Dating jewelry clasp
Sometime around the turn of the 20th century, the locking C clasp was invented.
These clasps have a spinning locking mechanism that hold the brooch securely in place.
However, if there are no markings on a piece, then we must turn to other methods of dating.Unfortunately, you can’t always date a vintage necklace by its clasp alone.You have to take a few other factors into consideration, as well.Vintage jewelry findings of the 50s, including safety catches, pin stems and joints, ear wires and nuts. Exclusively Wholesale, 1950 Vintage jewelry findings including guard chains and ring guards.Pin stems, screw-back earrings findings, safety and plain catches. Dual ring guards, child's ring chains, earrings guards, safety chains, cord bracelet guard chains, Benj. Exclusively Wholesale, 1950 shown here was patented in about 1894, though these earrings originally had a different style back for pierced ears.
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Early locking C clasps opened downwards, and more modern ones open upwards. It was widely used for jewelry designs in 1910 and remains popular today.