Silver vanity plaque

This is a Vanity plaque that was made by Forbes silve co USA. It has the circle stamp with the eagle in the middle and the word Quadruple is inside the circle as well it has a 215 stamped next to the circle as well as a 16" There are also some markings that where none during the making of the piece that are puzzling. The is a single horizontial line and then two 90 Deg angles nested inside each other and then a box with a smaller one inside it and a smaller one inside of the second one for a total of three boxes. It is silver with 8 legs and a black cardboard backing behind the mirror. The mirror is not beveled but appears to have like a jewel cut around the edge. I'm not sure of the condition of the silver it is in no way shinny and perfect and the glass has scratches but not chipped or broke. I have not been able to find much at all on the internet and nothing of a pattern 215. Thank you any info would be creatly appreciated.

Poor