Hi Jon,
You are correct about the printer's proof marks you mention, and they usually represent the color registration marks. I've seen examples of those proofs owned by Terry Knouse. The blank backs without the registration marks were, I thought, proofs that were discarded once the registration was accurate and the cards were being checked for color. Once again, this is purely speculation, but as someone who makes handmade books, and has a passing familiarity with printing processes, it would make sense.
This is, however, a good thread, and let's try and solve the mystery. What about a word from "Back-man," our intrepid moderator?!
Barry--No way will I get mail today. Good thing the NYC group doesn't have one of its famed dinners planned for this evening!
Snow-bound cheers,
Mike
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