Hm, I have low-end Peugeot and I shouldn't say that paint is weak. Few layers, including transparent, which is very hard, harder - comparing to typical car acryl.
Are You really sure of having original paint? Maybe someone resprayed slapdash and putted stickers. I don't believe shoddy paint on high-end model, by the way - is this a Chorus?
Yep, very definitely original paintwork. Ive 2 other Peugeots, a 653 and one a 531 (3 main tubes). The paintwork is better on the 531, but that is the later model, the 653 is better (again worst over the chrome, which isnt a surprise) The 653 is shimano 600 tricolor and the 753 was I believe purchased as a frameset only in about 1990.