Casio FX82 calculator I bought in 1982 at the age of 15. Used it throughout school, my apprenticeship and work as a draughtsman. Don't use it much now but it still works
Casio FX-82 Scientific Calculator Solar Electronic Fraction with Cover | eBay
Casio - fx-82 Super Fraction - - Scientific calculator - Casio fx82 Super Fraction - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA
fx-82ES PLUS WE | SCHOOL & LAB. | Calculators | CASIO
File:Casio-fx-82es.jpg - Wikimedia Commons
fx-82MS-BU | SCHOOL & LAB. | Calculators | CASIO
Casio fx-82MS Repair - iFixit
fx-82ESPLUS | Non programmable | scientific calculator | CASIO