I do believe that you have to compare what you have with this Peugeot web site for ID. Note: the location of the air-pump bracket, the decals, the layout of the chrome on the forks and drop-outs (if any), and sometimes the color, and also the "Peugeot" sticker. If you sift through the pictures you may find the ID. The specs are usually in French or German, but with a bit of imagination you can tell what they are refering to, such as; teeth count, weight, brakes, frame composition.
http://home.wanadoo.nl/peugeotshow
These are classic bikes and do attract attention from 'those who know'. Some parts are availiable if you know how to search the web.
I am restoring a 1975 Peugeot UO8. The local bike shop gets a kick out of it.
Enjoy, Adam