This beautiful vintage duette is marked Coro Duette with a patent number for the frame of 1798867. The design patent for the clips is 151259. This duette was made by Adolph Katz and has aqua rhinestones at the end of each Bow. This duette is from 1948 and is shown in several books. It measures 2-1/4" x 1" and is in excellent condition. It was called Harlequin.
Collecting Costume Jewelry 101 - The basics of starting, building and upgrading - Second Edition - By Julia C. Carroll
Collecting Costume Jewelry 202 - The basics of Dating Jewelry - 1935 - 1980 - Second Edition - Julia C. Carroll
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