Condition is so-so (the case is a bit beat up, but perhaps not enough to notice while wearing, also can't be polished out because it is filled, not solid gold), and based on the state of that case gasket (and how some of it has slipped into the movement), it desperately needs a service.
Dial/hands are original looking, and crown perhaps is too. Case back is obviously heavily modified.
As far as value: Gold-filled ones go for less than steel, AND this one has a printed logo instead of applied logo. Looks like steel/applied logo can go for ~$450-$500 in about this condition, so I'd consider this one overpriced, but only slightly so.
NOTE: As I said, this NEEDS a service (as will most watches you buy: unless you can ABSOLUTELY trust the seller/it comes with extensive documentation, always buy watches anticipating a need for a service), so figure another $300-$400 on top for that.