What this coin looks like (obverse, reverse, mint mark location, special features, etc.):
This coin was intended for a 2-coin American Silver Eagle set commemorating the 75th anniversary of the San Francisco Mint. The set contained a 2012-S Proof and Reverse Proof coin - and each set originally sold for $149.95.
Coin valuation chart: Typical coin prices, values and worth per grade or condition - in USD