I've seen many great watches, but for the finest watch I ever saw at random in the wild, read this repost of something I wrote over two years ago:
So I'm sitting at Starbucks in Framingham, Massachusetts, twenty miles west of Boston, with my 3-3/4 year old son to get a snack. He hasn't napped so he's just hanging on to serenity by a thread. Sitting next to me is a gentleman, casually dressed in very fine clothing, sporting an asymmetric watch in a white metal. Hmmmm. I can't help but stare. You know what question I'd like to ask, but the man is talking with a female companion and I don't want to be rude, so I bite my tounge.
Ah, serendipity....they make like they are going to arm wrestle and the woman asks me to count to three. I oblige. The woman tries to win and the man makes like he's in casual conversation with me, showing he is not feeling any exertion. I play along, "Please tell me about your watch," I say.
"It is a Patek Philippe." He takes it off and allows me to handle it. It is gorgeous. I reciprocate and hand him my VC Jubile 1755. It is not a fair trade, but the least I could do. He tells me that I'm only the second person to take notice of his watch. It's hard having a proper conversation with him, since my son keeps interrupting. I hand the watch back to him with thanks. Preventing the thread of serenity from being cut in a public space trumps WISdom. 
Folks, it was a 3424 in platinum. They don't make them like they used to and they hardly made them then. This is the best picture I could find on the net, though it is of a white gold model (from Antiquorum).
