So far I don't know much about the enlarger. The only distinguishing mark is "Universal Colorhead" written on the front. From what I can tell by searching the web, the model is actually a 23C Series II although I haven't been able to confirm that yet.
The enlarger came with a 50mm Nikon Nikkor lens which will work for 35mm negatives. The enlarger can also be used for 6x6 and 6x9 negatives but I will need a 75mm or 80mm lens to print from those negatives.
I did find a manual for a 23C II - XL on APUG and it looks like it will work with my enlarger.