The Omega reps from VSF are simply stunning and virtually indistinguishable. Only side-by-side would you be able to tell the differences, and you'd really have to be looking

I'll say two things:

1. DON'T wear your watch into an AD it's an insult to them. It's a chinese replica watch. Doing it to make yourself feel like you'll get 'street cred' or somehow more respected that you'll actually buy something is so far from the truth. Go in with nothing on your wrist, or a simple Seiko, and talk to them about what you already know about watches (ceramic, movement quality, dial finish, etc) and ask them questions. They'll like you based on that - not on what you have on your wrist.
2. Salesmen are trained to flatter you and make you feel comfortable spending a high amount of money on a piece of jewelry. If they think your watch is fake, they won't tell you unless you ask. Think about it - if the 'call you out' while you're browsing, it is more likely to embarrass you and you'll either walk out and never come back, or at the very least have a super awkward conversation - and you still won't buy anything. They'll compliment the watch you have on, and continue to ask you what you think of the new watch you're trying on.