Check the listing for details. 2026 Silver Proof Set US Mint Semi Quincentennial Silver Proof Set OGP. Made in United States. Listed at 310.00 USD. The 2026 Silver Proof Set from the US Mint is a special edition collection commemorating the Semi Quincentennial of the United States. This set includes a $10 denomination silver coin with a fineness of 0.999, struck in proof quality at the San Francisco Mint. Each coin is certified by the U.S. Mint, making it a valuable addition to any coin collection. Celebrate this historic milestone with this beautifully crafted and patriotic set of silver coins.