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fkwI dont think the E145-1 Chance is any tougher than any of the other E145-1 cards.
The reason it is more desirable (higher value) is because #99 Frank Chance is only found in the 1914 set, he was replaced by #99 Hal Chase for the 1915 E145-2 set. 1914 cards are far tougher than the 1915s because the 1914s were only available in boxes, and the 1915s came in boxes and as a complete set through the mail from the company.