66 or 67 probably are the toughest. I never completed my 66 set but those SP's are tough. Same with '67. There must have been issues with both because the scarcity of high numbers and how Topps correlated their print runs with series breakdowns changed after 1967.
I think there are more 52 highs out there than we have been led to believe. Sy Berger's story of the garbage scows dumping them is BS IMO.
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