These vintage screw back rhinestone earrings are marked Czechoslovakia on the back. I'm dating the pair as being from the 1930s.
Coxsackie Antiques Center writes:
The end of World War I created a host of new countries in Europe. Among them, the major importers to the United States were Poland, Hungary, and especially Czechoslovakia. Items with these marks dated between about 1920 and 1939 when WWII began.
Approximately 1" in length and a little over 1/2" at their widest.
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