A close up shot of the embossing. Looks like C 3 / H inside the circle. Which would be SZ / N or Steklo Zavod HEMAH. There are also a couple of large "dots" which resemble those on another Neman cobalt piece that Caleb has listed in the "For Sale" album. Located here: [id=132347294]

The back side of the dome is marked with two vertical bars (or 11)