P-38 Data Plate Question

[Jack Cook]

You have to have the paperwork to back it up.

[Paul Patist]

Reading all this I wonder what the value (not that I'm selling it...) would be of this P-51 dataplate? It's from Lawrence P. Giarrizzo, 2 Nov 44, KIA Wing failure. P-51D, Tail number 44-13735, U've Had It, G4-H, 362nd FS.
This a/c once was flown by John B. England.

http://www.cebudanderson.com/johnengladsmustangs.htm

Paul