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Robert SV.O. Hammon issued postcards featuring both Chicago World Series contenders in 1906 -- and wound up issuing variations of both the Sox and Cubs cards.
After the series concluded, a rare version of the White Sox card was issued with a red overprint proclaiming the team World Champions. As far as the Cubs were concerned, when the team won the 1907 pennant, Hammon issued a variation of the Cubs card with a print line denoting its 1907 league victory.
Here are three examples...sorry if the scans are too wide.
Sox w/overprint:
1906 Cubs:
1906 Cubs w/1907 addition. Note that SGC listed it as 1907 at the request of the submitter:
