I've got a decent FF#49 from my childhood PC that I was about to send in for grading. My question is about a grease pencil mark on the front cover (see second pic). There is a big "6" written on the top right of the front cover, which I believe was a price markdown by the newsstand. I believe this was pretty routine back in the day, but I was wondering how this would affect the potential grade. In my unprofessional opinion, I believe this book would be around a 6 otherwise. This book has never been touched. No cleaning or pressing (yet). There is some slight tanning on the back cover, but I'm not sure if it worth trying to clean it. Thoughts?