Well, I don't know why you would listen to me, but it's your question. I'm not sure from the photograph what cosmetic flaw you are talking about. I think maybe you are talking about the six rows of parallel lines on the first part of the entrance of the center pin (on the recoil shield) when closing the revolver. To me, it hardly qualifies as even a cosmetic flaw, but because of the location of the "flaw" and the function of that dimple, I would not hesitate to polish it out BY HAND, using my index finger, some 600 or so grit paper, and some oil.
You might feel better if you wait and let a few more folks tell you approximately the same thing.