Rick, the differences you noted are the characteristics that distinguish the two sets (I think those were outlined in the article I wrote for Old Cardboard several years back). The two sets are completely different sets and should be viewed and checklisted as such.
I have been slowly cataloging the two sets for some time and currently have in my database 76 diff cards known with the Type 1 (or 1920) back and 55 different with the Type 2 (or 1921) back. Don't let this fool you, however, into thinking the Type 1 back is more common as it is not. There have been a few finds of 1920's that featured almost all different players while I have seen as many as 5-10 different of the same player with the Type 2 back.
I have been stockpiling the Holsum cards for many years and know of another collection that also has a fair number of cards. I would have to check but I think I have 85 different cards total between the back types.
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