Original Casio Fx-991ex Advanced Scientific Calculator 552 Functions Engineering Students High School Lab Office Solar - Battery - Calculators - AliExpress
Vintage CASIO fx-19 SCIENTIFIC CALCULATOR in good working order with case | #502349326
Vintage Casio FX-19 Scientific Calculator - Made in Japan with Case Tested Works | eBay
VINTAGE CASIO FX 19 Scientific Calculator and Case $66.86 - PicClick
Casio fx 31. Dad bought this during his college days in 1978. Running flawlessly since 41 years now. I use it sometimes when I'm bored of using my phone. : r/BuyItForLife