Norwegian DBS female bicycle with round flat seat

Today I still use this about 30 years old female bicycle from the OEGLAND company in Sandnes. Except from the problem that the dynamo light did not give any light at all, it works still although it is not as comfortable as the much improved prototype Calvin CA 700 trike.
I have replaced the 4 old batteries in the ligth with built-in radio which I have fastened to the plastic box in the front which I use to carry food from the Brusand COOP.