I Vetrai di Borgonovo, I think, is the one who used the VB label in the 1960s. This Florentine (Empoli) production of light transparent colours onto an opal glass is a by-product of the lampshade industry and should be ranged under cheap, cheerful & unpretentious.
But there can be no relation to heavy eastblock lump that Peter just heaved onto the stage. With an opal inner, and a multi coloured pulled outer, and possibly even a clear outer on top of that. you can see how the whole thing becomes too heavy, and at 7 pounds is impossible to finish properly. The neck is sheared, unround and quickly smoothed over, and it isn't even close to the glassmaking standards @ Avem. Have you noticed how we don't get to see the underside?
The dark red Bohemian vase from the 1930s, like the VB item, is quite lightweight, blown in a mould and cut off at the top. There is no finish of the rim, so there is no pontil mark, and Ruth is quite correct in her statement that this is widely regarded as a Bohemian characteristic. You often find this glass type in rose bowl shape with a metal grid and there are hundreds of colour variations. I was always under the impression these were by Kralik - but there may have been several other manufacturers using these techniques.