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
Casio AT-550 Module 320 Janus Sensor Touch Calculator Vintage Watch For Parts | eBay
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Vintage Casio 320 AT-550 Watch | eBay
Casio AT-550 Janus Touchscreen Calculator Watch from 1983! | eBay
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
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