I have personally seen Dave Davenport in both the 1921 Herpolsheimers set and the 1921 Standard Biscuit (D350-3) sets. It stands to reason if he is in both of those sets that he would be in the Holsum Bread set but I have never visually confirmed this card to exist (yet). He is among the anomolies in those sets where his career had ended several years before the cards were produced. (This is likely the reason he wasn't included in the E121 set).
He also exists in the M101-6 Felix Mendolsohn set
-Rhett
Just FYI: The other anomalies (careers ended in 1917-19) are as follows:
Herpolsheimers-Davenport, John Henry
Holsum-Harry Covaleskie, Ray Morgan
St. Biscuit-Davenport
