The pattern I observed for many of the 77 card print series was as follows:
Slit 1: A, B, C, D, E, A, F, G, B, C, D, E
Slit 2: x1, x2, A, F, G, B, C, D, E, A, F, G
x1 & x2 varied between series and year but I have not seen any pattern to that Topps procedure other than that shown above.
In 1965, series 5, x1 & x2 were row B and row C (Blanchard & Drabowsky); in 1965, series 7, x1 & x2 were row C (Wyatt) and row E (Hiller). I have not acquired enough information to determine the pattern used in series 6.
In 1966, I haven't completely determine the pattern for series 5, but the row with Downing and the row with Kuenn are repeated at the top of a sheet, so I think that x1 & x2 were rows B & C. I don't have sufficient information for series 6, but for series 7, the miscuts and information I've seen, lead me to think that x1 & x2 were rows D & E (taylor & Salmon).
and for series 6, 1969, x1 & x2 were C (newman) & D (green).
In 1967, they used rows A (Pinson) & F (Rohr) for x1 & x2 at the top of the 2nd slit in series 7.
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