I've listed a Campagnolo Nuovo Record 53-tooth chainring, in nice used condition, plus a couple of slightly out-of-timeline items that may be of interest. The auctions end this Sunday evening at 7 PM Pacific time. The seller name is gassworks, and this link should take you to the listings:
http://search.ebay.com/_W0QQsassZgassworksQQhtZ-1
Mitchell Gass
Berkeley, CA, USA