Grand Seiko

Spring Drive GMT

Ref. SBGM245

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The Spring Drive GMT showcases Grand Seiko's most distinctive technical achievement: a hybrid movement that combines the mainspring-driven power of a mechanical watch with the accuracy of a quartz regulator, resulting in the smooth, continuous glide of the seconds hand that Spring Drive collectors instantly recognize rather than the traditional tick of a mechanical escapement. At the core is the 9R66 caliber, accurate to within one second per day and delivering a substantial 72-hour power reserve — figures that set it apart from ordinary mechanical or quartz movements alike. A 24-hour GMT hand and rotating bezel add practical second-timezone functionality, while the dial retains Grand Seiko's hallmark finishing, with applied indices individually polished to eliminate any trace of a flat, dull surface. Spring Drive occupies a category of its own in horology, and this GMT model puts that technology to genuinely practical use for frequent travelers. Between the glide-motion seconds hand, the exceptional accuracy, and Grand Seiko's meticulous case and dial work, it's a watch that rewards close attention as much as it serves daily function.