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Marc S.have a handful of cards that are notoriously tough to find in even VG/EX condition. T-207s are relatively unpopular compared to the T-205 and T-206 series. Nonetheless, it is probably the most difficult of the three issues to find in top grade -- and putting a complete set together in even mid-to-high grade is a monumental challenge that would take quite a bit of time.
The particular T-207's in this lot are not very notable. From a grading perspective -- for the 6's -- PSA has only graded one seven on each of those examples, but for one where the 6 is the highest-known grade.