"Otterup Geværfabrik" i.e. "Otterup arms factory", the other the well know Schultz & Larson, which was located in Otterup. I have read that the rifles were built for the Danish shooter's union in the 60's and 70's. The Schultz & Larson rifle has better finish, and front sight plus a fantastic trigger.
Schultz & Larson