I believe that the checklist would be on a row that was short printed, since it was previously printed in the last series as well. In addition, for this printing, it is entirely possible that four rows were printed 3x each (the SPs) and three rows printed 4x each, so there would be 43 SPs (44 - checklist) but they are only mildly short printed.
Of course, if the pattern on the 2nd half sheet is different than that described above (i.e., 7th series 1967), then there might only be 11 or 22 real SPs. Until that pattern can be established, we won't know.
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