https://www.offthecuffdesigns.com/product/shell-cameo-pin-pendant-1930-s-carved-shell-head-of-woman-gf/60
Delicate is this GF shell cameo pin, measuring 1" X 1.15" rectangular . High relief, head of woman, circa 1930's, Mark of maker P. S. Co.$4.00 mailing cost.
shell cameopinpendantcarvedhead
https://www.rhs.org.uk/plants/266659/iris-shell-cameo/details
Find help & information on Iris 'Shell Cameo' from the RHS
shell cameoirisrhs