Mystery Solved! This is the work of Edward Martin, Springfield, Illinois fused glass artist. He has a web site.
This piece migrated from place to place at the local thrift shop before there was a 50% off art sale, and I picked it up. It is fused glass, about nine pounds worth. It came from the estate of a Bloomington, IL builder who also lived six months of the year in Highland Beach, FL and squeezed in time at a family cabin in Ludington, MI. In addition, he travelled to several countries. Since this piece is not marked in any way, it will be a challenge for me to identify the artist, so hopefully someone will recognize the work of this artist!? No idea of when it was made, either. Sigh. Not a commercial piece, I think, since the hanger and spacers verso are roughly cut Lucite blocks, glued on.