On the first - the Dura Ace EX sticker will pin it down to a few years. The 600 rear derailleur is from the same period, too, I believe. I just don't know the exact dates.
The second I'm making a [generic] guess at mid 80's due to the sloping fork crown, cable braze-ons, and horizontal drops. But I don't know how those features match up with the builder