I think the basic rule of thumb is that no good will come of messing with a dial. There are exceptions obviously, and reluming can be done sometimes, but I think there is nothing that can be done for the first dial posted at top.
Also, if you are looking for a replacement, because there is no absolute dial/case association with UG, you are not restricted to the same type of dial, unless you want to. Obviously it needs to fit the case and movement, but the style is up for grabs to some degree. There are more associations between the hands and dial than case and dial, so if you keep those hands you would want a dial with no lume. And gold numbers, applied or otherwise, probably make sense. Anyhow, point being it doesn't have to be that exact type of dial. But the chances of finding a good dial, on it's own, for a decent price, that could be tough.
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