Silver This is a rare and valuable 1992-93-94-98 Silver Proof Set from the U. Each set includes 1-1C, 1-5C, 1-10C, 1-25C, and 1-50C coin. The coins are made of silver, copper-nickel, copper-plated zinc, and have a proof strike type. The set comes in its original government packaging with an OGP COA. The coins are uncirculated and have a grade of proof. The mint location is San Francisco, and the set was manufactured in the United States. It is a must-have for any coin collector or enthusiast.