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Grand Seiko 56GS 5646-5010 Kira-Zuri







When it comes to rare and unusual vintage Grand Seiko models, the Ref. 5646-5010 undoubtedly stands out. Featured exclusively in the 1973 catalog, the Ref. 5646-5010 likely wasn't among the most successful lines of vintage Grand Seikos. This limited production period helps explain why it has become such a rare reference to come across today.


The dial features a gradient of yellow, white, and brown, known as the "Kira-Zuri" texture. This distinctive and mesmerizing finish is unique to this reference and has also been showcased in recent Grand Seiko models, such as the US 2018 Limited Edition Grand Seiko (SBGA387, SBGA385, and SBGA384).


The Ref.5646-5010 stands out with its unique square case, distinct from the rest of the vintage Grand Seiko collection as it diverges from the Grammar of Design (G.O.D.) principles. While its unconventional design might seem surprising at first, the intricate details will soon captivate you. The contrast between the brushed and polished sides of the C-shaped case, particularly on the edges of the lugs, is stunning especially when it plays in the light.


This 56GS model is truly sublime, retaining its original look with the correct GS buckle, black Seiko alligator straps identical to the originals, and the original box. And with this set, we hope it offers an authentic unboxing experience reminiscent of when it was first sold.


Shipped from Tokyo, Japan

Grand Seiko 56GS 5646-5010 Kira-Zuri

  • This 56GS is in immaculate condition. The case retains its factory-sharp edges with no visible bumps. Expect very light scratches on the case due to storage.

    The dial is immaculate with no blemishes or deterioration observed. The handset and crown are all original and in pristine condition. The original case back is immaculate with some light scratches due to storage. There are no noticeable scratches on the glass.

    The watch is paired with a set of black crocodile straps, its original GS buckle,  and its original box.

  • BRAND:  Grand Seiko
    MODEL: 56GS
    REFERENCE: Ref.5646-5010
    DIAL: Original Kira-Zuri dial
    CASE MATERIAL: Stainless steel
    CASE DIMENSIONS: 35.0 x 41.0 mm diameter; 10.5mm thickness, 19mm lug width.
    CRYSTAL: Mineral glass
    CASE BACK: Snap-in Stainless Steel
    MOVEMENT: Cal.5646A
    Manufacturing date: July 1972
    Service History: Unknown +3s/day
    Bracelet/Strap: Black crocodile leather straps with the correct GS buckle.

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