I wore my 243 in an AD. I didn't flash it around, or even think twice of wearing it. It was just what was on my wrist at the time. I even left it on the table when trying on some other watches.
If you're paranoid, you'll probably show it, and you'll get called out. If you act like an idiot about it, you'll probably get called out. If you wear some super-rare model, you'll probably get called out. If you know nothing about your watch (gen movement, real price, etc) you'll probably get called out.
If you act like you belong, no one will think twice.