I had posted on this watch a few weeks ago when I asked folks to help me ID it from a grainy photo.
Turns out the movement has been overoiled and some of that oil coated the dial. Fortunately, WUS member YuiryV was able to remove the oil from the dial without damaging the writing, but as a result it revealed or contributed to this patina. The question now is whether to apply a varnish to give it a more glossy look.
A part of me says to leave it as is because a varnish coating applied to a patina dial defeats the purpose of accepting and enjoying the watch in its naturally aged state. The other part says the varnish would help make it pop.