Adolph Katz 1945 Coro Sterling Gold Plated Enamel Bird Brooch Vintage Corocraft. Description: Red eye stone, gold plated sterling, enamel made for a duette 3 pieces, but I only possess one of the birds, neither have the clip like seen on the last picture. Marked: Pin clips marked Sterling marked Coro Sterling. Designer Adolph Katz filed Nov 1944, granted Jan 1945. Condition : beautiful vintage piece, some use can be seen on the back and some missing stone also. Would need cleaning (I did not dare washing it) and the enamel have some wear like seen in the picture. Size approx : 1.5" x 1.5" inch.