"S&B" vase signed "MB"

This little vase is 4" high x 3" widest diameter and weighs about 1.1 lbs. It has a snapped pontil, a pretty messy one, and is signed "S&B" or "S star B" and "MB". I am not sure how the bumps on the shoulder of the vase were achieved.

It is a bit wonky which, at first, made me think it must be a student piece but the way it is signed suggested to me some sort of organized glass maker. That being said I could find nothing else signed like this. I did find a Santa Barbara glass works, but I do not think this is by them. It was super cheap, and I thought that I would entertain myself with some research, but Vase -1 kwqd - 0.

I do suspect that it was made in the US of A.... A mystery.