There are a huge number of vintage Omega watches for sale at any given time, and this is not one to pursue.
The dial, though original, features "embossed" indices, which are degraded. The image of the case back is misleading, and the (many) scratches would be much more noticeable in person. The case has been polished, and the hands appear to be incorrect replacements.
I suggest that you find a (much) better example.