Black crystal faceted 50’s Silver Drop clip on Earrings

Patent number 156452 refers to a design patent for an "ear clip finding" filed in 1949 by Frederick W. Moulson and assigned to B. A. Ballou & Co. Incorporated. This patent number is often found on vintage clip-on earrings from the 1950s and 1960s, including pieces by designers like Elsa Schiaparelli. The patent number indicates the type of ear clip mechanism used on the earrings, rather than the design of the entire earring itself.