Both the dual tone and single toned W560 sets are BOTH 1929 issues at the earliest!
-The dual tones (either red photo on black suit cards, or black on red) were produced first and are a more mixed-subject set (more football, boxing, actors, etc.). Rogers Hornsby is in the set as a member of the Chicago Cubs, a team he was first with in 1929.
-The single tone set was produced after the dual toned set, and many of the non-baseball subjects were eliminated (not all though). This set has as one of the new players added Fred Maguire with the Boston Braves, a team was not with until 1929.
The common denominator in all of this is the 1929, that is the earliest these sets could have been made. We have had this discussion before...
http://net54baseball.com/showthread....hlight=maguire
I'm not sure there is any debate left about them, were I a rookie card collector I would not be counting these as a 1927 set.
-Rhett