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Casio Calculator Watch 1990S . Black black silver silver gold gold white white blue blue red red pink pink gray gray. Casio electronics (zhuhai) co., ltd., a production company for electronic keyboards, established in guangdong, china. Vintage 1980's 1990's Retro Casio Calculator Watch CA53W Old School from www.ebay.com With a solid position in the calculator industry, casio decided to enter the business field of timepieces. The calculator supports addition, substraction, multiplication. The features of the watch were addition, subtraction, multiplication division.