Don't know much about Finnish glass, but I do know that this type of design was popular in other countries for a while (probably inspired by the Finnish designs). I've seen examples of other Scandinavian, German and Belgian glass that look stylistically similar, your vase might be one of those. Sadly, trying to attribute Belgian or German glass is not an easy task, as so little of it has been documented adequately, so if your vase is one of those, you might struggle...
Astrid