As noted above, the dial has been repainted (and re-lumed) very crudely, so the watch would not be desirable to a collector. For what it's worth, the watch may have original Omega components, but we would need to see photos of the inside to be sure.
Since you purchased it at a flea market, I assume that you didn't pay much. And obviously, there was really no opportunity for you to ask the forum before making the purchase. With more experience, you will be able to recognized repainted dials more easily. The strange color of the lume should have been an immediate clue to look more closely. Then you could have noticed the crude and uneven printing and the lack of sharpness of the edge of the sub-dial.
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