I have a 1980 Motobecane 50V, and the bearings in the pulley have just about had it. It makes an awful moaning sound when I'm just pedaling along, and the pulley only turns smoothly when it's being rotated by hand. Any faster and the bearings start to vibrate like crazy. I needs a new one. I would just go for bearings, but the pulley is a bit wobbly as well. So ideally I'd like the pulley and bearings, but in a pinch I'd settle for just a set of bearings.
I have many puch parts, and would be quite happy to make a trade if you aren't after cashy money at this point.