I remember the thread earlier in the year we participated in David, on some "Czech" hot worked vases, some being identified as similar to a vase referred to as the Börnevas by Borne Augustsson, Åseda and another was Magnor. Therefore I am not suprised you mention Magnor, a Scandinavian factory that produced hot worked designs, that was discussed in the same thread, amounting in all, to caution required in trying to identify unidentified hot worked "Czech" vases.
Now you have mentioned Magnor, I am even more hesitant about attribution of this one! Some Magnor pieces are very similar in style to some Czech hot worked pieces I have seen....... even the bottom finish is polished smooth in a similar way. I am becoming a bit of a fan of Magnor for that reason, quality hot worked glass! Perhaps this particular vase being bought as vintage in Sweden by Emil, should be telling us all something, coupled with the fact of your memory of a Magnor label!! I have seen this vase for sale in a green colour as well, both the smoke and green I have seen, though possible, would not perhaps have been the most likely Czech colours for me to have predicted and I am certainly happy to be persuaded towards Magnor as a possibility with a Swedish element from Emil, a remembered Magnor label ( coupled with the previous Magnor-Czech posts) and even the green colour vase I saw recently could have been a Magnor looking green... this seems to be gathering some direction.... perhaps ...
bOBA