Casio AT-550 Touch Screen Calculator Watch (1984)
The AT-550 was an incredible watch for its time, or even for today. It had a capacitive touch screen, and that was used to operate the built-in calculator. How it did so trumps even the fact that a watch released in 1984 had a touch screen, much less at a price of under $100. To enter numbers and the numerical operators, one just “wrote” them with a finger, by tracing the appropriate shape on the watches crystal.
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