Stewart H
·P PatrickJThe only sure way to buy a real omega is to go to an omega owned store.
Even authorised dealers could be dealing in grey market or very high end fakes. If they can cover it or there is a doubt how do you know. At worst they will apologise, pleased ignorance and offer a refund. This is unlikely but possible, grey market is more probable.
I don't think many (if any) ADs would even contemplate selling fake or grey market watches. Why would they risk losing that status?