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
Casio TC-600 Vintage Digital Calculator Watch - YouTube
1995 NOS CASIO VDB-3000 TOUCH SCREEN CALCULATOR WATCH VINTAGE DIGITAL JAPAN | eBay
CASIO AT-550G Touch Screen Analog/Digital Calculator Watch | My Site