Personally, I find it difficult to postulate the question since it is limited ONLY to PSA-graded sets. Quite simply, I'm one who doesn't care about registry points. So, to me, PSA's registry is a VERY incomplete catalog of what is out there - particularly in prewar baseball.
If expanded to PSA + SGC + raw, I find it a very interesting discussion. If that is the case, once the 1 of 1 sets like Allegheny are acknowledged, I think the list would probably start and stop with Jim B's N167 set (unless Richard was able to complete his T215 Pirate set - in which case, it would likely "win").
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