Ken:
Tracking PX-10's are akin to tracking Masi serial numbers. If my memory serves me correct that frame is in the early seventies. My guess is 74. What is unique is that the this version is built with dubois lugs. Most people equate the PX-10 with Nervex lugs (Curly cue). But this is the real article. If you want to compare I have a 73 here is the link. BTW contrary to popular belief not all PX-10's had chrome seat/chain stays. This is also a confusing point in Peugeot lore. Leave it to the French!
http://www.wooljersey.com/
Also what made a Peugeot were the upgrade components. Checkout this link.
http://home.wanadoo.nl/
All you other Francophiles know this already. I'm just the pretender
Regards
Jack (Giacomo) Gabus Laguna Beach, CA jack@shermangabus.com <mailto:jack@shermangabus.com>