Beveled Mirror with Gazelle

I’ve had this mirror since 1984. It was found in an old shed, behind a pile of wood, on property my family bought in AZ. The backing is wood, and is attached with rivets, so I have never tried to remove it to look for signatures or such. There is some wear in the reflective material at the rivet points, and at the edges. I have NEVER seen another piece like this in the nearly 40 years I’ve had it, and can’t seem to find any info on it. Any help is appreciated!