Hi Michelle,
I would love to extend my collection of German glass -- there are many many pieces on my wishlist by Zwiesel, Gralglas, Hessenglas, etc.
Unfortunately not that easy to find here on the fleamarkets...
I collect mostly Czech glass (take a look at my
gallery 
The vase you refer to ("Zwiesel, Löffelhardt") is by the designer Dirk was talking about, Heinrich Löffelhardt -- one of the most important German designers during the 1950s and 60s.
Michael