I can't see it on the Libochovice pre 1958 Sklo Union CD - but what occurs to me is, are we looking at a correct pairing here?
The base of the vase is sitting directly on the surface of the bowl, which appears to allow no room for stems to project beneath the holes of the frog/support.
Also the moulded decoration of bowl and vase don't seem to share any design features.
Not really my thing, so I could be all at sea with my thoughts Nige