A couple Dura-Ace anecdotes (why BF just tossed out my original reply - expired token, WTF?)...
- My Schwinn Volare (1978) has first-gen Dura-Ace. It seems every bit as good as Campy of the era. I just replaced the DA shifters with Simplex Retrofriction yesterday. Might have gotten slightly better yet.
- I looked at a completely disassembled (down to unlacing the wheels!) early 70s Colnago a few years ago which had Dura-Ace componentry. The seller said his father-in-law had purchased the bike from Sigi Renz in (I think) Munich. Sigi apparently recommended the D-A saying it was good as Campy but half the price.