国立アメリカ歴史博物館のインスタグラム(amhistorymuseum) - 3月10日 02時59分

Pulsar Electronic Wristwatch, 1972. Marketed as "a time computer," the watch cost about as much as a small car at the time.
The display was composed of LEDs that consumed so much power that the watch couldn't display the time continuously. Instead, the wearer had to push a button to illuminate the time.
The new quartz technology inside made the watch accurate to within a minute a year, compared to about 15 seconds a day for the best mechanical watch.
⌚️?#watches #wrists #history

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