Brass finished angle iron frame shelf with a double pane, smoked glass shelf that rests inside the frame. The thinner pane is glass, the thicker one is plexiglass. I never saw it installed, but I'd guess it was installed between two posts or walls since the 9" deep ends are the only places with holes to mount it. Could make a great room divider or plant shelf. Photo is representational.  Item may have cosmetic damage. This one has a piece of matching angle iron hanging off the front edge, hence height difference.