White bead and cubes necklace plastic summer vintage jewelry ll2021

This necklace is made of white plastic, possibly lucite, but definitely not bakelite. The necklace is mostly graduated white round beads with 3 white cubes at the front center. The spacers look like gold washers. The condition is great vintage. The necklace has a plastic barrel clasp. It is 18 inches long. This looks like 1960s style. The necklace has a tiny gold key by the clasp.