These two derailleurs were donated to our charity. Our all-volunteer organization sells stuff like this to help pay our expenses. Check us out by googling "R Community Bikes". These braze-on derailleurs will go onto eBay, but I don't know enough to accurately describe them. One is bolted on, the other uses a nut. I would appreciate any help identifying them. Thanks in advance.....BTW we gave away over 2500 bikes again in 2013 and did over 3000 free repairs .....