Rare Vintage Casio C-80 Men’s Digital Calculator Watch JDM 1980s Module 133

Up for sale is an extremely rare vintage Casio C-80 men’s digital calculator watch, produced for the Japan Domestic Market (JDM) in the 1980s and powered by Module 133. This early Casio calculator model is one of the brand’s most iconic designs, combining practical computing functionality with classic square digital styling. The watch is in full working condition and all standard features and functions operate properly, including timekeeping and alarm functions. In calculator mode, the watch has a small quirk where the first digit appears visually as an “8” instead of a “0.” Although it looks like an eight on the display, it is actually functioning as a zero and appears to be a screen display quirk rather than an actual calculator error. Additionally, the first button press when entering numbers does not always register immediately. With a bit of patience, the calculator functions properly. This behavior occurs each time the calculator function is accessed, and the exact cause is unknown. All parts of the watch are original. The watch is fitted on a genuine gold-toned Casio bracelet, though it is unclear whether the bracelet is original to the watch. This example comes with its original Casio box, which is included with the watch. The watch is in excellent physical condition with only minor signs of use and age. The photos best describe its physical condition and should be reviewed carefully prior to purchase. This example is offered in an extremely rare brown resin case colorway, a variation that is seldom seen and almost never appears publicly for sale. Brown-case C-80 models are considered among the hardest-to-find variants and are highly sought after by serious Casio collectors. Key Details • Brand: Casio • Model: C-80 • Module: 133 • Era: 1980s • Market: Japan Domestic Market (JDM) • Movement: Digital Quartz • Functions: Calculator, Time, Alarm • Case Material: Plastic/Resin (rare brown colorway) • Bracelet: Genuine gold-toned Casio bracelet • Included: Original Casio box A standout and highly collectible Casio calculator watch, ideal for collectors of rare JDM Casio digitals and early calculator models. Ships carefully. Feel free to message me with any questions.