Silver Proof Set in Capitol Plastics Holder (5 Coin Set). Enhance your coin collection with this amazing 1942 U. Silver Proof Set in Capitol Plastics Holder. This set includes 5 coins that are in pristine condition, making them a valuable addition to any collection. This set was minted in Philadelphia, United States. The strike type of the coins is proof, adding more value to the set. The set is not certified; however, the Proof coins speak for themselves. Don’t miss this opportunity to add a piece of history to your collection.