It's a taste thing. I find a nice watch pretty hot. I'd also rather a guy look down at his watch to tell me the time than look at his phone, it's just little things like that- they have no significant meaning but I prefer it.
Watches only contribute if a girl is already interested in a guy, or a fashion student/freak. Because then she will pay close attention to what he's wearing. About the watches itself, I personally dislike those big gold flashy watches, 'cause I think they make every guy look douchbag-y (that's not a word lol). But like a silver one, or a modest gold one could just help the outfit, making it look... complete? Lol I don't know it could be just me.
Well I mean it can tell how much money a man has or does not have. Make them look more distinguished. But a woman would have to know what kind of brand she's looking at, and that's some kind of dedicated gold digger.