Saturday watch here, Casio made some great lines of timepieces, but the calculator watches are probably the most recognized, this one is the Casio CFX-400! Capable of normal timekeeping, it was a
Casio CFX-400 white keypad ultra rare model 850$ | WatchUSeek Watch Forums
Casio CFX-400 scientific calculator vintage digital watch chronograph with alarm | #1775176817
Value? Casio CFX-400 Gold original working. | WatchUSeek Watch Forums
Casio Cfx-400 Scientific Calculator Watch Module 463 NOS for sale online | eBay