My neighbour has given me the chance of this old peugeot which has been in his garage for a few years. He's asked me to 'make him an offer for it'. I've always wanted an old bike to do up but don't really know how much to offer him. It's a Reynolds 531 frame and has all original parts: mavic wheels, mafac brakes, simplex mech. It is a bit rusty in places too though as can be seen on the chrome forks. Am I right in thinking it's a late 70's PRN10? Could any body give me an idea of how much I should offer him?