lamp shade question
I have never posted in this forum before. I post on garden junk and someone there suggested I ask here. I was putting together this mushroom that I planned on putting in my garden and was told there may be too much value in this shade to do that. I purchased it at a garage sale and threw away all the actual lamp parts because I only planned to use the shade. It is 21 inches in diameter and was a hanging lamp. No markings of any kind on shade as to who made it. I have in the past few days been offered $100.00 for the shade and am wondering if anyone in this forum has any input to help me know what I've got and if indeed that price is reasonable.
All suggestions will be greatly appreciated. Double clicking the pic will enlarge it