There are two auctions I noticed today for Bianchi Stelvios, both are early 80s. One has a Ofmega bianchi etched crankset:
http://ebay.com/
and the other has listed the same crankset but described as a Bianchi etched Campy NR:
http://ebay.com/
I had this exact crankset, the Ofmega Bianchi etched crankset, on my old Bianchi and must say this is a bit misleading if someone is bidding on the one frameset and thinking he may be getting an added bonus of the campy NR over the $20 or so ofmega!
Walter Skrzypek
Falls Creek, Pa