I wonder if if might be a studio piece. The feet look rather...um...primitive? for someone like Kralik, Webb or Richardson. Maybe I'm not seeing them well, though, and the glass seems to have a greyish tinge indicating some age. Are there signs of wear (not that that always means much)?
"...if it's clear glass,as it looks, I doubt it is uv reactive"
A lot of clear glass is UV reactive, and that could provide a clue. For instance, if it glowed pink it's more likely to be a later piece. That's a whole 'nother subjeck, though!