Vtg Round Brass Mirror Bronces Artistico Espana. This measures 15.5" but it measures 16.5 by the 2 attachment points. On each side there is a tube that comes out and has threads in it. So this is made to attach to a frame. Please see the last 2 pictures. This is what it looks like with the matching frame. The glass does have a few spots I couldn't get to come clean. It's hard to show in the pictures but I tried to capture it. The marking on the back is very interesting and I can't find much info on this piece. Please see all pictures.