- koimaster (Online)
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So audacious was Seiko’s aspiration, that they were printing the words, “chronometer” on their dials in reference to its watches’ excellent accuracy. The Swiss, however, did not take too well to this. European Chronometer Official Association, as a matter of fact, reached out to Seiko in this regard insisting that Seiko remove the word from its King Seiko watches manufactured at the Daini factory and its Grand Seiko watches made in the Suwa factory.
Seiko’s response to this will forever be the stuff of legends. Rather than a note in return, or something to that effect, Seiko took it upon itself to send several mechanical wristwatch movements to the 1964 Neuchâtel Observatory trials, which were at the time the most demanding chronometric competition in the world. The Trials required that movements should not deviate more than +/− 0.75 seconds a day with +/− 0.20 seconds for temperature variations. Movements were submitted to relentless scrutiny for 45 days straight.
https://www.revolution.watch/introducin ... seiko-ksk/
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