The pontil is polished, however this is seriously a very, very poorly designed vase as its (1) heavy, (2) its a full 12" height & lastly (3) the base is only 2" diameter (and barely that) with the polished recessed pontil being 1 1/4" diameter within the 2" base so the wording top heavy does not do it justice because the actual surface contact area of the base is a roughly a 1/2" diameter circle. You can simply brush against it lightly & the piece will topple over & I imagine it was discontinued rather quickly due to this poor top heavy design which certainly would have lead to many a broken mess...I cannot adequately convey how unstable this piece is, but if you ever encounter one you will see for yourself. If it were ground flat, well that would at least help the instability issue although I am not at all certain it would solve it as top heavy it is.
As for the word "Sweden", I've encountered it before in pieces in the 1956-58 year range with the appropriate number sequence as published, but infrequently/sporadic so I assume the practice was a hit & miss deal that was discontinued or maybe it was added to pieces imported to the U.S. at this time in the 50s, that I do not know. Thanks for your help.