Interesting point. I have a 1966 vintage Longines Jamboree whose sweep second hand has a light and even oxidation, making it darker than the other hands, which are pristine. In fact the rest of the watch and the movement show absolutely no signs of any discolouring/oxidation at all - like new.
I actually like the contrast of the darker second hand, and would not even consider replacing it.
It is only a standard manual dress watch, but I find myself putting in on more frequently than some of my far more expensive watches.
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