In the past these have sometimes been mistaken for Whitefriars. I have one almost identical to yours with a Murano label. Whilst this appears to be an original label, I certainly wouldn't guarantee it. I also have a red one with an impossibly thin stem. Other collectors of bud vases have other colours with various differences in shapes. I have seen a clear Johansfors Bengt Orup one, and whilst very similar, the stem tapered in at the top and was wider where it joined the base. It was also signed on the base, and if I remember correctly it had a polished pontil mark. Have you checked for any signature (it was signed around the outside of the base)?
I hope yours is a Johansfors Bengt Orup vase , as Ivo said it would be very desirable.
Here is a picture of mine