I've assumed Pizzicato was made at Karlovarske sklo. I've got two pieces with a Moser label on them. I wrote to Moser asking and after seeking clarification of the first reply, I got this from Veronika:
The Moser glassworks has been producing hand-made unleaded glassware and
has its typical design. In the communist regime (about 1950¬īs) the
glasswork MstiŇ°ov (located in the North Bohemia) was connected to Moser
as the area of MstiŇ°ov glasswork was step by step used for mining. That
is why the MstiŇ°ov production (its metallurgical production) was made in
the Moser factory but under the trade mark ‚ÄúKarlovarsk√© sklo‚ÄĚ. After the
year 1980 the glasswork MstiŇ°ov with its employees became extinct and
the assortment was taken over the Cvikov glassworks. This glasswork
Cvikov became later extinct too.
It means that the label Moser should not be on your glass vase as it was
produced by the MstiŇ°ov glassworks, but whose production was on the
ground of Moser glasswork.
It's not a definitive proof, but it does strongly suggest that Pizzicato was made at Karlovarske Sklo.