Dave S , Oct 21, 2010; 05:05 a.m.
This is a Miniature Speed Graphic, a pre-1947 model. The lens is a coated Ektar from 1946, which is likely the original lens. The camera has been retrofitted with a Graflok back so it can take a rollholder. An old-style '23 Graphic' rollholder appears to come with the camera. Mamiya RB67 rollholders will also work, although the later models have safety interlocks that you would have to disable.
As far as ground glass focusing goes, yes, you can focus on the ground glass. *But* I don't see a ground glass focusing screen in the pictures, so it's possible it's missing. It would clip on the back where the rollfilm holder is.
I've never used a Miniature Speed, but I believe the only movement it has is a little front rise. If you are serious about needing camera movements, consider a different camera.
If you want to use a Graphic, an alternate choice would be a post-1947 Century Graphic or '23' Crown Graphic. Those cameras don't have the focal plane shutter of a Speed, so they are lighter in weight. They make good backpacking cameras.