Vintage Abstract CORO Brooch Pin Mid Century

Good vintage condition, the clasp works as expected small area of rust on the back of the pin (photo). Mid-Century Abstract Brooch Locking C clasp Measures about at it's longest 2 7/8" by 1 1/2" Stunning Abstract style brooch, silver-tone metal. I can not date this pin with certainty, it was from my mother's costume jewelry collection which dates from the 50's and 60's.