The crown doesn't even look like the correct replacement crown. (Too big)
However, the wrong crown wouldn’t stop me buying a watch if it were a nice watch. (you would want it replaced with at least the correct replacement crown - which I think are only around €50 -because that one doesn’t seem to fit properly)
The case is pretty good but it has had a life and acquired a few scratches along the way, they so not perfect by any means and you would have to see the dial in person to judge how degraded it is.
You would also need proof of a competent service as there are clear signs of rotor rub and you’d want that fixed.
if the dial were okay then, even unserviced, €510 would be pretty cheap for a dome dial dogleg Connie nowadays.
With a service it would be a bit of a bargain.
All depends on that dial.
Hope that helps.