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Grand Seiko Chronometer 43999 AD







In 1964, the Grand Seiko Ref.43999 model or simply GS2 emerged as a distinguished successor, captivating enthusiasts with its unique design both inside and out. This early model of the 57GS series paved the way for Taro Tanaka’s influential “Grammar of Design” through its innovative case architecture and the introduction of Zaratsu polishing techniques. Larger and more commanding than its predecessor, the 43999 also featured a date complication, marking a significant advancement for Grand Seiko. Its hand-wound Cal. 430 movement, later renamed the 5722, maintained Seiko’s tradition of stringent chronometer standards.


The Ref. 43999 came in various dial variants and the example we are offering features a 3-pointed star inside a triangle, signifying an Applique Dial (AD). This indicates that the indexes are Rhodium plated and crafted using the esteemed Shokuji technique at Suwa’s plant.


This set includes a pristine AD example, complete with its original tags, buckle, and box, making it a perfect addition to your collection if you've been considering this iconic reference.


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

Grand Seiko Chronometer 43999 AD

  • This AD watch is in immaculate condition. The case has light scratches but retains its factory sharp edges, showcasing the beautiful Tanaka grammar of design profile.

    The original silver dial is flawless, with only microscopic freckles that are unnoticeable to the naked eye. The handset and crown are all original and in pristine condition. The case back has some tool marks but retains all the engravings. The medallion shows light signs of tarnishing but is overall in beautiful condition.

    The watch comes with its chronometer and price tags, new Seiko straps paired with its original buckle, and its original box.

  • BRAND:  Grand Seiko
    MODEL: Second model - Early 57GS
    REFERENCE: Ref.43999
    DIAL: Original silver dial - AD 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: January 1964
    Service History: Unknown, ±10s/day
    Bracelet/Strap: Seiko DA53 Black Alligator straps with the correct Seiko buckle.

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