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Marc S.There are actually 12 PSA 10's - one was in the Harris collection. They are all commons. The most notable pre-war 10 is the 1914 Cracker Jack Joe Jackson SGC 98/10.0
I used to know the owner of one of the T-206 PSA 10s [he since sold it]. The rumour was, at least 4-5 years ago, that most of those tens were in the hands of a Japanese collector. Not sure if that is still the case...
Cheers-
~ms