Hazel,
My take on it would be that it is a piece of Martelé by Kralik. Loetz, Kralik and Rindskopf all did Martelé pieces, but the shape strikes me as a Kralik form as opposed to the others. The hard geometric waist on the vase strikes me as Kralik as I have had similar shapes by Kralik in other decors.
That's my 2 cents worth
Craig