IEEE - When Casio popularized the calculator watch in the 1980's, it revolutionized both fashion and technology for that era and made a huge impact on the wrist tech sector. Now, Apple
Vintage CASIO CFX - 400 watch - Scientific calculator - Collectible - price reduced to $550 | WatchUSeek Watch Forums
![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://preview.redd.it/2kiylv521qb61.jpg?auto=webp&s=c190a2d77266242aa2a141ea86e0b3be035dd167)