The Fantastic Beasts Magical Congress 2017 1 Troy oz. 999 Silver Proof Coin is a highly collectible and valuable coin issued by the Cook Islands. This coin features a unique design related to the magical world of Harry Potter, making it a sought-after piece for fans and collectors alike. With a composition of. 999 fine silver and a total precious metal content of 1 oz, this coin holds both extrinsic and intrinsic value for those interested in numismatics and precious metals.