You are bidding on a replacement Northern Hemisphere star disc for the Uncle Milton Star Theater Pro Planetarium projector.
This star disc will also fit the Astrotheater by Nashcia, which is the same machine.

Over two years were spent developing these Star Discs. These star discs have almost 1.3 million stars, that's 130 times the number of stars as the original disc! There is just no comparison between the original and this replacement disc
These discs are plotted from a master lithography disk using the same process used for Integrated Circuit fabrication to create breath taking views with incredible nighttime realism far surpassing the original disc. These star discs are so good you can look at them with a pair of low
power opera glasses and still have a good view.

Note: This disc will NOT fit the original Homestar, Homestar pro, or Homestar 2nd Edition.