Are they "tooling marks" or an intentional decorative design element, something like the "layered" effect on some of Koji Hara's handles and bolsters? Based on something Sal said when I first commented on those marks on the one he sent me to photograph, I'm inclined to think they're the later. Which is not to say you have to like the lines, or shouldn't remove them, just that they may not be a "flaw" but rather something like jimping, a feature which some will like and some will not.