It has the toad body grip typical of the 121/34's and it looks like it could be true ebony. The only SS dagger I have owned that I believed to have an ebony grip is a 121/34. Although your photo does not show it, I'm sure that the SS code and RZM markings read from the grip downward toward the tip. The internal crossguard markings are most likely EW. Nice original vertical hanger with belt loop. Looks like a 48/34.
