The issue is…some people are referring to marks where they’ve possible scratched the antenna material themselves. Some (such as myself) are referring to marks that were either there out the box or that, also in my case, appeared overnight on the first night - having only worn the watch around the house and not worn to sleep. Mine do not rub off.
Since then, I’ve travelled on planes multiple times, worn it to bed, gone indoor rock climbing three times a week since getting it and there’s no other antenna marks since the first 24 hours. For some of us, they are under the atenna material which is why they can’t be rubbed off. But a lot of people here always have to know better and belittle what others are trying to explain, without fully understanding what they’re being told 🙄