Well, it
could be an RG520, but if it is then it's a highly modified one
The HSH
pickup combo in a pickguard which is the tell tale sign when dealing with RGs, in conjunction with an
edge trem suggests it's an RG550, but to the best of my knowledge the 550 was never available with an AANJ in white, and especially not with a rosewood board. It could even be something like an RG350, or 450 with the trem changed to an edge, or just plain mistaken
In truth it doesn't match exactly any RG I know, or can find in my catalogues. I'd approach this one with care !!!