![Brian Roemmele on X: "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 Brian Roemmele on X: "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](https://pbs.twimg.com/media/ELO6awmUwAAmnvu.jpg)
Brian Roemmele on X: "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 - AT-550 - - Watch - Casio AT550 - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA
![Rare Vtg vintage Casio AT 550 Janus Touchscreen Calculator Watch, Men's Fashion, Watches & Accessories, Watches on Carousell Rare Vtg vintage Casio AT 550 Janus Touchscreen Calculator Watch, Men's Fashion, Watches & Accessories, Watches on Carousell](https://media.karousell.com/media/photos/products/2021/4/14/rare_vtg_vintage_casio_at_550__1618414972_8d925eab_progressive.jpg)