This is a rare and valuable 1961 Proof Set from the US Mint, featuring 90% silver coins. The set comes in its original envelope with a Certificate of Authenticity, and is classified as "Uncirculated" with a "Proof" strike type. The coins were minted in Philadelphia, United States, and are a testament to the country's rich history and numismatic culture. The set is a must-have for any serious coin collector, and is sure to be a prized possession for years to come.