Patek Philippe

I have puzzled for years over this, so I'm finally going to ask! Most movements I see have all the wheels between the plates, but maybe 5% have a fairly large wheel on top, or outside, of the plates, usually with what, to my uneducated eye, looks like a c... 

I think your answer is in this thread: www.network54.com What+is+the+advantage+of+direct-driven+seconds-+... with several examples here: www.network54.com Now+that+somebody+has+relieved+me+of+trying+to+explain+the

Thanks Steve for your fast reply. I had initially wondered about That wheel being for a centre second hand, but dismissed because so many movements didn't use it. So, what I described as a "click" is a bridge with a pinion hidden underneath and with maybe...