Use this email address & do exactly as I say.
research@fostoriaglass.org
Simply ask if these candlesticks are Fostoria or Libochovice as both seem to be confused with on one another quite often. Your pics are good so attach them & if they need more they will ask.
Under no circumstances ask for any values or even hint at any values, if you do your request will be immediately trashed.
May take a week, but accuracy will be 100%