Depending how I look it seems that there is binding over the frets, which they stopped doing around 86, it was too time consuming for no real benefit.
So if its a real Jackson it's fairly early. That trem is from late 87/88 when Jackson introduced the JT6, which kinda makes sense as Vinnie liked to use the old non-fine tuner Floyd and would have taken it with him.
I'm not as sure about the fret markers, I don't have that much of an eye for detail.
It does seem they acquired it personally from Vinnie somehwow, with his little note on the body there so it legitimately came from him direct it seems.
The lack of a serial worries me, as Jackson were serialising everything after Randy's two guitars, so this guitar SHOULD have a serial that looks like RRxxxx.
See the chart on this page: http://www.jacksonguitars.com/en-AU/sup ... l-numbers/
Randy's mother received RR0000 and the numbers went up from there. Artist guitars are mixed in with everyone else's custom order, so no serial is a very suspicious thing. If you were making a copy, what serial could you give it? None, as being a neck through, there would be a legit guitar somewhere with the same number. Taking the neckplate off a bolt-on is different, as the serial goes with the plate.