DBS bikes were the Norwegian equivalent of Schwinn/Murray/Huffy: family fare without any pretensions of sophistication. To 90% of those who bought one, it was simply thought of as a 'bike' not a 'DBS bike'.

Norway was a true cycling backwater at the time your bike was built, so the use of dated components does not necessarily take on too much importance. I guess that your bike is from the mid 70's because of the brake lever hoods, which would not have been seen on 1960's or very early 70's versions.