Signed Vintage Taxco Silver and Abalone Screw Back Earrings Eagle Mark w 3

These vintage earrings are very well made and very well marked. These are marked with an eagle with the number 3 in the center indicating it was made between 1948-1980. They are screw backs indicating they are earlier. I have been unsuccessful in identifying the maker's hallmark. These are quite old and marked very well. See photos.