I really like Simplex Prestige derailleurs. I know everyone thinks they are junk. But I have them on most of my bikes and they operate great if you are mechanically proficient and use any shift levers other than plastic Simplex.

And everytime I see Liberia I think of John Libera, a Chicago photographer. He photographed many races in the 70's. Lots of great night shots at the Northbrook track. And even made a movie of the National track championships in Kenosha.