The rim is not dentilled but instead consists of angular segments that frame an eleven-sided polygon.    From Wordnik.com.  [Susan B. Anthony Dollar, 1979-1999 : Coin Guide] Reference

The eleven-sided rim is repeated, framing a left-facing eagle with wings spread as if landing on the surface of the moon pictured on the bottom third of the coin.    From Wordnik.com.  [Susan B. Anthony Dollar, 1979-1999 : Coin Guide] Reference