The SBA (Susan B. Anthony) dollar was introduced by the United States Mint in 1979 and produced until 1981, with a final issuance in 1999 for collectors. The coin features an image of Susan B. Anthony, a prominent women's rights activist, on the obverse, and an eagle landing on the Moon, symbolizing the space program, on the reverse. It was the first depiction of a real woman on U.S. coinage, and while intended to replace the silver dollar, it faced public scrutiny due to its similarity in size and weight to the quarter, leading to limited circulation and collector interest.