I'm generally critical of the idea of buying an old sports touring bike for randonneuring, because most of them are pretty heavy and came with low-end components. However the one the OP mentions is a really nice bike. Nicer than most of the inexpensive 650b bikes available now. It's not some historical footnote, like the bikes that Drew Buck rides. I want to ride a hirondelle one day, but not across France like he did.