Vintage 1977 Silver Jubilee Enamel Sterling Crown Pendant Necklace cheapest on Chain Commemorative Queen Elizabeth II

A large commemorative Crown coin from the Queen's Silver Jubilee in 1977. Fully enamelled, monochrome to one side, and handpainted in colour the other. With a silver mount and silver chain (both cheapest tested), but unmarked as silver - could be sterling, but may be a slightly lower grade. I am not sure whether the coin itself is a solid silver proof version or not.

All in a very good condition with little signs of use - silver chain measuring approximately 23" long