That Dragon Guy on Twitter: "MOAR VINTAGE STUFF: sure, one can buy a cheap “credit card size” calculator at a dollar store nowadays, but they're always a few millimeters thick. Casio's SL-800
DATAMATH
SL-800 Film Card calculator | 102636433 | Computer History Museum
Casio SL-800WE | Science Museum Group Collection
Casio SL-800 | 102627331 | Computer History Museum
Vintage Casio Film Card SL-750 Solar Cell Calculator - Working | eBay
Is there anything a pre-2000 calculator can do that recent calculators cannot? - Quora
Vintage Made in Japan Casio SL750 Solar Cell Solar Powered - Etsy