When it glows after being subject to strong light source, what do the glowing plots look like?
I'm not saying this is exhaustive, but every watch I've seen with original lume has a uniform glow (even if faint and for 30 seconds), equal brightness etc.
Ones which have been relumed usually have no glow at all, glow too brightly, or look inconsistent and bitty - I assume as its a mixture of vintage tritium from various sources.
I don't know if this is 100% correct but it's worked for me so far.
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