I'm of the thought that we have two explanations of two different but similar things.
In Brians case if I'm reading him correctly, he's referring to total removal of the draw filing linear marks that might remain after the barrels were struck to the final fit & profile. These can be more prevalent on the lower grade guns.
In the example that Craig posted pictures of, the linear marks on the breech face have been purposely done as a decorative embellishment, which is fairly commonly found on the higher grades. These lines are very shallow and can easily disappear with use, if they are original from the factory & still in high condition, it could be a sign that the gun has had very little use & is in like new condition.
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