S/42 1937 opinion needed

[John Winter]

Alberto,
Any amount of firing will remove the bluing from the crown. I have owned several mint Mauser 98K's and those crowns were definately blued. Perhaps someone else on the forum has owned an unfired Luger of the same vintage as yours, but I have never had one. In closely examining the muzzle crowns of my high condition Lugers, all have the same pattern of concentric circles and show no evidence of having been buffed, which would have an esential step in the finishing process following bluing if the crowns were indeed, originally finished "in the white."If you'd like to whiten the crown, a careful rubbing with undiluted vinegar will have the desired affect but be extremely careful not to drip any onto other areas of the gun, as it will ruin the refinish. Personally, since it's a restoration, I'd leave it as is.