Just going to add my .02 here. In 1982 I got a PXN10E serial #0118689. I bought it new at the LBS. The lugs and lugwork were not nice at all. (Lugs look alot like the ones on the eBay bike under discussion). It also had a rear brake bridge so crooked that I brought the frame back to the shop and got a new one under the Peugeot warranty. New frame was (is ) serial # 1043940. The lugwork was marginally better and the brake bridge was straight enough where I didn't want to push my luck and try to do warranty again in pursuit of a "perfect" frame. I still ride the bike now, and really like it, but still marvel at the lousy workmanship in the frame. Just figured it was something you put up with in a Peugeot. I have no doubt the eBay bike is genuine Peugeot.
All The Best,
Don Walter
Tucson, AZ