That looks like it was a frameback at one time. A while back I bought a Joseph Rodgers & Sons with the same blade shape. I tried to hone it, had no luck, sent it to Glen (gssixgun) and he said it looked like it was a frameback and fixed it. You might contact him before doing anything to that one just to be on the safe side. Here is the link to see how he fixed it;
http://straightrazorpalace.com/vendo...r-customs.html