I just got done trying this razor out, I got probably the best shave I have ever had from a single edge blade.
I used a GEM blade and used it from the wide open to fully closed positions. Wide open is a very close and smooth shave, I did end up with a small cut on my lip from a careless moment.
Its a shame there are not more like this around
I cant say for sure, it looks like the first letter may be a J, or even a S.
I havent been able to find any info on this razor, and I cant find anything like it.