The Casio CGW-91 “Cosmo Phase” is a gorgeous piece of digital watch history. The Module 830 features a daily map of the Solar System, accurate from the years 1901 to 2200. The watch tracks the location of the 9 planets (Pluto included), the moon, and Hailey’s Comet. There is Time Mode (12hr & 24hr), Solar System Mode (in which you can view the position of the Cosmos on any day from 1901 to 2200), Hailey’s Comet & Solar Eclipse Modes (in which you can view the dates of Close Approaches of Hailey’s Comet & Solar Eclipses from 1901 to 2200), Multi-Function Alarm Mode, Countdown Alarm Mode, and Stopwatch Mode.

The manual for the Casio Module Number 830 can be seen in the pictures and a copy can be readily accessed for reading or download online.

This watch is in mint condition with a beautiful patina on its bronze case. It is exceedingly difficult to find this model in such condition. The original strap is also included with the watch, and is perhaps even more difficult to find in salvageable condition. The watch comes in a Casio Digital box with a Casio stand which is pictured.

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