Copenhagen arms and some flags

When I use my handicam in the archives the results go in for example
http://karl-dane.blogspot.com/

on the way out of the city hall this coat of arms in the enquiry office by main door caught my eye

what are these yellow or blue flags with the Dannebrog quartered?
see Flags of the World but unknown

INSIGNIA REGIA CIVITATIS UBERA HAFNIENSIS
Hafnia is latin for Copenhagen well Kjøbenavn or Köbenhafn to mention a couple of the early spellings


a square Dannebrog suggest an early date if authentic