Who Are You VS Who You Are

Snapped this from a magazine! It's a SEIKO lady watch advertisement.

The quote: "It's your watch that tells most about who you are". I would consider this sentence as VAGUE! How can a watch tells someone who you are? Even it was MOST about who you are. I understand that the advertiser was trying to claim that by owning this SEIKO watch, would probably show your taste? lifestyle? or personality?

Well, what i can think of is that i would know that person can afford to buy that watch or that person likes that watch instead of seeing who that person is. :p