Posted By:
Brian HodesI collect Jack Johnson cards if you need scans or whatever maybe I can help...
As to the undervalued sets I have always thought that the Fan Craze cards were quite a bargain -- but they run up against the prejudice against "game cards" and in favor of insert cards. Really though the Fan Craze and the subsequent National Game sets (among others) really offer just about the nicest photos of their particular eras which should be worth something.
The Fan Craze especially because they are nearly the only cards (affordable at least) from the 1904-06 period.