Back in the good 'ol days (1980s and early '90s) of T206 collecting, my dad and I had purchased literally thousands of T206 cards often as large lots and typically from sellers who didn't care much about the backs.
Looking back at those 'random back' purchases I can remember getting all of the different varieties of backs, except for drum and BL460 (and of course no brown OM, brown lenox or Cobb). I recall getting somewhere around 3 lenox cards but at least 5 BL350s. I know that this is a really small sample size so take it for what it's worth. However, I'd also add that when I actively looked for tougher backs, years ago, BL 350 just seemed easier to find than Lenox.
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