My site shows a different Wilke. I know the make because I was searching for it. I also have that this company was building vans on Volvo PV445-base and that the production of the Wilke lasted somewhat between 1959 and 1964. Apparently, Teijon Tehtaat Oy was making agricultural machines and was taken over by a Antti Wihuri. I believe that afterwards they have been active in manufacturing of trailers. It seems that it exists today as part of Caterpillar.