Close, but look at the fork crown. It's different.
Same year, but I am sure it's the PR, not the PS.
The difference between the two models is that, in the cheaper PR we have here, the forks are not 531, but Peugeout Lightweight tubes (indeed the forks made me say it was not 531 in the first place!)
Looks very much like this 78 PS10/PSN10 to me.
More here: http://www.peugeotshow.com