Compelling Vintage Tortolani Copper Shell Brooch

This brooch is pretty unusual and striking. It is typical of Tortolani with its sculpted metal work and nature theme. It has a center of tiny nuggets in the same shade of copper wash as the rest of the brooch. It measures 3" at its longest and 2" at its widest. It is signed Tortolani in script with the copyright mark at the beginning. I have an identical but unsigned brooch in goldplate with a green stone.