In my opinion the OP did nothing wrong. While I'm not surprised the OB salesperson acted rudely, that says more about the SA's attitude than the actions of the OP. The SA had a chance to forge a relationship with a potential customer down the line and instead turned the person off. If I was the manager of that OB I would be livid. They aren't selling a commodity product--they are selling luxury goods. Sales are about relationships.
And get off the guy's back about "not doing his research." The watch was a gift. And in order to authenticate the watch he went to people a normal person would assume are experts about Omega watches (the OB). And then he went online and posted on a website that should be visited by some of the most expert Omega enthusiasts in the world.
I say, welcome tarun3232. I hope you enjoy your Seamaster and stick around to post here once in awhile.