Assuming that "stad" are the four letters, and knowing that Harstad and Repstad are not correct, I looked for the cities having stad at the end of their names, and found three, but nothing here.
But "stad" can also be part of a name, as in "Brødrene Repstads Karosserifabrikk". It is the case with Kristianstad, which was probably the old name for Kristiansund. But nothing here, too. But I don't have any idea where to look, and Google doesn't help to find the karosserifabrikk.
I'm stuck