The coin in question is a 2008 Sacagawea Dollar, minted at the San Francisco Mint, identified by the mint mark 'S'. This particular piece is part of a special proof series, distinguished by its exquisite finish that enhances the details and provides a mirror-like quality to the surface. Weighing 8.07 grams and measuring 26.5 millimeters in diameter, the coin is made from manganese-brass, a durable alloy that gives it a distinctive golden hue. The total mintage for this proof coin stands at 2,169,561, making it moderately available for collectors. Recognized for its representation of Sacagawea, the Shoshone woman who assisted Lewis and Clark during their expedition, this dollar coin features her portrait on the obverse, symbolizing exploration and the contributions of indigenous women in American history. The reverse showcases an image that highlights the spirit of American achievement. Due to its proof status, this coin holds a higher value among collectors than standard circulation versions, and its limited mintage contributes to its desirability. Overall, the 2008 Sacagawea Dollar (Proof, San Francisco Mint) is a significant piece for numismatists interested in contemporary U.S. coinage and the historical legacy behind it.