This mystery item was found in a c.1910 dump on Mackinac Island, MI.  It is a 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"). 

 
Submitted by Lynn Evans
Mackinac State Historic Parks

 

Please contact the Lynn Evans at EvansL8@michigan.gov with any ideas on the identity/purpose of this object.