Good to get this solved! There is definitely a circular mould line on the base
If it makes sense, the two I have are "the same but different" - I think they were possibly done by centrifugal casting (like some of the Humppila things).
It would be good to find out more about this company, since they seem to be the maker of Christine's mystery daisy vase too (and possibly others which will crop up!).
Christine - I'll email the people at Mäntsälä and see if they know more & report back.
I'm still intrigued by the taller one (in the auction) because that looks slightly different in terms of the points (I think they look more regular)?