I’ve only ever bought gray twice, once from DSW and once from greekbum.
Absolutely NO offense intended to either one of them, and I know that they are trusted sellers with impeccable reputations, but I had both my purchases authenticated by RSC and Panerai.
I’d rather find out if there’s an issue sooner than later and address it with the seller. I’m 10000% certain they know their stuff and would never knowingly sell anything that isn’t authentic, but mistakes can happen and it was more for my peace of mind.