Steve--They are printer's marks. The printer marks where the sheet has to be fed into the press in order to achieve accurate registration, the layering of multiple color. When the registration is off, the image has a fuzzy look to it, something all of us have seen on cards. The registration on your Wagner is very accurate.
And, since I teach printing classes, I think you should donate the card to me and I'll use it at the university to demonstrate an older form of registration for my students!
Cheers, Mike
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