For what it's worth, although I'm far from expert level on Rathbone, I had a Karloff/Rathbone signed piece that bore a signature that was very similar. Very slight differences. Based on what I owned, and it's provenance, this likely authentic, IMO.
In my opinion, these are missing the flow and characteristics of both men. The freshness of the ink and paper alone would give me pause even if the signatures looked OK.
thanks for help. Its incredibly rare if genuine because of both the 2 sigs being on one page, - but despite it being offered by an aftal and uaac dealer I also have concerns
Rathbone is a signature that I am familiar with. I agree with Steve C's comments. Also a bit too convenient for me how they signed in a manner so conducive to cleanly matting. I'd like to see a much larger image to be more definitive.
I believe an authentic dual signed page would be at least $500 - $600. Maybe more.