I'm looking to pick up what may be a very nice one owner 6139 soon. Seller (whom I know) states the crown and stem is missing. Provided that is all that is wrong, I'd love to add this to my nascent collection. Anyone have a preferably NOS or even a used GC one for sale? Thanks, Mike in Chicago

For all you folks who are into the history of watches, one of the historical debates has been who was the first to produce the automatic chronograph. Zenith announced the El Primero in January '69, but didn't make them publicly available till October...