Here is a checklist to help you Tony, I don't get into detail w/ all the E121-like potential backs on it but this is a fairly complete checklist for Mays...
Mays, Carl W.
1921 Baseball Mag Prem
1924 Diaz 8
1922 E120
1921 E121-80 May
1921 E121-80 Mays
1922 E121-120
1922 E122 May
1927 E210-1 17
1927 E210-2 17
1921/23 E220
1921 Exhibits
1928 Harringtons 17
1922 Neilsons 7
1922 Neilsons Type II
1935 Schutter-Johnson 8
1928 Sweetman 17
1928 Tharps 17
1923 V100 / E123
1916/20 W-UNC Big Heads
1922 W501 29
1922 W501 103
1928 W502 17
1922 W503 20
1925 W504 130
1919/21 W514 103
1923 W515-1 20
1923 W515-2 20
1922 W573
1921/22 W575-1
1928 Yuenglings 17
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