Prince Hal, it's hard to say on which are most rare because so many have been in hiding for so long. With no PSA grading, most were happy to collect a handful or try for the whole set. In fact, in past year, a good number of nearly full sets have gone to auction houses (sometimes 67/100 right up to 99/100). You can check PSA and BGS pop reports to see how many have been graded for each (although note again that PSA grading much much tougher on these and getting vast bulk of the grading for them now).
Two that come to mind with very few PSA graded are Joe Wood and Hal Chase but plenty of others. Few of the team cards graded by PSA so far. Most non-HOFers have one or none graded by PSA. We'll see if that changes but HOFers certainly more likely to get graded so far.
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