I am not the best at discerning real from fake when it comes to Jack Nicholson, but I think this one could be authentic. Any opinions greatly appreciated!
Here's my Jack to compare it to. Yours does have a similar feel, but very hard to judge definitively. You've got to look at age of signing, where etc. as the story tells a lot.
Thanks for the example Micko! The last name in the piece I provided concerns me... I guess there is no way of definitively knowing unless seen in person.