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Sorry if I'm missing something here as this thread has drifted somewhat from the OP's original question.
For me, original lume is a strong indicator of how the watch has been looked after through the course of its life. With my limited understanding, exposure to moisture, extreme conditions etc. will cause the lume to degrade in colour or condition. So lume originality is important because reluming results in a firm conclusion that the watch has NOT been perfectly looked after. This then calls all sorts of other doubts about the extent to which the watch has been interfered with. Right?
agreed, but for me, lume is like litmus paper, it is the first thing to degrade under humidity etc. So if the lume is original and good, the watch has never been exposed to humidity etc.
Edit: obviously degraded original lume does not automatically mean that the dial has / will degrade too, but non-degraded and original lume is a good indicator that the dial has / will NOT degrade. If you see my logic !