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A calculator watch is a digital watch with a built-in calculator, usually including buttons on the watch face. Calculator watches were first introduced in the 1970s and continue to be produced, despite falling from their peak popularity during the 1980s. The most dominant brands were the Casio Databank series and Timex.
The Casio F-91W is a digital watch manufactured by Japanese electronics company Casio. Introduced in June 1989 [1] as a successor of the F-87W, [2] it is popular for its low price, long battery life and iconic design. [3] As of 2011, annual production of the watch is 3 million units, which makes it the most sold watch in the world. [4]
The Casio CA-53W is a digital calculator watch manufactured by the Japanese electronics company Casio and was introduced in 1988 [1] as a successor to the CA-50. It became famous for its appearance in the American science fiction films Back to the Future Part II (1989) and Back to the Future Part III (1990) [2] and later for appearing in the American TV series Breaking Bad (2008–2013).
Eco-Drive watches use a battery recharged by a solar panel hidden under the watch face. In the rare and discontinued Eco-Drive Duo series, the solar power was supplemented by an automatic quartz power source. One early model, called the Citizen Vitality, used the watch hands to drive a small electric generator, but was discontinued following ...
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