The 1979-S Susan B. Anthony Dollar is very common in circulated grades and up to MS65 condition. Only MS66 examples and higher are scarce. In MS66 there are probably a couple thousands examples that survive. In MS67 much fewer examples exist, probably more like 400 examples survive in this condition. In MS68 they are truly scarce with less than a handful of examples known to exist and none surviving in any higher condition.