The Susan B. Anthony Dollar was minted from 1979 to 1981 and again for one more year in 1999. Designed by Frank Gasparro, the obverse features women’s suffrage campaigner, Susan B. Anthony. The reverse depicts an eagle over the surface of the moon, similar the the Eisenhower dollar.
Although the coin is round, the Susan B. Anthony dollar may appear to be an 11 sided hendecagon due to the 11 sided rim bordering the edge of both sides. Unfortunately the design of the Susan B. Anthony Dollar was found to be easily mistaken for the quarter because of its similar size and color.
Three mints struck these coins, the Philadelphia (P), Denver (D), and San Francisco (S). These mintmarks can be found on the obverse of the coin, towards the bottom left of the portrait.