take a look at photos comparing the two varieties of mint marks, I think theres one in Red Book and blue book. both are actually "clear" but some retard from 25+ years ago gave them descriptions of filled and clear. the first s, the inexpensive one, is the same style as the s on 1980 proof coins. the second s, the expensive one, is unique to a small minority of 1981 proof coins. dollars and cents are the toughest to get, but all 6 denominations arent common. a proof set with all 6 type ii's is very valuable



















