Here are two pair of very cool pair of screw back earrings, One pair is from Los Castillo with the 1948-1955 circle mark in the shape of a teardrop, approx weight 15.34g. The round disc earrings are marked on the back Hecho Mexico 900 and what I believe to read DF.SWK. These large dangle earrings weigh approx 22.6g with the dangle being 1 7/8" across. Has slight grenning/ verdgres on one of the smaller earrings.