CASIO FX 4500P DOT MATRIX LCD Scientific Program Function Calculator [Japan] 4971850145417 | eBay
hangyodon1123 on Twitter: "Casio fx-4500P There are thin protrusions on both sides of the [AC](ON) key. The power does not turn on without permission. https://t.co/306HCLPNHh" / Twitter
Vintage Casio FX-4500P Scientific Formula Calculator very good | eBay