I don't think it's a P4SS. That green wasn't a standard colour and it has a spare wheel. It's also got over-riders rear but it looks like they've been removed at the front to fit the valance.
It used to have a bonnet strap - look at the missing louvres, and through the rear window is what looks like four point harnesses. It came with an easy up hood (no turnbuckles on B panel) but now has a studded header rail and folding screen.
