18k Gold Bolt Ring Clasp 0.6cm Diameter Findings Vintage Art Deco c1920.
The gold mark can be found to the side of the clasp as well as the connecting ring see pictures. Good secure clasp with a good spring to open & close.
Diameter of ring 0.6 cm or 0.2 inches.
Total length 1.2 cm or 0.5 inches.
Weight 0.3 grams or 0.1875 penny weight.