[FrankWakefield]

Odds are that two sheets, one newly printed, placed face to face, seem unlikely to line up like that so well. Those frames line up quite well.

What seems more likely is two separate cards, face to face, would be quite likely to line up that well. Seems to me 'we' jump the gun and want any ink abnormality to be something that happened during the printing process. A hundred years ago there were craftsmen that could print quite well, in some ways much better than what's done today. Still, it may be such as you say...