To be honest, it's not me, who may know more than the Norwegian motoring historians, but the editor of the source, where I've found the informations for this puzzle. The person who once published this article -which unfortunately disappeared online- is/was a resident of the town, where the coachbuilder was located.
It would be great, if the Norwegian motoring historians could experience something previously unknown by AutoPuzzles, they don't already know about.
The first letter of the town, where the coachbuilder was located is: "S", the last letter of the coachbuilders name: "A"