I bought the Planetarium off the back of an old beat up truck at an auction. I saw it sticking out from under a blanket and asked the guy if it was for sale... I bought it for $165.00 canadian.. which is about 120.00USD.
I figured it was worth maybe 1000.00... much to my surprise, when I got it home and started looking it over it was signed by the maker ~ who was a very famous instrument maker. I was shocked on eBay when it went to 6500.00 almost immediately and stayed there the whole week untill the very last second when it shot up to 9000.00, 10,000.00 and finally 11,300.00.
It looked similar to this... I call it a planetarium, but it really is a Lunarium which shows how the moon revolves around the earth, and the earth in turn to the sun..etc..