This is a 1946 premium from Post's Corn Toasties. It is made of luminescent plastic which glows brightly in the dark after exposure. This same ring design, a few years earlier in 1940, saw use as the Jack Armstrong Dragon's Eye ring and features figural crocodiles as each band with the animal's jaws spread wide open towards the ring top which supports the oval plastic stone in deep red. A beautiful example essentially Mint. Glows intensely in the dark. Our #205 example with mailer and instructions exceeded $800.