Hello all - We have a mystery glass object, a thick, hollow disk, with the center cut out. It is 4.75" in diameter; the slightly off-center hole is 2.25" in diameter; the disk is about 2" deep. One side is flat, and has a rectangular hole through it (1.75" x 1.5"). You can see an image at the link below:
www.flickr.com/photos/64404343@N02/13694786095/<http://www.flickr.com/photos/64404343@N02/13694786095/>
The object was found in a c.1910 dump on Mackinac Island, Michigan.
Any suggestions?
Lynn Evans
Mackinac State Historic Parks