Brian Roemmele on Twitter: "It was 1982 and the Casio's AT-550 was the first consumer hand recognition device and first consumer touch screen device, built into a calculator watch with an analog
My TC-50 bought in 1985. Touch screen calculator watch. Dirty, needs a band. Do they still make batteries for it. Is it worth spending money on it. Thanks. : r/casio
VINTAGE CASIO TOUCH SCREEN TC-500 CALCULATOR CHRONOGRAPH DIGITAL WATCH CIRCA '83 | WatchCharts
Casio HOTBIZ Touch Screen Quartz Vdb-3100 Vintage Men's Wl17827 for sale online | eBay