oddly Pete, the first thing that sprang to mind when I saw the vase was the neck and rim, was it reminded me of Benny Motzfeld. I have a jar vase by her that looks very similar in shape but not in decor and I'm not sure the pontil mark would be right. But it may be worth checking Scandinavian studio makers at Randsfjord glass and Plus who came along after Benny?
m