RARE vintage 70s TDK magnetic necklace

looks and feels brand new vintage 70s magnetic gold tone necklace with original case and instructions I have the matching bracelet in a separate listing, just search TDK approx 20" long unisex made in Japan, 1978, by TDK magnetic jewelry is believed to help improve circulation, reduce arthritic inflammation, promote relaxation, help with sleep and pain reduction according to the patent, each capsule has enclosed therein one or more pieces of a rare earth- cobalt permanent magnet having the magnetic poles formed on the peripheral surface, the surfaces of the capsule and the chain are made of non-magnetic corrosion-resistant metal. 70s, retro, wellness, health, magnet, vintage, retro, TDK, self care geometric, classic, timeless, basics, everyday, casual, contemporary, modern rare, collectible, gift