Grand Seiko Introduces the Tentagraph SLGC001
Grand Seiko made a big splash at last year’s Watches & Wonders with the launch of the Kodo Constant-Force Tourbillon, the brand’s first complicated mechanical wristwatch. For 2023, the brand is back with another first-time complication that will likely be one of the most talked-about watches of the show, the Grand Seiko Tentagraph SLGC001. The first purely mechanical Grand Seiko chronograph ever, the Tentagraph is a high-spec sports chronograph that fills a hole in the Grand Seiko portfolio. “Tentagraph” is a portmanteau of the four key features of the watch: TEN beats per second, Three-day power reserve, Automatic winding, and of course, the chronoGRAPH. Initial thoughts The Tentagraph is an important watch for Grand Seiko that enables the brand to stand toe to toe with Rolex, Omega, Zenith, Breitling, and other stalwarts in the popular category of mechanical sports chronograph. Not only is the category a hitherto untapped commercial opportunity for Grand Seiko, it is an opportunity for the brand to demonstrate its technical know-how and ambition. In this context, I would have expected the brand to release an integrated chronograph movement, perhaps based on the 6S movement family. But Grand Seiko has chosen to build a modular chronograph calibre based on the 9SA5, the flagship Grand Seiko automatic movement introduced in 2020, signalling the brand’s commitment to the calibre and its proprietary Dual Impulse Escapement. My colleague Richard Lee notes that the 9S...
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