It's been mentioned twice in passing so far.

The chain/fob is more important. see here: http://www.cemp.com/chains.htm as discussed in another thread of similar topic.

Any pocket watch will do. Mine (some of them) don't even work, I carry another watch for that purpose. I got the chains first, then the watches I like to match what I'm wearing (mainly one gold and one silver).

None of my watches are expensive, but they look like a million bucks.