Carbolite is just plain high carbon steel. No vintage value whatsoever in terms of it being a classic vintage road bike, but still, nothing wrong with having a rideable Peugeot from that era. Peugeot was still making entry-level road bikes plus most of their assorted lower end mountain bikes, hybrids and cruisers with what they called Carbolite well into the late 1990's. I think it would make a fine every day ride. I used to have a Peugeot Chrono road bike made with that steel. I like my finer road bike now, but to be honest, I could never tell that much difference in the actual ride from one steel to the next, except that it was heavier.