https://omegaforums.net/threads/unmarked-watches.39957/
I'd ask the seller for a pic of the case back for the ref # since that is really the only way to tell what model the watch is (assuming the case back is original) but I wouldn't say the unmarked dial makes the watch worth less than one that is marked, because it seems they can be otherwise identical.
I would personally look for whether the dial is in good condition and original rather than worrying about whether the dial is marked with the model name since you can figure out the actual model by how it looks and the ref #.
As for the price, I don't have experience chiming in but I've seen Geneves with the 563 movement go for 5-700 on the bay.
Edit: I realized I had nothing specifically to say about the watch in question.. But it sounds like more experienced members have gotten to that already!
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