There was a really informative thread, or a least post from a thread from a few years ago. I've been searching but can't find.. pretty tough to narrow search down, since it seems all individual words (T202, back, black, red, 649, etc) entered yield their own results.
Anyway, I think it was Lee Behrens who'd done a pretty intensive research on backs and posted results.
The summary-
Black 649 is most common
Red 30 is a little less common
Black 30 is pretty tough.. I think it contituted like 1% or even less of a pretty large sample size.
I'll post a link if I can find it.
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