I never paid That much attention to the Coverts. I just looked, and you are correct. Also I noticed that it did say "Covert" on the slide.
So if yours doe not say Covert and is not 100% black, then yours Is a little different Stealth afterall. My barrel hood is all stainless.
As far as the black coming off, some guys get upset and don't seem to understand wear patterns. To me it is just a fact of shooting the thing.