Hey Bryan,
Great post and thoughts. I think hypothesis 2 makes the most sense too. I find it interesting that there are six different backs that come with this front error. I just never thought a rare error like the Murr'y would've been printed so many times that it would cross over to that many back printings. It didn't dawn on me that they could have been printing multiple backs at the same time on different presses at the same location.
Oh, and congrats on finding the new back and acquiring it as well!
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