Reference: Brunialti, American Costume Jewelry - Art and Industry (2008) Vol 1 p 99. Designer Adolph Katz, dated 1941. As a pin they measure 2 3/4" wide and 2" tall. Separate as fur clips: they measure 1 1/2" x 1 1/2". They are signed Coro duette with a patent number for the duette mechanism 1798867.
Very good vintage condition: the colors are vibrant: there are tiny spots of enamel loss along the edges from use. The stones have a touch of cloudiness from age; two are missing which gives it a vintage charm. The metal is clean: no plate loss.The mechanism works as does the brooch closure which holds tightly.