The product is a rare and valuable collector’s item of 10 solid Troy ounces of sterling silver featuring a design of the Fathers of Liberty. Produced by American Mint in 1975, this American Colonial style piece showcases the Liberty motif. Made in the United States with sterling silver composition of. 925, this unique and historical piece would make a prized addition to any silver collection. Note- for both bullion and coin collectors as well. What a magnificent piece. I only cleaned with water and a couple drops of dawn soap leaving any patina for the next owner to decide to polish out or leave it be. Let me know if you have any questions.