanks slope sharply downwards, creating an elegant convex pebble-like contour. Noteworthy are the hands exclusive to the chronometer model, featuring central black stripes reminiscent of the 45KS models, albeit with a sleeker and less sword-like design.


This example includes its original straps, KS buckle, tags, and box, still adorned with its blue protective film on the caseback. Acquiring this particular watch offers a rare opportunity to experience how this reference was originally sold during its release.

The watch will be serviced once purchased. Servicing will take between 1-2 months to be completed before being shipped.


Ships from Tokyo, Japan.

King Seiko Chronometer 45KS 4502-8010

  • Overall, this King Seiko is in immaculate condition. The case is very sharp and has all the factory lines intact. Expect some dirt and some hairline scratches since it's a deadstock.

    The original leather straps are peeling off due to age and will be replaced with a new pair of straps once delivered. The glass has no visible scratches or chips.

    The caseback is beautiful with no visible scratches: The KS medallion is beautiful and most of the original blue protective film still intact.

    The tags,  original box, and outer-box are in good shape.

  • BRAND:  Seiko
    MODEL: King Seiko Chronometer
    REFERENCE: 4502-8010
    DIAL: Original white sunburst dial
    CASE MATERIAL: Stainless Steel
    CASE DIMENSIONS: 41mm height, 37mm width, 10mm thickness, 18mm lug width
    CRYSTAL: Mineral Crystal
    CASE BACK: Screw-down Stainless Steel
    MOVEMENT:  Manual wind Cal.4502A
    Manufacturing date: June 1970
    Service History: Unknown
    Bracelet/Strap: Original black leather straps with signed KS buckle.

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