i just leave it up to peoples imagination. All my close friends know what i wear, but people i interact with, have no idea.
If people compliment on my watch, i say thank you very much, and continue talking about something else.
Some people will automaticly think its a fake, and often they will openly say so in a jokish manner. These people i just give a smile, and say something in the lines of "for you anythings fake" if they continue i have on occasion added "even my smile"