It's a GraphTech ResoMax bridge. It was used on the GSR T-500, too.
http://graphtech.com/products/brands/resomax/resomax-tune-o-matic-bridges
Hey Hey, My My.
Guild has astonished me with the maple they use on their guitars. When I look at my F47M for a few seconds it's like in 3D, I'm sure you know what I'm talking about Tx.
Ralph
That is just the light playing tricks in the photos Chazmo, It is full hollow but the flash is really lighting up the inside of the back maple which is giving it a less than Full hollow appearance. The flash is also eliminating any shadows that the F-Hole openings may be casting on the inside back as well. The F-Holes are open to the soundbox like every other Full Hollow X500 made.
TX
With that pickup swap, it seems like I should be putting this guitar on my "want list"!