Here's a similar picture of the pitted rear hub cones I found when overhauling a 1988 Bianchi with a Campy Chorus group (from left to right: NOS cone, used left side cone, used right side cone). I ought the bike on Craig's list, so I don't know what history of impacts there may have been on the rear wheel. Fortunately, Campy hubs were common enough that I was still able to find replacement parts on-line at loosescrews.com. Gave me new respect for the hidden problems and costs sometimes lurking in even high quality used bikes.

Sheldon/Harris Cyclery advice on replacement cones is here:
http://www.sheldonbrown.com/harris/hub-parts.html