if the lines were irregularly spaced I would go pmd and throw it back. they seem perfectly spaced though so I wanted to ask and make sure. what do you think?
both obv and rev photos of affected area are there. my stand only goes so high so unfortunately I cannot get a full picture :-( hands shake to much to go manual.
Looks like it could be a collar clash. Do the marks match the existing rim reeding? Can't tell from the pictures.
yes they line up with grooved part of the edge. starting at the Y the lines are vertical and going CCW the gradually start to slant.