If you find the dial attractive, perhaps just have it serviced and wear it as it is. I wouldn't invest time and money into any sort of restoration. If you can't tolerate the dial as it is, it would be best to resell it without paying for a service.
If you're not an expert about Omega dials, I don't think it's your responsibility to say that the dial is original or a re-dial. Just say that this is how the watch was when you purchased it and that you are not an expert. That is honest. Given the rough condition of this particular dial, it really doesn't matter very much whether or not it was refinished in the past (in terms of value, I mean).
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