Antique Carved Shell Cameo Filigree Brooch Pin ETC8139

This is an antique carved shell cameo set in a silver filigree brooch. It appears to be 800 silver, but it is not marked. The setting is very unique. The cameo is without damage. The brooch measures 1 1/2" wide x 1 1/4" long. Unsigned.
This is a vintage, previously owned brooch. Therefore, light wear can be expected. There is no visible damage.