Before Smartwatches, There was the Gesture-Controlled, Touchscreen Casio AT-552 Janus Calculator Watch from 1984
Believe it or not, Casio’s AT-550 (and its variants, the AT-551 and AT-552) used the  module and were incredibly technologically advanced for their time.
Before smartwatches, there was the gesture-controlled, touchscreen Casio AT-552 Janus. That’s right, the AT Janus models (AT-551 and AT-552) included an eight-digit touchscreen calculator where the entire display could be used to ‘write’ the number or calculator function. The watch would recognize what had been written by the user’s fingertip and perform the calculation.