When you say worth a punt I'm not certain what you mean?
The ad clearly says it a custom built case, which houses a genuine omega movement, with a refinished dial, so you know what your buying.
A collector would have little interest in this and any resale value as such is really in the movement, or selling to a non collector.
I don't know what a fair price for the watch is, but talk of a punt and gambling will not result in you coming out on top even with the 20% discount.
There is nothing wrong with buying the watch if you like it and it meets your needs. However I would personally avoid it and prefer to find a model or reference that is discussed on OF and where you can build up some knowledge and feel more comfortable before you buy.
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