Going back to <k>'s original post, I was also intrigued by the question of what the patterns are on the obverse either side of the shield. They appear to be a cross superimposed on two axes or hammers. I'm not aware that this symbol has any particular significance. The symbol used by Nasjonal Samling (Norway's equivalent of the Nazi party) as an equivalent to the swastika was solkorset, the sun cross (basically a circle with a cross in it). It's not a mintmark either, as the wartime issues carry the crossed hammers mark (underneath the date in this case) of Kongsberg mint.
For want of any other explanation, I tend towards the conclusion that they are just random Norse-inspired decorations, much like the triangular ones on the other side. They could even by a statement of subversion by the mint against Quisling and the Nazis - they are not entirely dissimilar to the H7 monogram used on pre-war and government-in-exile issues. As Thulium points out, pre-war Håkon VII coins enjoyed a status as subversive objects in Norway that analogous pre-war issues in, say, Denmark, Belgium and France didn't as far as I know.