I really can't remember the company from my post above, Hirschberg was a wild stab. German companies often made both cheaper soda pieces and more high end crystal pieces. I've yet to acquire a bit of quality Hirschberg myself. The last one I bid on sadly escaped, nearly 2 years ago, and I haven't seen one since.
Stylistically, there are a few more companies you could try that might have done that sort of design in the late 60s or early 70s: WMF, Schott Zwiesel, Nachtmann, Friedrich, Ichendorf, Rosenthal, Gral (but it's not in the Gral book that I know of), Peill (that wasn't the label, or I would have remembered). Unfortunately finding catalogues for any of these is difficult, and only the cheaper/more common pieces turn up regularly, so searching for them on the internet will most likely only show these common/cheaper pieces.
Astrid