I agree with T206 Collector. The sales of "equivalent" graded cards is far from accurate. You often see that a card "went for a premium because of xxxxxxx" (whether that is centering, eye-appeal, corners, etc.). That "pyramid", and the high number of low-end graded cards just opens up too much variation to actually have equivalent cards getting the same grades, and vice versa.
As a note, as I guess I am a bit harsh, I would have been very happy to get the grades on your cards. I would have expected a 30/2 on the Cicotte, but would have expected 10/1 on the remaining 3.
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