It is a Yamaha YSG - there was an early series which are quite sought after - really nice bulids - then a Series II - this is a later one. Very PRS inspired - very little information out there about them - not sure that many were exported - tough to date too, as Yamaha serial numbers repeat - I picked this up on a whim, to fill a shipment from Japan - will be for sale shortly. Came with a nice Orville Les Paul and a 'project' SG2000 - needs lots of TLC!
Back to the YSG
Twin humbuckers
Set neck
24 frets
Rosewood board
Medium/large frets
Yamaha trem (missing the arm but should be able to get a replacement)
Body shape is nicely contoured (a la PRS)
Can't tell what sort of wood is in these as it is all lacquered
Here is close up of body:
