Thoughts on a 2639

More photos needed to assess dial but looks similar to 2639-7 i have. I’d say hands look ok. Crown replaced.
These are quite plentiful so I would look for better example they have nice case lines esp when not overpolished. Lacquer degradation is common on black dials visible on magnification photos but not bad on the wrist. Cal 266 is from 30t movement line
Dial is larger 36mm I believe.

Looking on computer I think @seekingseaquest is correct looks like gilt dial with fairly uniform wearthrough of black lacquer showing underlying brass dial- so called "Starry sky" effect.
The defects I noted on iphone appear to be on crystal instead of dial. I wouldnt worry about crown.
Good luck post photos if you get it

Here is mine.