Wikipedia has a good explanation of how lithography works.
http://en.wikipedia.org/wiki/Lithography
The effects shown with the dark blue color could happen from a dry plate, but that usually leaves traces on the rest of the item being printed. And the dove like area would be inconsistent or missing on many 350 cards.
The plate or stone being worn wouldn't cause something like that, as the ink accepting area would shrink or become less well defined within the same area.
If you accept the theory of a 150, a 150-350, and a 350 group of printings then there must be at least 3 different plates or stones used. Adding or changing the image on the plate is difficult for anything but fixing a small scratch. It could be done on a stone, I'm not sure it could be done on a modern plate. I think the white lines are a scratch on the plate/stone or a spot that didn't get the ink accepting coating.
Steve B