Strömbergshyttan unknown model + some other vases to compare with.

Back with a partly unsolved mystery:
Showing a vase from Strömbergshyttan, second from left, an unknown model 32,5 cm in ametyst (or a little coppertoned) underlay. Unsigned and unmarked, but I think it's a Strömbergshyttan vase because it has the same grey-blue crystal as the ordinary Strömbergshyttan 9(15) in the bottom. You see a vase by Bengt Edenfalk from Skruf on the left side, a Sputnik by Asta Strömberg to the right, and far right a bamboo vase by Bo Borgstrom from Åseda. The vases from Skruf and Åseda clearly differ from the two in the middle, regarding the pure crystal in the bottom. Only Strömbergshyttan used this special crystal with grey-blue tint, called 9(15). Therefore, I believe that even this unmarked and unsigned vase is from Strömbergshyttan. The seller also stated it was a vase from Strömbergshyttan.

But who designed the vase is a mystery. I have never seen the model in Strömbergshyttans range before but would guess that it's a 60's product? Rune Strand was a designer at Strömbergshyttan 1963-68 and I would not be surprised if this model is designed by him? But it can of course also be Asta Stromberg. Gunnar Nylund, I think less of in this case.