Casio Men's Pro Trek 50th Anniversary Watch PRW-6900ZE-1JRProduct Highlights The theme is "The spirit of creating something from nothing": Casio's first wristwatch, the "CASIOTRON," born in 1974, was the world's first digital watch to feature an auto calendar function. Since then, Casio has continuously challenged itself in pursuit of originality and innovation, introducing innovations such as solar charging systems, radio wave reception functions, and smartphone linking. Casio's spirit of creating something