It looks very polished and the dial looks tired and poor. I would pass unless it was absolutely dirt cheap, and then I'd still pass.
@Davidt is spot on here.
I'm particularly fond of this reference and the one you posted is a poor example.
(papers are a nice thing to have but don't make up for condition)
£600 would be a bargain if it were in good condition but not as it is.
The medallion has all but gone and the dial looks very tired (and it also has a replacement crown)
For reference, the lugs and bezel should have well defined chamfers like this.