Was going to modify the above post, but too late. Additional info I was given during a phone conversation may help. The original Cambridge Lady Legs had ground flat edges & the bottom was hand ground also. The Mosser ones were only fire polished, not ground & Crystal was the color although their may have been some Light Emerald ones made. Additionally & I forgot about this one...there was an exact copy of the mold (it was a new mold) made by a private monied individual in the early 70's & about 200 were made in light Custard that had Uranium Oxide (they glow), but the Custard color was the only color produced & no one knows what happened to that mold. Maybe this might help distinguish the ones produced by Libochovice. Ken