Am I missing something? Based upon the specific back scans that were included in post #5, the backs don't look identical to me.
I pointed out in one of the messages that TWO OF THEM are almost identifcal and are off by the smallest shift. This was before this thread detoured off into Texas.
I found it remarkable that a seller would randomly sell two that were so close in backing. I reviewed greg's series 1 ludlow back page and found no pair that were such a close match as two of the ones offered here. It also was odd that when I asked about the source, first answer made it sound like a random trade with a sports card dealer for hockey cards and then the next response said they came from someone who was a lifelong collector of wackys.
I dare anyone to take a pile of ludlows and pull a pair who have backs that are off by barely a centimeter. Possible yes, statistically likely no, hence I asked the questions.