Kevin, you are correct about the "Type 4" back we are referring to. It has the condensed first line. It remains to be seen if these are more or less common than the Type 3's as it has only really come to light recently. My first inclination is slightly tougher than Type 3 but the sample size is pretty small.
About the "Reversed" back... I have seen the reversed back on Type 1, 3, and I think every Type 4 I have seen. I do not consider the "Reversed" back a variation at all just a printing goof of sorts. I haven't seen a Type 2 with the reversed back though even though it is the second most common of the backs. (Interesting isn't it?)
-Rhett
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