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My grandpa's 1965(ish) HP 21 Calculator : r/BuyItForLife
Casio FX-991EX Advanced Scientific Calculator, High Resolution Screen, Black - Walmart.com
Buy Casio FX-9860GIII Graphing calculator Black, Silver Display (digits): 21 battery-powered (W x H x D) 91.5 x 21.2 x 184 | Conrad Electronic