The SEAT POST
In the photo above you can see a milled seat post that looks identical to mine.
This photo is from page 124/5 of the January 2005 issue of Cycle Sport America. The photo was taken during the 1971 Tour de France.
UPDATE: According to Ken Denny, the hole in the underside of the seat lug indicates that the frame in the photo above was made by Kessels. This photo was taken in 1971, so it is consistent with Ken's belief that Kessels supplied Eddy's frames at the beginning of Eddy's tenure with Molteni. Thanks Ken.
In this extreme close-up you can see a milled seat post that is definitely recognizable as a Campagnolo Nuovo Record.
This photo is from the cover of the Premier Issue (July 1983) of Winning magazine. You can see the whole cover below.
Here is another photo of Eddy on a similar post. The only difference I can see is that the milled flutes appear to be longer - notice how they disappear into the frame. (Also of interest is the Cinelli 1R stem which is milled. Now that is a truly rare stem. I've never seen one even on eBay.)
Photo courtesy of Tam Pham.
Maybe the seat post above is like this one, which definitely has longer flutes, and more of them as well - it has 8 flutes instead of the 6 that my seat post has..
This is a 1973 Colnago Super I used to own. You can see more pics of this bike here.