Its real, and an 18K hand-wound piece, they're not overly popular or in high demand so price would be quite modest, probably lower than you'd expect.
Thanks The seller is asking £635.00 for it,is it the movement that is not popular or the Model itself
Both really, if you really like it maybe try negotiating it down a bit, its mainly that being quite a small watch and a bit out of style there's not much demand for them
Case has been very heavily polished. Here's a ref D6650 in14K WG. Notice how crisp the edges are compared to OPs watch.