For many of the releases from the mid-60s to late 60s, series 1 printings contained 110 cards, so 10 different rows of 11 cards each. Typically, the series 1 sheet had 4 of these rows printed 3x each, and the other 6 rows were printed 2x each.
However, checklist 1 was printed in two different rows while checklist 2 was printed in only one of those rows. So, while it is true that checklist 2 was printed again in the next series, checklist 1 had two copies in the 1st series printing.
Now the 2nd series printing often had 88 unique cards, which meant that each of the 8 rows were printed 3x each across the sheet. So checklist 2 usually had 5 copies printed from series 1 and series 2 combined (2 from series 1, 3 from series 2) whereas checklist 1 could have anywhere from 4 to 6 copies, depending on which rows that card was in.
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