I think tritium lume may deteriorate under certain conditions until becoming some kind of "dust" which may drop off, entering in the movement and causing, in the last stage, malfunctioning by intercepting the movement of gears. Although a nice cream patina in lume is always desirable, I would rather no lume at all to aged lume in poor condition.
In this case, dial would not be a problem for me but, in contrast, hands absence of patina is not matching the rest of the watch condition, so probably they are a latter replacement (they are currently available as spare parts).
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