I must say, getting into watch/clock-making is one of the most obscure things I can imagine. I've had the goal of building a Lego mechanical clock this year (incredibly fun) and I've been trying to find info on trade publications, classes, etc; there's a ton out there, but finding it is very, very difficult. There's not much of a clear path to getting into any of it.
Even the basic stuff I've been doing, though, is a phenomenal challenge. You exercise every part of your brain thoroughly; I've even written a half dozen scripts to calculate optimal gear placement and other such things, which has been a blast. Really can't recommend it enough.
So this might be an interesting combination of approaches to building watches: http://lcamtuf.coredump.cx/gcnc/ He isn't doing watches to my knowledge, but some of his stuff looks pretty fine-grained.
Even the basic stuff I've been doing, though, is a phenomenal challenge. You exercise every part of your brain thoroughly; I've even written a half dozen scripts to calculate optimal gear placement and other such things, which has been a blast. Really can't recommend it enough.