Casio F-91W
Digital watch manufactured by Casio / From Wikipedia, the free encyclopedia
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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 and long battery life.[3] As of 2011, annual production of the watch is 3 million units, which makes it the most sold watch in the world.[4]