This is the Casio CA-500WEBF-1AJR. I purchased it myself from an authorized dealer, so it is 100% authentic. The condition is new and unused. This is a collaboration model between CASIO CLASSIC and the classic movie "Back to the Future," which celebrates its 40th anniversary in 2025. The base model is the CA-500, a long-selling CALCULATOR model from Casio watches that has been around since the 1980s. The face features the DeLorean motif, which symbolizes the work, vividly expressing the world of the movie. Furthermore, the buttons are multi-colored, inspired by the "time circuit," a device used to set the destination time in the DeLorean, giving you a sense of traveling to the future. The back cover is engraved with the "flux capacitor," a device essential for time travel in the movie. The clasp is adorned with the "Back to the Future" logo, paying attention to every detail. The special video tape-style package also reflects the world of the movie. Please refrain from purchasing if you are a nervous person, as this is a personal item. If you have any questions, please ask before purchasing. I will not accept questions after purchase. Returns are not accepted, including for the purpose of preventing product substitution.