The 2021-S Limited Edition. 999% Pure Silver 6-Coin Proof Set includes six American Eagle coins minted by the U. Each coin contains 1 oz of. 999 fine silver, making it a valuable addition to any collection. This set comes in a box with Certificate of Authenticity, ensuring its authenticity and quality. The coins are strike type proof, showcasing the intricate design of the American Eagle in a high-quality finish. This limited edition set is a must-have for any coin enthusiast or collector looking to add rare and exquisite pieces to their collection.