Please bear in mind - one of our "danish friends" is actually an exiled philistine from Barnsley.
But that said, I've lived here for 15 years and had contact with Denmark for over 20. But I've never seen this brand before.
There are only 3 well-known danish frame brands from this period.
Banani = Bent Nielsen from West Copenhagen. His younger brother has been making the frames for the last umpteen years. But production is very small these days. I bought a Pista frame from them last month.
Schrøder from North Copenhagen - now bought out by new owners and made-to-measure frames are now made in former eastern bloc.
and
Tonny Tornado from Odense, who still makes frames to order today.
There are less well-known manufacturers who may or may not have used other builders and decalled them up.
Jupiter, Everton etc... all had frames made elsewhere for pro riders, while having their own production for standard frames as sold to the general public.
Round this time, small runs of custom painted standard off-the-peg framesets were rife in Denmark, so this frame could be anything. Also, outsourceing to Belgium and Italy was not unknown. Many many small shops sold "own brand" frames painted to order. Photo is not ringing any bells as to it being any of the 3 aforementioned builders.