Interesting. Usually there's enough time between printing fronts and backs that that wouldn't be common. It would make me think it all happened in production, especially if they ran heavy on the ink. Another indication that it was one of the more typograpghed printing formats. I'm less familiar with those, enough to tell the difference between some types and to tell typography apart from lithography and engraving. It doesn't matter much for cards but with stamps it can be a very big difference. (On one particular one it's a difference between flat plate engraving and rotary press engraving. Less than a millimeter, and the difference is between another stamp for the junk box and paying off the house)
Steve B
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