The trouble is, the artificial "distressed" finishes don't look like a naturally aged pistol. They are way too bright, and usually mimic (or try to) a pistol that has been rusted in the past. I think that is the exception for old, naturally aged pistols. If you carried and used, and depended on a pistol, one did not just let it rust in the holster. Yes, they may have rusted away in attics and closets later, but that...is another story.
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This is a naturally aged barrel, although the lighting in the pic is not right, it does not have that purple tint. Since this pic, I did take the blue off the cylinder with vinegar, and got it to match the barrel with some diluted cold blue and dirty cleaning patches. (from cleaning the barrel after shooting) even then it took about a month of actual aging to match the barrel. The closest the bright, aged finishes come to looking the part, is that of a rusted relic that has been wire brushed.
A naturally aged pistol might have some pitting, but mostly it will look like a well cared for pistol, that has been in use and carried much, not a wire brushed ex-rust bucket.