This ground-breaking mini dollar coin was intended to save the U.S. Mint production costs over the big Eisenhower dollar. But the nation's first small dollar series didn't gain wide public acceptance in commerce when it was issued from 1979-1981. The principal reason was that the coin closely resembled the quarter in color and size. And U.S. dollar bills were not phased out when the SBA dollar was introduced. In 1999 these additional coins were minted to meet the needs of vending machines.