I have a 19-2, blued, 4” with what appears to be a Parkerized top strap. The rest of it is the traditional blue. I understand that this may have been something done after leaving the factory. However the only other smith I’ve had was a 66. So I’m not sure if this is normal for blued guns, maybe something unique from being a police gun, or just something done after it was sold. If anyone has any insight please let me know!