factory polishing question

[ben_g1]

When does S&W polish a gun (1960's-1970's blued) during manufacturing?

I ask because looking at some guns, that are known to be original finishes, the roll marking around the letters show the metal slightly distressed.
On others it hard to see any distress area like it had been polished after being stamped or rolled.

 

[Alk8944]

Some of the roll-markings, particularly the S&W logo when on the sideplate, and address were frequently applied after final polishing, resulting in a raised burr around the roll-mark. Generally the barrel markings, Smith & Wesson, Caliber, and patent dates before c. 1946, were applied before final polishing so they do not show the raised burring. This is one of the principal ways to determine if the gun has been re-finished!

 

[ben_g1]

Some of the roll-markings, particularly the S&W logo when on the sideplate, and address were frequently applied after final polishing, resulting in a raised burr around the roll-mark. Generally the barrel markings, Smith & Wesson, Caliber, and patent dates before c. 1946, were applied before final polishing so they do not show the raised burring. This is one of the principal ways to determine if the gun has been re-finished!

Is that the same for nickel guns? I don't see the raised metal around the stampings like on blue guns.

Also on older Smiths, like pre-model numbers guns, the stampings seem lighter than on later Smiths. Would that be reason for not seeing the raised or distressed metal? Thanks