This is an outstanding vintage unsigned Coro duette brooch with two dress clips attached with removable pin back frame. You can wear these as dress clips or as a brooch when put together! Though I can find no signature, Coro made one without the blue stones that is identical in appearance so this must be an unsigned piece from Coro. I'm showing below the Coro version of the brooch without the blue stones. 3 inches at widest and 1.5 inches at highest. A really stunningly gorgeous piece!