Offered is a 1991-S American Silver Eagle Proof from the San Francisco Mint. This beautiful proof coin contains 1 troy ounce of. 999 fine silver and features the classic Walking Liberty design by Adolph A. The coin has deep mirrored proof fields with frosted details and is housed in a clear protective capsule. 1991-S Proof American Silver Eagle. Original purple American Eagle presentation box. Original Silver American Eagle One Ounce information/specification card. Decorative American Eagle metal emblem/pin associated with the presentation set. The specification card identifies the coin as. Composition: 99.9% Silver. Weight: 1.000 troy oz (31.103 g). The coin itself presents very nicely with attractive proof surfaces. The original presentation box shows very little wear, as shown in the photographs. Please review all photos carefully, as they are part of the description. This is an ungraded/raw coin. No professional grading is being represented or guaranteed.