It depends. In general I think its a very bad idea. However that is from a collectors point of view.
A refinished dial is no longer considered original by collectors, and will reduce the value in the collectors market by a significant amount.
If you have a tired looking watch you do not like and would like to have it look "like new" again, and on top do not care about money, value, history and such then you could consider it.
I would normally only consider a refinish/redial if the watch has already been damaged/refinished.
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