Hey friend, I am not sure if this interests you or not, but Sara Karloff, Boris' only daughter, is a very nice lady, and will send you a signed 8x10 if you email her (
[email protected]). She either sends a photo of her father as Frankenstein's Monster or a photo of Boris and herself at his "This is Your Life" episode. In any event, she has a very cool signature, her writing resembles her father's in the "Karloff" portion of the signature.
I know Ron Chaney signs TTM, as well as Bela Lugosi, Jr. Not sure how you feel about Monster descendants, but I used to be huge into that stuff, and I know that these 3 are great signers. I unfortunately have sold or given away everything I had, otherwise I would help you out!
God bless,
Kevin