Jayhawk21 (Paul) welcome to the Lugerforum... what a very interesting question... one I don't know the specific answer to, but a very interesting question none the less...
I doubt sandpaper was used in the production of a Luger finish, more likely the precision machined parts were just polished with varying degrees of grit (like sandpaper) using a rotating polishing wheel on a mandrel. A careful hand procedure in the hands of a master craftsman.
The intended purpose of the pistol under production would determine how smoothe the surface would be... another factor would be the time period when the gun was produced... late war guns have slightly rougher finish than those produced before war shortages.... and the manufacturer also played a role... Krieghoffs are generally better finished than Mausers or other types, and the finest DWM guns were probably their commercial guns of the early 1920's ...and Government arsenal guns like Erfurt never quite came up to the finish standards of the commercial gun producers...
Thats about all the speculation and experience I have time for at the moment, but I am sure others will chime in...
Once again, welcome to the Lugerforum... there is much to learn here.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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