Comparing the cut on this vase to a Svarc bell I have, I'm afraid it is very different.
The top of your thistle has far too many thin spikes. My Svarc has 5 small mitre cuts, and above that, very fine parallel curved lines set at random angles to emulate the thistledown.
Under the thistle, my Svarc has a sort of cut gooseberry/bulb swelling shape made from three cuts, satinated on the outside two cuts.
The "leafy part" at the bottom is a very abstract bundle of cuts of different depths and lengths.
Your vase is pretty, but I do not think it is Svarc.
I once found a pressed glass tray that also looked as if the Svarc thistle pattern was the inspiration, it was made from a very poor quality yellow glass and although the pressing was complex, it was not finished off nicely.
It is a spectacular and famous design. It is bound to be emulated.