Lets kick this thought around. During the imperial era many Erfurt Lugers will be found with a Crown over RC mark on individual parts. Basically, the Crown over RC indicates the part is "out of tolerance" but functions normally. As reported by Heer Gortz, the mark was that of the Revisions Commission. Apparently the pistol was assembled with the questionable part, tested for function, marked with the Crown RC and sent to war. Keep in mind that Erfurt had no Commercial Luger Division.
The Crown over RC mark is seldom found on DWM Imperial Military lugers. Could the reason be, because DWM had a commercial division where their "out of tolerance" parts could be used? As far as I know, there was no Military Inspectors to check the parts in the Commercial division. One though might be that The tolerances in the Commercial assembly were probably not as close as those on the Military pistols. Consequently, If the pistol functioned normally, away it went.
Now we come to Mauser, Mauser had a Commercial Division and it's a fact that many Commercial Banners were assembled with some rejected Military parts. The parts are normally recognized by the Military marks found on these parts. For example Commercial Banner number 1419V, has a bunch of K-Date parts. I suspect that many of you guys have Banners with obvious Military parts. Opinions??
Could it be that Mauser had marked a few of these barrels with a * mark to indicate the tolerance was not exact but the pistol worked fine. Maybe by late 41 they wanted to get all the good parts used up before the KU guy showed up with his front loader and truck to move out all the real junk parts?
This mark seems to be found on P-38's of the same era. I remember a conversation with some P-38 experts in KC one year. The conversation included the apparent odd * found on many P-38 parts. When the thought was presented that, this mark might represent "out of tolerance" yet acceptable parts. Most seemed to agree that this might be a logical explanation of the * mark. I have no clue what the current opinion might be.