Restarted this dead thread for a very similar but rough PX10 frameset I just picked up. Some unusual features (similar to above) include a riveted head badge, the Olympic rings on the seat tube decal, and an older style 531 decal. Came with a Stronglight Competition headset. Stuck septets (naturally), stem was stuck as well but I got it out.

Odd to see the name "Super Deluxe" below the Peugeot tag on the seat tube. If it was my size, I'd be pulling out my french parts box right now.