The colour is hard to see on the photo. Is this vase aubergine in colour?
If it was made by Riihimaen Lasi, it will not have a concave 'polished' pontil mark, not for this bullet shape anyhow.
Is it possible to have a picture of the base and also of the rim. It would also be easier to see the colour if the background was white.
Could you post a picture of yours too? The greeny/blue colour is a favourite of mine.