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
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Virtual Museum of Calculators
Eddie's Math and Calculator Blog: Review: Casio fx-260 Solar II (fx-82 Solar II)
Vintage casio F-82 watch module 108 made in Japan W case | WatchCharts
Vintage Casio fx-82 scientific calculator | eBay
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Very Rare 1980 Vintage CASIO F-82 (108) Japan W 36mm Watch- needs battery | eBay