Very well could be... that is a carbon steel slide, and in an area if worn concealed, could have been against owners sweaty side. A little light oil and 0000 steel wool will make it disappear most likely. Not a sufficient reason to turn it away, if gotten for the right price! Slides can be refinished easily, if desired... frames on the other hand are anodized and a lot trickier... people who are "ring bearers" can seriously scar the anodizing on the frame, as bad or worse than it taking a "skip" along some concrete!!
$600 is way too much. The frame has wear marks all over, the grips look beat up, the lower grip screw looks like a dog was chewing on it and besides the rust on the rear of the slide it looks like there is some pitting starting above the 'INC'. A look at the barrel and rails would tell us more but from what I see it's a sub $400 gun IMO.
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