![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 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](https://i.redd.it/2kiylv521qb61.jpg)
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
Vintage CASIO CFX - 400 watch - Scientific calculator - Collectible - price reduced to $550 | WatchUSeek Watch Forums
![1: From left to right: the abacus ring, a Casio calculator watch and... | Download Scientific Diagram 1: From left to right: the abacus ring, a Casio calculator watch and... | Download Scientific Diagram](https://www.researchgate.net/publication/307467240/figure/fig1/AS:571426333618176@1513250062080/From-left-to-right-the-abacus-ring-a-Casio-calculator-watch-and-the-Apple-Watch.png)