I don't accept the premise that, when a black dial is crisp and the hands have some indication of moisture damage, including perhaps rust bleeding into the luminous, when present . . . is either always or often an indication that the watch has - more likely than not - been redialed.
If the dial is the correct dial for the watch, one just can't know to a certainty.
I'll add that
I used to think so until I experienced first hand a phenomenon that opened my mind to what I now feel is much more likely.
I've developed this argument in a couple of threads, but I feel it bears repeating.
I own an Enicar Sherpa Graph Mark III (12-66) that has a very clean dial, but at the time of purchase, the central hands had been painted because they had rusted.
At the time of the above photo, there were some scratches on the crystal that are not anywhere on the dial.
After a couple of years, I was able to obtain a set of NOS central hands and I had my watchmaker preserve the original set and install the new set. I was quite happy with the result!
I only took a couple photos during the week I had the watch back before new damage occurred. The photo above is a bit overexposed.
Within a week or so, I went in and out of a very cool air-conditioned building on a hot, humid summer day and suddenly, the watch had completely fogged up, just the one time. It has been over a year since, and there was only the one occasion of fogging up, but that is all it took for the central minutes and hours hands to begin to rust and to stain the new-old luminous.
Of course, one should be cautious in drawing broad conclusions from a single anecdote such as I have shared, but I'm now convinced that pristine dials and moisture-damaged hands are fairly common.
When I first bought the watch below, I thought perhaps that the dial had been replaced. Seen below, before and after having the central hands relumed:
Some will say REDIAL! but I feel certain that, odds are, "some" would likely be wrong.
Cheers,
Joe