No explanation necessary. Thing is in good condition, I've used it for some commercial work for a few years and it's never let me down or given me any trouble. No scratches on glass or anything wrong with the optics, there's some natural wear on the piece but nothing like a defined scratch or anything.
Can take photos if you need, but it's in good condition.
Only selling because I don't use it enough and I have too much gear right now.