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The strips are frequently published in Norway months or even years after the original publication. Then, a year or two after they were shown in Norwegian newspapers, they come as collections. I have it in one such collection. When I get home from work I can dig up that collection and see its year of publication, but that would be a very approximate barrier for the latest day it could have been published.
In my collection book, it is just a line drawing, a "weekday" strip - earlier only weekend strips used to be colorized.