Rare Vintage Casio AT-550 Janus Ana-Digi Touchscreen Calculator Watch JDM 1980s

Up for sale is an extremely rare vintage Casio AT-550 “Janus” men’s analog-digital touchscreen calculator watch from the Japan Domestic Market (JDM), dating to the early 1980s and powered by Module 320. This remarkable model is widely regarded as one of the earliest touchscreen watches ever produced and represents one of Casio’s most experimental and technologically ambitious designs of the era. The AT-550 features a unique hybrid “Janus” layout combining traditional analog hands with a digital LCD display. What makes this watch truly extraordinary is its pioneering touch-sensitive crystal, which allows the wearer to operate the calculator by tracing numbers and mathematical symbols directly onto the watch glass with their fingertip. Casio referred to this technology as a finger-trace recognition system, an early gesture-recognition interface decades before touchscreens became common on phones and smart devices. Unlike conventional calculator watches that rely on physical buttons, the AT-550’s transparent sensor layer is built into the crystal itself. The watch interprets the shape of numbers or symbols drawn on the surface and converts them into calculator inputs displayed on the LCD screen. This early implementation of touchscreen technology is relatively crude compared to modern capacitive displays, but it remains one of the most fascinating innovations ever produced in vintage watchmaking. The watch is being sold for parts and repair as the digital portion of the watch is not functioning. However, the quartz analog portion of the watch is working properly and the watch is currently holding accurate time. Due to the digital display not functioning, I am unable to test or confirm whether the touchscreen calculator system is operational. All parts of the watch head are original, and the watch is fitted on an aftermarket stainless steel strap. The watch is in good physical condition overall, but has signs of use and age. The photos best describe its overall physical condition and should be reviewed carefully by interested buyers. Examples of the AT-550 rarely appear on the market due to their rarity and historical significance, representing an important milestone in the history of wearable electronics and early touchscreen technology. Key Details: • Brand: Casio • Model: AT-550 Janus • Module: 320 • Era: 1980s • Origin: Japan Domestic Market (JDM) • Display: Analog hands with digital LCD • Special Feature: Finger-trace touchscreen calculator interface • Case Material: Stainless steel • Strap: Aftermarket stainless steel strap • Condition: Being sold for parts and repair due to non-functioning digital display; analog quartz portion working A rare opportunity to own one of Casio’s most innovative and historically significant watches from the early digital era. Ships carefully. Feel free to message me with any questions.