I personally doubt the hands, while I agree they don't always age exactly, original ones don't usually exhibit this difference in the base colour.
That said, I don't see that the provenance of the lume on these antique pieces is a significant issue. My point was that in this period, lume was considered a consumable - so who can say in any specific case? I have some I know are original, and some I believe are original - I can't prove in any but one case that it is actually original - it is all speculation, I don't know any test that can determine the difference between 100 year old lume and 98 year old lume etc.
There is also the question, if it should be preserved. As at such an age it is friable, damaging to the hands, movement and potentially health.
I agree that the OPs is worth trying to preserve. They have to be pretty much gone before I consider redoing them myself.
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