You have it backwards: the checklist was created decades after the boards and was likely derived from a 624 hole punchboard the writer happened to see and described in the SCD listing. That is why the alleged SPs match the checklist.
The checklist is useless for your purposes because the cards cannot fit into your board. They are too wide. But please do punch out all 576 holes on your board and share the results here.
FWIW, the concept of SP in this set is irrelevant. The cards are almost never found, so they are all rare.
Last edited by Exhibitman; 06-05-2019 at 02:09 PM.
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