It's a custom ghostrider or what became the ghostrider. The headstock is teh same as the ones on his violin guitars and the ghostrider series.
Also teh production GR range had 22 frets and was set neck not thru ala PG's.
The guy out of LA GUNS had a green one with a trem (Same
body shape and headstock) I remember seeing an ad with him one time.
It's a cool guitar