Andy
Its difficult to answer your questions specifically, but there are a few aspects to factor in when considering common backs.
Things like shortened print runs in 1909 & 1911, player changes, new player poses to name a few.
I'm guessing collectors/board members who do player back runs experience this.
If I remember correctly, one board member posted that he looked for 2 years trying to find a player with a certain Sweet Caporal back for his player run.
Echoing what Johnny said, I too believe it happens in all subsets.
Jantz
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