The CC process on Fultons, from the ones I've seen, seems to result in particularly wear-resistant colors. I've seen quite a few Fultons, obviously hard used, but with nearly all CC still remaining.

Researcher, I've seen a couple Fultons (not Specials) with a sort of cross-hatch pattern on the receiver. Have not checked SN's to determine if these were earlier vs later guns or something like that, but I've owned a couple pretty late Fultons, and they looked like the gun in the above photos.