The quality of vintage dials

The last few weeks or months quite some pictures of vintage watches were shown here. Some of them were ahown to find out the type of watch, as the watch was part of an inheritance, or was simply found somewhere.

Some of these watches have a dial that really looks bad, with all kinds of spots, probably caused by moisture. I wonder: has the quality of the dial itself anything to do with this? Are the dials of the modern watches of better quality? Or has the total quality of the watch improved, like the waterproof quality of the case, so that the dials will stay looking good over the next few years?

Some really expensive brands, like Vacheron Constantin, sometimes use gold for the dial, I guess this would help, but this is not a material one would use for the day to day watches, or? I have a divers watch that uses white gold for hands and markers, so no rust to be expected here. For a divers watch it was quite expensive, but then, the whole quality is great, so I don't mind.

Kind regards,
Paul

Thank you, Michael. An undamaged dial is quite important, I guess, it almost literally is the face of the watch.

I wonder how the quality of the dials nowadays has improved: are there different types of dials? The golden dials I read about, they may be plated gold upon brass to achieve the properties needed. I don't think IWC uses email dials, I guess most are painted. The sunray dials are made in a different way maybe. In short, is there a description of the different dials IWC uses? In what way does this differ by what was done in the past? Any knowledge improvement is appreciated.

Kind regards,
Paul