Coro's Pearl Earrings c. 1950's

Pair of Coro pearl earrings with screwback closure. I believe this piece is much older than the 1950's due to the mark being non-scripted. All of the coro markings post 1950's are in script / cursive. The closest mark I saw of Coro's that is close to the one on the back of this piece is from 1919. (Source: Costume Jewelry Collectors International)

Please note the signs of oxidation at the back of the earrings. This pair of earrings are used fairly, as is consistent with age. Purchased from a collector in Ontario.

Measurements:
Diameter of smaller pearl: 4mm
Diameter of bigger pearl: 6mm
Total length: 1.5 cm

Materials:
Gold tone on metal (Brass, copper, bronze)
Faux Pearls