There were two "Jeff" Pfeffer (brothers) in the ML in the deadball era. This T206 card
features Francis "Big Jeff" Pfeffer (1905 - 1911, Outfielder & Pitcher W-L 31-39).
His younger brother was Edward "Jeff" Pfeffer (1911 - 1924, Pitcher W-L 158 - 112).
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TED Z
T206 Reference
.