Vintage Copper Concho and Feather Pierced Earrings

Vintage copper concho and feather pierced post earrings. They are not marked and I don;t know if they are solid copper or copper coated. I don't want to file into them to test them so I am pricing then as if they are coated.  They measure 2 1/4" long. Total weight: 8.5 grams.