Depends on how you want to count them S-73, 74, 75 and 76a are lettered edges. S-76b, 77, and 78 are plain edges S-76 comes both with and without a lettered edge.) S-79 has a reeded edge but I consider it to be a pattern, others don't S-80 is a Jefferson head which was not a mint product Two different edge varieties of NC-1 (NC-1 is a Jefferson Head) then NC-2, NC-3, and NC-4 (NC-4 is a Jefferson head.) So you could have as many as 14 varieties, or as few as 9 if you ignore the pattern and non-mint products, or 8 if you ignore the edge varieties on S-76.
