To answer your question about the registration shift in the biplane vignette, no. It should not make a difference, positively or negatively, as the shift is slightly high. If it were higher, you'd have an EFO (error, freaks & oddities), but it is within normal parameters for 1918 production using two plates.
For those who are not aware of it, all early bicolor stamps were produced using two plates. The first run through would print the border of the stamp (in the case of C3, this would be the red area. A second press would have the blue biplane, or vignette (the subject within the border), and print that in a separate run.
It was because of this two step process we have the jenny invert. A single sheet made it through the process, fed into the second printing upside down. Only one pane was every found, and well, everyone knows the rest of that story....
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