Vintage Sterling Silver Coro Clam Signed Coro c sterling silver pin brooch circa 1955 Silver clam shell with 2 silver pearls, cut out design of a crab and 2 fish, approx. 2 5/8 x 1 5/8 inches See Before Cleaning Photos vs Polished Clean Coro Jewelry was founded in New York in 1901/1902 and incorporated in 1913. A factory was established in Providence, Rhode Island in 1911. With offices or plants in New York and Providence, at times they had a presence in Chicago, Los Angeles, San Francisco, Miami, Toronto, England and Mexico as well. Great Britain mechanical patents have been found in the name of Corocraft from 1961 until 1969, which documents actual production in England FREE Shipping! to U.S.A. locations 2-7 Day Shipping via USPS