Here is a lovely, Katz era, Coro Duet clip brooch. It is two rhinestone studded, flower shaped clips on a signed Coro Duette frame with patent number 1798867. One of the pins is signed Corocraft Des. Pat. Pend. The closest patent I could find to match the design is Katz patent number 148877 from 1948. Together it measures 2.5" across x 1.5" tall. There are no missing stones but some have yellowed.