2018 Limited Edition Silver Proof Set Black Box & COA 7 Coins and Silver Eagle. This limited edition silver proof set from the United States Mint is a must-have for any coin collector. The set includes mixed denomination coins from the year 2018, all in uncirculated condition and struck with a proof finish. 2018 Kennedy Half Dollar. 2018 5 Quarter Set. 2018 American Silver Eagle. Each coin is composed of 0.9 fineness silver and was minted in San Francisco by the U. The set comes with a box/coa and has been certified by the U. This set is perfect for anyone interested in collecting beautiful and high-quality coins from the United States.