1950s (?) Alpina black dial question

I recently bought this nice Alpina here on OF. I'm not terribly concerned about the originality of the dial since it was inexpensive, but I would like to feel more certain that I know what I have. It is my first time to own a black dialed watch, so I have much to learn.

I believe the dial is original because of the darkened lume on top of gold paint. I suppose this could have been redone, but it looks original to me. In addition, minute markers all are well aligned and fonts look okay. Plus, I don't know who would spend the time repainting the dial of a modest watch. But I can't find any similar examples. Thoughts?

I notice that the laquer is applied over the indices, which seems unusual, but maybe not unheard of? At first I thought it was done later to preserve the aging dial, but then I noticed that the lume seems to be on top of the laquer. Is this kind of thing common?

Finally, how do you typically refer to this style of indices? I would say rhombus, but I can't seem to find any generally accepted term.

I liked the dial as soon as I saw it because it reminded me of this little Omega I own.

I appreciate you sharing your knowledge. Thank you. I'm glad to learn that the applying laquer in this way was not unusual.

Love the old adverts!

great watch no matter what!

Agreed!

Not a black dial but here is mine.