The ink colors were hand mixed, and were at least into the 1980's. So a certain red would be a basic red plus a bit of some other colors to alter it just a bit. So if the press operator mixed a dark batch that day or had some leftover from whatever he did before that he decided to use up that would do it. That's the most likely explanation.
Sloppy cleanup between colors would also do that.
Or if they ran red ink on the tan plate.
Registration once adjusted will stay in place accurately, even from one sheet to the next. A double printing of one color is possible, but unusual.
There's a few other odd things that could cause that, but they usually leave other signs that I'm not seeing.
Have you got a high res scan 800-1200dpi? That will show enough detail to get a better idea of which thing happened.
And if someone has a high res scan of a regular one that would help too. I don't have Groom yet.
Steve B
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