hello level,in my honest opinion these pieces have nothing to do with kaj franck.
unsure as to why they are marked notsjoe and not marked nuutajarvi notsjo.
there is a glass school at nuutajarvi in hot glass and i think in cold working.
as to whether these items are by well known designers or students i still cannot give any insight but will look out for those initials.
hope this has been of some use