The 1986 Ellis Island Silver Proof Set is a collection of US 90% silver coins minted by the U.S. Mint. This set includes coins struck in proof condition, with a fineness of 0.900 silver. Uncertified and ungraded, this set is a valuable addition for collectors or those interested in silver bullion coins. The year 1986 holds historical significance as the last year the US Mint produced coins with 90% silver content, making this set a unique and sought-after piece for numismatists.