Exactly. The more I think about it, the more it seems it must have been done "intentionally.." because how else could it have happened?? It's almost as if the machine, while "stamping" or "imprinting" the zero, got lazy, and just "lifted up" too early, thereby sort of "pulling" the piece that should have gone where the missing portion is, but instead was pulled across the diameter of the zero. That being said--the length of the "odd line," I'll call the part of the zero that "shouldn't be there", seems too short to have been the "missing piece," so to speak. (if that makes any sense lol). But, I have looked very closely with a jewelers loop--it does NOT appeared to have been "scraped" or in any way "altered." It literally looks as though it was just "stamped" with a mini "D". Although that doesn't make sense. I think either my hypothesis, or yours, ie that something somehow obstructed the zero in the printer--but that being said (as you said) that still doesn't account for the "cross-member" line in the zero!! Very strange. I have emailed photos to a few "experts" as suggested by a person I found online.