Except we know that there are short prints in the 6th series that are much tougher. I know that when I bought a complete 7th series in 1974 from Wholesale Card Co. it contained 523-576 and the cards were definitely from vending. It would make no sense to hold back cards when neither matched the checklist. With 24 rows printed on the sheet, there would be one row printed 4 times and 4 rows printed 5 times so the uneven numbers would be able to be matched up. It may be why there were 11 cards that were printed in much smaller quantities than the others in the 6th series.
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