I have had this mark pretty much since new. I clean it and it comes back. No i don't wear a watch or any bracelets........ ever. The mark doesn't bother me i was just thinking this afternoon "i wonder if this is internal hardware touching the case were it shouldn't be." I know the photo isn't great but it is off my phone which is all i had handy. the 2 black dots are much more noticeable IRL
