I have had this derailleur for over 35 years, and now I am compelled to part with it because I need the money to fund my addiction to buy a couple more bikes. (something the wife said about "hobby doesn't pencil"). Anyway, I would love to see this on some old steel French frame, but don't know exactly how old it is. I am thinking it was 20 years old when I acquired it in 1974. It might end up on eBay, but I hate the thought actually. Any information/advice my C&V friends could impart would be much appreciated.