vintage Mikasa crystal clear & frosted glass frame or tray

Unmarked (Mikasa?) heavy crystal frame, or tray frame. This has no backing, but latches to hold a back or backing in place. It lays flat, and would make a beautiful glass topped tray!

It measures about 12" x 15" overall, with 7" x 8 1/2" picture area. It's in excellent condition without damage.