I have had dials cleaned up before with amazing results. Watchmakers all have their tricks- but if it’s done with a delicate hand and only removes surface grime and doesn’t affect original finishes or paintwork- then I see no issue with it, in fact- as I said- I have had it done.
I wouldn’t consider the dial In question “restored”, it was just cleaned up- although a little heavy handed in some spots but this is not a task for the faint of heart or mildly talented.
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