After some digging, I found this:
http://209.85.120.99/viewphoto.php?id=6839362&nseq=7
It says it's 160851. But on our site, Nick has a photo of 160851 showing different marking:
http://www.airport-data.com/aircraft/photo/252312L.html
Also jetphotos shows wrong construction number as G-451. According to Joe Baugher's listing, 160839/160856 are Beech T-44A, with c/n from LL-1 to LL-18.
And: http://www.airliners.net/photo/USA---Navy/Beech-T-44A-Pegasus/1689765/&sid=b4d182732246cd3a65a6d2541e01e1a2
Remarks says "160851 / G/0851/451 (cn LL-13) Navy VT-31". Guess they redesignated it?