Hi, I looked through all my glassware books and there is two companies that have the exact stem as your’s and they are Fostoria & Cambridge. Morgantown also has this too but appears to be a little fatter. They both made plain elegant glassware. Now i’m not sure Fostoria used uranium. Both companies produced high quality glass and sometimes you can just tell by feeling the glass, no sharp edges etc. Westmoreland and Imperial just to name a few used uranium.