Hi Keith,
It has been suggested that it could also be Riedel, as they also did their Formosa line, a green aventurine product with red glass. Many of their forms were fairly linear and less organic feeling, and this piece also has that feel to it. They also did a lot of gold enameling on vases.....
I still lean a little towards Rindskopf........
Unless we find the exact shape in an easily identifiable decor, that may be as good as we will do......
Craig