Is it a bolt on neck?
Is it all Jackson hardware? Tunners, pots, I can see the P/U's say Jackson on them. What kind of bridge is it?
What type of wood is the fretboard? Looks like Rosewood
Doesn't look lik there is any neck binding.
What year was it made?

Need more specs.

Looks to be in good shape though.

The Professionals are Japanese. Absolutely none of them were custom shop instruments. Yours seems to be unusual as there were no hardtail, HSH with reverse headstock and sharkies Professionals that I know of. My best guess is a later model body with a neck swap. Either that or some sort of early 90's prototype. Closest thing are the Dinky and fusion HX models but they don't have the reverse headstock or correct pickup config. If it does indeed have a rosewood board and bolt on neck which it appears to it is a lower end Professional or as I said a parts mutt. Worth at most $300. The most desirable of the Professionals were the Pro's which are neckthorugh with ebony boards and MOP inlays. They go around $600-700 now.