Thanks all!
Isn't it interesting that such a distinctive pattern seems to surface exclusively in Vienna?

Unfortunately I think the colours won't help with identification -- seem to me the popular colours for pressed glass from the 1920s-50s used by many glassworks.
@NevB: well spotted, the Brockwitz vase does have a similar hammered panel. I guess this isn't enough evidence to attribute my vases... I do see Brockwitz pieces here, though (and have a small collection of Carnival from them).
For pressed glass I come across locally, I usually suspect (in this order) a Bohemian / Austrian / German / Yugoslavian origin.
Michael