Here are a ton of scans from old peugeot catalogues, yours has gotta be pre-76 as it looks like they stopped painting the head tube lugs after 1975.

http://home.wanadoo.nl/peugeotshow/

Interesting the smallest frame peugeot you can in 1975 is a 56cm.. did peugeot use center to center measurements or center to top I wonder? As that sounds strange they didnt offer any smaller frames.