Tristan,
That's a very handsome Rosenthal horse, one I'd love to add to my herd at some point. Nice find with a good early mark.
Speaking off the top of my head, I wonder if it's possible that Karner worked for both companies at the same time. I don't see why this wouldn't be possible unless Karner had an exclusive contract with either. Hopefully someone can provide a more knowledgeable answer.
T.
