But for a watch as nice as this, that difference is negligible. It’s also, unusually, around £2,000 higher than the Spring Drive equivalent. The Grand Seiko Tentagraph is priced at £12,500, making it one of the most expensive non-precious metal watches in the Grand Seiko stable. Plus, the Tentagraph doesn’t have a GMT function, which over-complicated the display of the other. Iwate pattern, inspired by the contours of the surrounding mountain of Grand Seiko’s Shizukuishi. The blue dial features Grand Seiko’s signature Mt. The layout of the subdials is much nicer with the 30-minute timer, small seconds and 12-hour timer spread evenly across the dial instead of the asymmetrical layout seen on the Spring Drive edition. The name is composed of the first letters of the high beat rate (ten beats per second), its long power reserve (three days), and the automatic chronograph function (automatic chronograph). 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. In comparison to the Evolution 9 Spring Drive Chronograph, I definitely prefer the Tentagraph. Grand Seiko Spring Drive has an accuracy of +/- 1 second per day which is twice as precise as the best Rolex Superlative Chronometer, more precise than a METAS. The calibre, dubbed the 9SC5, is built upon their game changing latest-get hi-beat calibre 9SA5 which notably boasts 80 hours of power reserve, a Grand Seiko overcool hairspring, and a dual-impulse escapement. Iwate pattern with a subtle ridge texture that’s really lovely. As expected from Grand Seiko, the Tentagraph name is very intentional and precise: TEN beats per second, Three days, Automatic chronoGRAPH. At first glance, the dial may appear to have a sunray brushed finish, but it’s actually Grand Seiko’s Mt. The broad ceramic bezel features a black tachymeter, contrasting with the rich blue of the dial and its recessed, tricompax subdials. It has a 43.2mm diameter titanium case with the Evolution 9’s sporty design with angular, facetted lugs.
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