Vintage deco I Michelson 1/20th gf flower pin with rhinestones

This an elegant I. Michelson signed Art Deco 1/20 12K gold filled flower and leaf swirl brooch. This brooch features a five petal flower with a clear rhinestone center, a dimensional leaf with a lower cluster of 3 blue rhinestones on the lower tendril.Stones are prong set. It is signed in a cartouche on the back - an M superimposed on a C, and the words 1/20 12K GOLD FILLED - which is an early mark. The company was in NY, NY and was in business from 1884 until 1931. It measures 2 3/4” x 1 1/2” and the pinback is straight and works smoothly and securely.