dots on 30 year old GMT dial (magnified)

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Ok folks. Playing with a pretty strong magnifier. I noticed (with naked eye) that there seemed to be a tiny hint of darker spots/lines on the dial surface. Thought it may be shadows of dust on the outer surface of the crystal. Looked with a regular magnifying glass and didn't look like much, but maybe thought a hand or something got loose sometime in the past and left some kind of faint scuffing or IDK. Either way, you have to look very hard to see anything imperfect with the dial finish naked eyed. But since I was bored tonight, some pics that show what appear to be tiny little raised darker black bumps in the finish. Not that is really matters that much, but anyone know what this is? The white stuff is dust, mostly on the scope and crystal. Thanks