Thanks John, I used sand paper as an example because it is the only reference that I could think of. I am sure that there is some system of measuring a metal finish in industrial manufacturing but I am totally ignorant of what it is. Your knowledge of the different firms abilities at finishing their products is a great piece of information to anyone wishing to restore a Luger. I had assumed that as the war progressed that finishes would degrade, but would never have guessed that the finish varied based who made the Luger.
