I have an old Euclid, but it's seen better days. The cage is rather scratched and the bushings are loose. Pulleys are not Campy. I can snap a picture if you'd like but I doubt this is the droid you're looking for. Let me know.
Yes, it's pretty miserable, but miraculously still shifts well even with Rapidfire. A similar, NOS derailleur went on US eBay for a little over 60 USD a few weeks ago, though, so clearly there's not a ton of demand:
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Perfect, well almost. Would I want to scratch it? Actually I am agonising over it as well as hoping someone else will buy it and put me out of my misery?
Is that line just above the question "Do people think you're strange" mean it doesn't apply to me?