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fkwThe Holsum set would be mid 1920 at the earliest. There are 2 different poses of Amos Strunk found with a Holsum back and both show him as a White Sox player (traded to White Sox July 23, 1920).
Some have thought there may have been 2 Holsum sets issued, one in mid/late 1920 and one in 1921, but I cant remember all the reason for this.