HP-01 Digital Wristwatch Calculator

The Hewlett-Packard HP-01 is the only calculator wristwatch ever manufactured and sold to the public by Hewlett-Packard. The HP-01 used light-emitting diodes (LEDs) for its digital display. Introduced in 1977 at the height of the LED watch craze, five models were available, two gold filled models and three stainless models. Prices were from $650 to $850 which was quite a lot of money back in 1977

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