I'm a huge fan of this set. It's one of my favorite multi-sport sets out there.
In regards to the back variation - you'll find Bio, Ad & Blank back variations. I believe the Bio back is the most common. However - the Bio Backs have their own variation. A few people have discovered there are Babe Ruth cards with a 1927 Copyright on the back (as opposed to the normal 1926 Copyright). The 1927 version also has some additional text and updated stats. I also recently discoverd a Jack Dempsey with the 1927 Copyright. I'm not sure of any other players that have the 1927 Copyright - but there could very easily be more.
I'm still learning about this set myself, but there are some guy's on this forum that have a wealth of knowledge on the subject.
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Jeff
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