I dipped my toes in the injector razor waters a few years ago with a J1 just like this one. Except mine was a lot more beat up. I liked it so much I dove in headfirst and tried several different injector variants, and ended up preferring a Type I, which has the same head as a J1 with a shorter handle that works better with my stubby fingers. But for those of you not so afflicted, this J1 should provide an easy, smooth, close shave.
And it's in great condition. Really looks like it may never have been used-- I did no clean-up on this guy, just a bit of buffing and a dip in Barbicide to be on the safe side. The case is in pretty good shape, too, with spring hinges that snap shut really well, but the clear top half does have a few cracks and cloudy areas.