Looks like a book plate for one of the special edition books on the Mustang. I've seen a number of such books with similar plates, but never with so many signatures. E.g there's a special edition of Bob Goebel's book: "Mustang Ace" with 8 signatures and "P-51: Super Profiles" with another 8 (some of the pilots appear both of these and in your photo). I've seen the plates on ebay (without the book), and in book catalogues.
I have Goebels signed edition. Kai top pilot is ace Herky Green. from what I can see Bob Goebel, Sandy McKorkle, friend Arthur Fiedler, Bob Barkley, richard Dunkin, Urban Drew at the bottom, JH Bennett ?? Powell looks like a super plaque to me
Jim Brooks Walter Goehausen these two are under the top ace Herky Green ...... _______________________________________________________________ heres the run-down for you Kai Jim Brooks - 13 kills Bob Goebel - 11 kills Sandy McCorkle - 11 kills Walter Goehausen - 10 kills the above gents are from the 31st fg Candystripes Herschel Green - 18 kills Richard Dunkin - 9 kills Arthur Fiedler - 8 kills flew a P-51 named Helen Robert Barkley - 5 kills the above gents are from the 325th fg Checkertails E ~
and here you are my friend, hopeful you can make a better scan of this for your data files. Arthur Fiedler with his final kill count on his mount P-51D.