I looked at the two pictures that Pete posted aboved. Here is my summary of observation and understanding on the polished thumb safety area.... please correct me if I am wrong:
I have higher level of confidence on the first one:
(1) The edge pointed by the red arrow should be perfectly straight (and it is);
(2) The curve pointed by the blue arrow should be perfectly round (and it is);
(3) The edge pointed by the green arrow should be straight but very slightly blured than the top edge pointed by the red arrow (and it is);
(4) The pink encircled area has a very small unpolished area (and it is);
(5) The depth of polished area is very very shallow (and it is);
(6) No gun blue, nor too marks in the polished area... this area is usually ignored for oiling.... expect patina, light rust or even pits (and it is);
I have a question regarding the "ding" encircled by the white circle -- it has gun blue inside.... if it's a ding (e.g. hit by a nail), I did not see the rough edge around it, where did the metal go? It does not look like a pit either, because it's single and very shallow. I did not any reason to test steel hardness on this area either.
So, what is it? Could it be parts hiting each other in the bluing process and left this tiny mark?
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