Originally Posted by
jeirvine
It's from 1936, and has an early derailleur setup. Modern RDs deal with the chain tension with the two jockey wheels. This early attempt had it as a separate arm. The seller is also selling a similar derailleur group separately. Expect both to fetch a handsome price. They are quire rare:
http://www.ebay.fr/itm/141115040021
Thanks for the education. I can imagine it's quite rare, in all my 60 years of living, of course the first 15 years don't count since I wasn't into road bikes yet, I have never seen that before, I have seen some early stuff with the small chain coming out that operated the derailleur and long lever thrown front derailleurs, but not that displayed here. Interesting.