Multi-replay function, 2-line display Fraction calculations, Combination and Permutation 9 variable memories, Plastic keys Comes with slide-on hard case International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions. The Casio Story: With the launch of its first watch in November 1974, Casio entered the wristwatch market at a time when the watch industry had just discovered digital technology. As a company with cutting-edge electronic technology developed for pocket calculators, Casio entered this field confident that it could develop timepieces that would lead the market.