The logo bit could be A and S, or it could be A, O and S.
I thought at first the marks were acid etched. Depending on what was used to paint the acid on, it could look like this, bit after you suggestion of it being enamelled, m, I'm not so sure either!
I wanted it to be Steuben, but I really don't think it is. I've dug around their marks.
It quite possibly is American, given that is where the OP is. I know glass travels though.

I do understand the matter of use of continental European-style numerals, but the use of those is quite widespread.
I always cross my 7s. They're naked without a bar.
My knowledge of American studios is very limited. I've checked the index of "American Studio Glass 1960-1990" (Martha Drexler Lynne) and not found anything with any combination of those initials.
But the index is lousy. I'm only a tiny bit into reading the book and filling in my own index in the back. And this piece could be from after that time.
The AS won't be Archimede Segoso, I assume.

Seattle Art Museum was about the closest.