the correct term is "half post" bottle. Nordic would be a correct assumption - even if this is not an exclusive technique. It could be anyone - Holmegaard did a lot of half-post bottles, but so did Reijmyre, Johansfors, Hadeland, Plus and others. The colour for some reason looks Norwegian. Check the inside neck for a missing stopper, if there isn't any it may have had a cork&coin stopper. Assuming the pontil mark is ground out properly?