Let’s get the boring things out of the equation right now. Because this series of classic watches didn’t need anything more… 5 references in total, all replacing existing models, with small adjustments on the cases, bracelets and dials. Well, this is exactly what Grand Seiko is doing here, by slightly refreshing its 44GS Hi-Beat Collection (time-and-date and GMT). Sometimes, small touches to an existing and emblematic collection are welcome, just to make sure a cornerstone product remains up to date. For that, Grand Seiko this year presented the Tentagraph, its first-ever mechanical chronograph. In other words, not real life conditions and sounds good for marketing.Not all new releases need to be groundbreaking, ultra-innovative, equipped with a new movement or come with an entirely new design. This is the mean (aka average) of the daily rates, before casing, tested in 6 positions in an “artificially controlled” (perfect?) environment for 12 days. You may also see this movement quoted with a mean daily rate of +5/-3 sec/day. Seiko officially claims the accuracy of the caliber 9SC5 has an average daily rate of +8/-1 seconds per day in normal conditions. A three-pointed hammer returns the hands back to zero in perfect synchronization when the chronograph is reset.” – Source Accuracy of the 9SC5: The vertical clutch eliminates any shuddering or jumping of the hands when the chronograph is engaged, and the column wheel offers precise control of the chronograph operation. “Caliber 9SC5 features both a vertical clutch and a column wheel, two hallmarks of a high-quality modern chronograph. A high-beat chronograph that symbolizes the next generation of Grand Seiko watchmaking, the Tentagraph Caliber 9SC5 has 72 hours of power reserve (approximately 3 days) even when the chronograph function is in operation, making it the ten-beat chronograph with the longest power reserve in the industry today.”- Source The Tentagraph’s name describes the characteristics of the Caliber 9SC5 that powers this watch: “TEN beats per second”, “Three days of power reserve”, “Automatic,” and “chronoGRAPH. “In 2023, Grand Seiko’s first mechanical chronograph, the Tentagraph, was born. Some of the topics covered in this caliber listing: 9SC5 introduces a new testing procedure, which now includes an extra three days to assess the watch in three positions while the chronograph is running.” – Source With its energy-efficient architecture, the movement runs for three days even with the chronograph function in operation. This Hi-Beat chronograph movement beats ten times per second, ensuring high accuracy when measuring the time of day as well as elapsed time. “The pursuit of precision is at the heart of the Grand Seiko Tentagraph, which features the new Caliber 9SC5. Building upon the 9S family of mechanical movements, the 9SC5 is the first mechanical chronograph caliber ever produced by Grand Seiko. This caliber is found in the Grand Seiko Tentagraph chronograph which was introduced at Watches and Wonders 2023 on Ma(available for purchase in June 2023). The Grand Seiko caliber 9SC5 (9SC5A) is a hi-beat automatic chronograph watch movement. Automatic, self-winding mechanical, chronographĬentral hours central minutes central chronograph stopwatch seconds small running seconds subdial at 3:00 (60 seconds) 30 minutes chronograph counter at 9:00 12 hour chronograph counter at 6:00 date at 4:30ĭual Impulse Escapement, twin barrels, instant date change (Date Finger mechanism)
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