I keep my old pocket watch in a dome on my night stand where no absolute direct sunlight hits it. I used to keep it on my mantle in the living room however sun in the early-mid morning I discovered was directly on it for at least a couple hours a day.
Is UV/sunlight ever a concern for old pocket watches? I guess I worry that it could fade the painted black lettering on the enamel dial. I'm sure many lasted because they were stuffed away in drawers and forgotten but with more and more becoming treasured antiques and being put into display cases, I do wonder how much sheltering it needs.
It did occur to me to search for UV protected display domes however I found none a year ago.