tough one
sure its glass?
You may be right, but why the gold glitter on the back? That doesn’t look natural to me.
It sure looks like natural fracturing in that piece to me, when the first pic is enlagred. I can see the 2 small square on either side in the center of the depressed area. That piece would have been glued on to whatever it was affixed to from the looks of it. Along the lines of what the jewelerguy originally stated in reply number 7. I have never seen anything quite like it. Beautiful little piece that would go in my dislay cabinet for sure, be it mine.
Agree, my first thought also. My folks used clear glass ones thru the 1950s or so, have seen other colors.Coaster to place under couch to not snag carpet when moving to sweep underneath. Well thats what my grandmother used them for, and the bottom edges are smoothed to help it slide easier.