Kevin's observations are valid, but I would also have to add that the shape is, based on documentation I have seen on Rückl, does not strike me strongly as their work. My experience, which is limited with them, is that they generally used more simplistic forms than this piece has, so the shape would probably have me looking in another direction also. In many cases with this type of glass, shape is the key to identification.... if it can ever be definitively attributed at all.
I would also add that I would date the piece to the Deco era (1925-1935), as the style of the base and body use a repetition of 3 bulges and steps. "3" was a very big Deco era design technique and you will see repetitions of "3" in many designs of that period.
Craig