Strombergshyttan vase with small bubbles in underlay.

I don't find this length (33 cm) on any model in the catalogs I have. But it could be a tall version of B894 or B899? If it's Asta Stromberg or Gunnar Nylund design I don't know either. Only that one of them stands behind the vase. It is labeled and a very good piece from Strombergshyttan. Almost a perfect job, done by the masterblower and his assistants, as I see. How it's made, with the small bubbles in the underlay, I can't tell you. However, I think it's very beautiful when the light shines from a window behind. Probably a design from the 1950s.