Antique Ornamental Silver Tone Metal Screw Back Earrings

These look much older than our grandmother’s other vintage jewelry and not like something that would have been worn by her, so we are guessing they are more antique than vintage. They have no maker's mark and the filigree tested negative for silver using the acid test. They have a patina on the metal filigree beneath the bob on top. 
 
H 7/8” x L 7/8” x D 5/8”
Approx 0.9 oz
 
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