Vintage Guglielmo Cini Gold over Sterling Brooch with Celluloid Amber Cabochon

This is a fairly large brooch, 3 1/8" W x 1 3/8" L x 3/8" H.  The design is a double horizontal bouquet of 5 petal flowers with a celluloid (cellulose acetate)  amber cabochon at the center. The sterling was oxidized then gold was added on top to create a beautiful antiqued finish. The signature is stamped on the reverse ~ what appears to be a fleur de Lis then G. CINI STERLING. This is a lovely cast design with the usual fine details of a Cini design. At each side of the cabochon are raised beads and the bezel collar has a lovely foliate pattern. The condition is excellent.