This is an exceedingly rare vintage Casio AT-550 Janus Fingertrace Calculator Watch and currently the only one on eBay. This is the first true touchscreen watch ever produced. It is a digital-analog watch with the digital part functioning both as a digital watch as well as calculator. The calculator functions are accessed by "writing" on the watch crystal with your finger. This particular example has never been worn and is fully functional. The crystal is scratch free with the original screen protector still  on.It is important to understand that although this particular model was advertised as a touchscreen watch, it WILL NOT function as a modern touchscreen watch or computer does. The screen is not sensitive enough to recognize rapid gestures and if your finger is rather large (like mine) it is a rather frustrating exercise to carry out actual calculations on it. It is rare to find this type watch fully functional; however, and even the best examples will be challenging to operate.