Quick patina progress

I was wondering today about how it’s important that nice examples of vintage watches are looked after well where possible. However I’m also of the opinion that these watches were designed to be worn and used and as such should be to some extent.

I’m fortunate to own a near pristine 14900 Constellation, but don’t find myself reaching for it that much for fear of it degrading (mainly the dial). I was wondering if anyone has anecdotes or experiences of buying a vintage watch in good condition and wearing it regularly, but finding that over the course of ownership patina started to develop (bubbling on the dial/spotting etc.).

Very true! I imagine when you say moisture intrusion you’re referring to unusually high humidity/splashes of water?

Just speaking in general, and understanding that there are a boatload of other variables to consider, but how much does sunlight exposure contribute to patina/aging of a dial? At least relative to the aforementioned humidity/moisture?

Is there a recommended level of humidity inside or anything you can do besides opening a window?

Dials are painted and varnished. Sunlight is going to affect them depending upon the chemical make-up of the pigments, paint binder and the varnish. Its also well known that light exposure to varnishes and media can cause yellowing. On the other hand, keeping some binders, varnishes and plastics in the dark can induce yellowing which bleaches in light. (Rubens wrote to Philip II of Spain about this). The answer is that there is no simple answer. Preventative care means that you keep the watch in a stable temp and Relative humidty environment, but that's not easy to do if you wear them. Wear them and enjoy them. To quote Burt Lancaster in The Professionals: "Nothing is for always. Except death."