I think it is important to point out that the single color set and the bi-cololred sets are DIFFERENT SETS. The selection of subjects changed slightly.
The bi-colored set was produced first (as Frank mentioned) while the single color set came after, although they could have been made the same year as 1929 seems to be the common denominator in all this. The bi-colored set had a much more mixed subject matter as you can see on Leon's sheet above (Walter Hagan(golf), Delores Costello (actress), Max Schmelling (boxer), and a bunch of aviators). While those subjects have been replaced on my single color sheet with more ballplayers, Maguire first played with Boston in 1929 (there's that date again).
The reason I say it is clear that the bi-colored set came first is the card of Lester Bell on my sheet below, when I first saw the card I wondered why the heck there were little parachuters on the card (I assume it was a "wild" card for the deck). Then a few years later I saw the same sheet Leon has and I realized they had just recycled the format already laid out with the aviator as the subject (where a parachutist would have made sense) and replaced that subject with a ballplayer and just kept the parachute design.
-Rhett
