You have what appears to be a circa 73 UO8 in pretty nice condition. They make nice fixed gear urban beaters; in fact I just cruised around Richmond tonight on a yellow one from the same period. Look for a sticker that says "tube special allegre peugeot" on the seat tube; that's a giveaway... a PX would say "inoxyadable" in the same place. Plus a PX would have half-chromed rear stays.

The UO is nothing valuable, but they are very good rides. I'd get rid of the cottered cranks and steel rims, personally, and fixie the darn thing... it's even my size. Too bad I already have one, it'd give me something to mess around with.