Today we are offering this 2008 American Eagle Silver Proof Coin featuring the full-length Liberty. The West Point Mint Mark W is on the reverse of this coin. It is packaged in a blue velvet satin-line presentation case and accompanied by the certificate of Authenticity from the United State Mint and the original outer box as received from the mint. Silver Eagle Coin Specifications. Available Mint Marks: S (San Francisco), P (Philadelphia) and W (West Point). Diameter: 1.598 inches (40.6mm). Uncirculated version, 0.117 inch (2.98mm). Proof version, 0.122 inch (3.10mm). Composition: 99.9% Silver. Weight: 1.0000 troy oz. Content: Silver 0.999 troy oz. (31.072g), balance Copper.