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Coro jewelry company was named by it founders Emanual Cohn and Gerald Rosenburg in 1901 .From the 1930-50 it was the largest costume jewelry company .It stoped manufacturing jewelry in US in 1979 but still manufactures costume jewelry in Canada.
the coro mark does not have a copyright mark so dates this to prior 1955.
there are in good vintage conditiiion
1 inch in diameter