I have picked up a couple of unusual Campag chainrings, they are double shouldered ones for 1/8th chains. They have a huge amount of material around their outer edge. One is a 61 tooth and the other is a huge 66 tooth. I think they are for use with a derny and that's why I wanted one for my "Derny" project, but would like to sell the other, so that I can progress the project! You can have which ever you want, $85 including post.
Regards
Martin Coopland