I think it's more likely that it's German than Czech, but I agree on 70s. It fits with the style of German glass made in that time. Unfortunately German glass is difficult to pin down to a maker, since there were many, many factories around before the 1980's, and only a few of those have left any materials available.
Usually my best way to find out what it was is to keep an eye on ebay.de for a similar one to turn up that still has a label on it.
Astrid