I'm having trouble seeing the bubbles inside it.
I've looked at my Unknown Romanian maker pieces, and they all have flat, roughly ground bases, none have the circular polished out pontil mark.
The very shiney iridesence is right for this maker too, but I suspect the bubbles are not.
The bubbles in the Romanian work are like Nazeing bubbles- they have a halo of deeper/more opaque colour around them.
They also tend to be heavily bubbled at the bottom, but less so at the top. And there can be bits of black stuff in the bubbles - unlike the clear bubbles of Schott.
All in all, I think you can rule out the Unknown Romanian maker.
Unless the bubbles have haloes!