I choose my avatar because of the angled overprint. It is 6* off. As well as way off center, almost to the left margin. If anyone ever noticed it, they never mentioned it.

Last year I read that an angled overprint was an indication of a fake overprint, can't remember where it read that, had Pneumonia at the time.
Anyway, the stamp image was my avatar ever since I joined back in 2014, it's not one of the expensive overprints, and is only seen in this color with an overprint of that color. Only one stamp looks like this. O10xS, one of the third Special Printings. It's on soft paper.
Just a guess, but by this time, I think Continental BNC could care less about how these stamps looked.

Added soft paper