Again, I'm not an expert, but I think this is old, considering it has four of those seams? (If this is the term for what I called press marks). I was certain more modern pressed glass only have two of those, but now im not sure.
Also I think this was not mass produced, at least not on a large scale with such occult symbols. These kind of things dont just appear on everyday items intended for the masses. More like on secretive "masonic" glasses? The green color only adds to the creepiness.
"It could also be the protective eye that watches over you, and the teeth might be eyelashes?"
I think they even can be both at the same time, or maybe it has a hidden meaning only known to the cultists?
One thing is for sure, I dont want such eyes watching over me, so I quickly packed it away.