When I lived in London UK in the mid-sixties the aspiring designer Ossie Clark had just come out with a line of Op Art Fashion. Dresses and jewelry in black and white Optical Illusion designed fabrics.The jewelry at that time was mostly plastic. Emanuel Ungaro showed huge plastic hoop earrings in his line.The Avenger television show featured Diana Rigg in black and white pant suits and helmet hats. This is a fabulous necklace from the decade. The plastic beads are made in two pieces and fit together like a puzzle. The necklace is two strands measuring 21 inches in length. The pressure clasp is marked Made In West Germany. Lovely condition. I will combine shipping on multiple orders.