The Baca line by Royal Copenhagen includes several different designs and colors (mainly browns and blues), but they are all similar in style and glazing technique, with very earthy, almost stone-like. This one was designed by Nils Thorsson (perhaps he designed all of the Baca line?).
The four-sided vase has two patterns, each of which are repeated twice. The base is marked in green with the Royal Copenhagen logo and Nils Thorsson's stylized initials in the circle at the bottom, and the shape/color numbers and an additional set of initials (KD?) that I assume is the person who did the actual glazing on this piece.