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  2. Seiko - Wikipedia

    en.wikipedia.org/wiki/Seiko

    In 1968, Seiko introduced three ten beat (ten ticks per second) calibers, the automatic caliber 61GS, the manual winding 45GS [46] and 19GS [47] for women's watch. The 61GS was Japan's first automatic ten beat watch, and it was the most accurate mechanical watch due to the high beat calibers. [ 48 ]

  3. Chronograph - Wikipedia

    en.wikipedia.org/wiki/Chronograph

    The term chronograph comes from the Greek χρονογράφος (khronográphos 'time recording'), from χρόνος (khrónos 'time') and γράφω (gráphō 'to write'). '). Early versions of the chronograph are the only ones that actually used any "writing": marking the dial with a small pen attached to the index so that the length of the pen mark would indicate how much time had

  4. Astron (wristwatch) - Wikipedia

    en.wikipedia.org/wiki/Astron_(wristwatch)

    The Astron was unveiled in Tokyo on December 25, 1969, after ten years of research and development at Suwa Seikosha (currently named Seiko Epson), a manufacturing company of Seiko Group. Within one week 100 gold watches had been sold, at a retail price of 450,000 yen ( US$1,250 (equivalent to $10,386 in 2023)) each (at the time, equivalent to ...

  5. History of watches - Wikipedia

    en.wikipedia.org/wiki/History_of_watches

    Some Bulova models featuring the movement have a smooth sweeping second hand rather than one that 'ticks' second-to-second. [47] In 2019, Citizen Watch advanced the accuracy of a quartz watch to +/- 1 second a year. [48] The improved accuracy was achieved by using an AT-cut crystal which oscillates at 8.4 MHz (8,388,608 Hz). The watch maintains ...

  6. Automatic quartz - Wikipedia

    en.wikipedia.org/wiki/Automatic_quartz

    As of 2007, Seiko has sold more than eight million automatic quartz watches. [2] The different calibres of Kinetic watches currently are relatively large and heavy, weighing in at 1/3 of a pound (150 grams) or more on many models. Therefore, most Seiko Kinetic watches are only available in a men's size. Movement calibers: 1M20; 3M21 3M22 ...

  7. Pulsar (watch) - Wikipedia

    en.wikipedia.org/wiki/Pulsar_(watch)

    Pulsar P4 Time Computer with LED display ref. 3215-2 mens stainless steel watch circa 1975 Made in the USA A Pulsar LED watch from 1976. In 1970, Pulsar was a brand of the American Hamilton Watch Company which first announced that it was making and bringing the LED watch to market. It was developed jointly by American companies Hamilton and ...

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