That depends on whether you are looking to insure it or sell it. The price of these has jumped considerably in the last year. 12 months ago, a good one would have sold for $4,000 but now that could be 50% more for a perfect one. So if it's for insurance purposes, I would say $6,000.
It is difficult to assess your watch from this photo. The case needs quite a bit of work done to it and you can't tell if the lacquer on the dial is intact. Anybody looking to buy it would also want to see good pictures of the movement and both inside and outside of the case back.