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Unused - Grand Seiko Chronometer 43999 SD







Grand Seiko was established with a clear objective: to create a wristwatch of unparalleled precision, durability, comfort, and aesthetics, as Seiko articulated. It was not merely a challenge to the Swiss watchmaking elite but a demonstration of Seiko's ability to meet and exceed their rigorous benchmarks. This ambition was realized with the introduction of the inaugural Grand Seiko, the J14070, housing the 3180 movement, in 1960. Despite its outward resemblance to contemporary dress watches, its manually wound 25-jewel movement achieved an impressive accuracy of -3/ +12 seconds per day, meeting Seiko's strict chronometer standards.

Four years later, the 43999 was introduced as a notable successor, boasting a distinctive style that captivated enthusiasts inside and out. This early model of the 57GS series laid the groundwork for Taro Tanaka's influential "Grammar of Design" through its pioneering case architecture and the introduction of Zaratsu polishing techniques. Significantly larger and more commanding than its predecessor, the 43999 also introduced a date complication, marking a significant advancement for Grand Seiko. Its hand-wound Cal. 430 movement, later renamed as the 5722, upheld Seiko's tradition of meeting rigorous chronometer standards.

Among the diverse variants of the Ref.43999, the SD stands out as the pinnacle of desirability. Distinguished by indexes crafted from 14K white gold and meticulously hand-plated using the revered Shokuji technique at Suwa's plant, this variant holds a special allure for collectors. In our pursuit of the extraordinary, we're thrilled to present an immaculate, unused specimen of the iconic SD variant. This pristine timepiece retains its original allure, complete with the coveted blue sticker on the caseback as a testament to its untouched condition straight from the factory. Accompanied by its original straps, buckle, Chronometer tag, box, and instruction manual, this offering deserves a museum exhibition.


This example works flawlessly and will be offered as-is to preserve its original condition. Servicing is possible before delivery, please let us know if you wish to overhaul it.


Shipped from Tokyo, Japan

Unused - Grand Seiko Chronometer 43999 SD

  • This Special is in immaculate condition. The case retains its factory sharp edges with a beautiful Tanaka grammar of design profile. Expect very light scratches on the case due to storage.

    The original silver dial is immaculate. The handset and crown are all original and in pristine condition. The original case back and gold medallion are in immaculate shape with the blue protective film. There are no noticeable scratches on the glass.

    The watch comes with its chronometer tag, original straps, buckle, chronometer booklet, and its original box.

  • BRAND:  Grand Seiko
    MODEL: Second model - Early 57GS
    REFERENCE: Ref.43999
    DIAL: Original silver dial - SD logo
    CASE MATERIAL: Stainless Steel
    CASE DIMENSIONS: 37.0 x 43.0 mm diameter; 10mm thickness, 19mm lug width.
    CRYSTAL: Mineral glass
    CASE BACK: Screw-in Stainless Steel
    MOVEMENT: Hand-wound Cal.430
    Manufacturing date: March 1964
    Service History: Unknown, ±30s/day
    Bracelet/Strap: Original leather straps with the correct Seiko buckle.

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