This is part of a series of Susan B. Anthony dollar coins struck from 1979-1999. Struck in San Francisco and designated as a Business (MS) strike, this coin is made of 75% copper; 25% nickel from a mintage of 109,576,000 struck.
 
Reverse: A flying eagle, clutching olive branches, appears to be landing on the cratered moon, with the earth seen in the background. 13 stars surround the design with the words UNITED STATES OF AMERICA and ONE DOLLAR framing the periphery.
 
Obverse: Portrait of Susan B. Anthony, facing right, surrounded by 13 stars with LIBERTY centered on top, and the date at the bottom. Repunched Mint mark, S, is located off SBA's right shoulder. 
 
It's very rare repunched mint mark, an S over a D and gem proof pristine condition makes this a prized addition to any collection!