Not sure what the N means. This cute little baby was given to me by a guy driving an old Invicta car he was showing at a small local steam rally. He said it had been his fathers. I think it is probably 1950s but the Scandinavian brotherhood will know better. Neat lantern with a bayonet fixing for the hood and a lock built into the pump handle. Runs OK too. I have it working here with a Coleman #20 mantle which is really a 150 cp and works quite well in these small lanterns.