What this coin looks like (obverse, reverse, mint mark location, special features, etc.): This is the business strike version of the San Francisco minted 1981 S Susan B. Anthony (SBA) Dollar. Typically coins minted in San Francisco during modern times are proof-only coins. Although this coin bears the "S" mintmark and was put into general circulation and can also be found in Brilliant Uncirculated condition in mint sets as well.
Coin valuation chart: Typical coin prices, values and worth per grade or condition - in USD