This inscription appears in one of several signed books I purchased from the same seller a while back. One of the other books, an Amelia Earhart signed, passed PSA/DNA. This one has not been looked at yet. I'd appreciate any thoughts you may have on this.
I'd put a comment on Herman Darvick's and Andreas Wiemer's profiles asking if they'd give their opinions. They're both good on JFK.
Be careful with Earhart. I've heard that there are some very good forgeries out there. The TPAs, even the most popular ones, aren't always the first to realize that something is questionable. That's where specialists come in.
I collect JFKs, but this one I'm not sure of. To me, the middle line of the inscription looks like JFK's handwriting, and "John" has positive attributes. However, the last name looks strange. It's not really a style I'm too familiar with. So as Steve says, check with Andreas and Herman.
James, thanks for commenting. I hear what you're saying and there are aspects I like and a few I'm less sure of. I've followed Steve's advice so perhaps I'll have some answers one way or the other.