Unique, rare and hard to find vintage brooch by Coro Costume Jewelry, piece is marked Coro. Coro was begun in 1901 by Emanuel Cohn and Carl Rosenberger who opened a small accessories store on Broadway in New York City. Not until 1943, did the company name Coro, a contraction of the first two letters of each partner’s last name, change to Coro, Inc. Coro company went out of business in 1979.