Glass revetment plaque fragment
Not on view
Translucent turquoise greenish blue with opaque yellow, making glass look green
Composite mosaic pattern of multiple circular rods, drawn out to give a three-dimensional impression.
Upperside flat; underside flat but slightly uneven.
Probably cut into rectangle and upperside and edges polished in modern times; some deep pitting, dulling and iridescent weathering on underside.