Looking at your Photo of this vessel it looks like an ex German stern trawler. She is of the type that we Brits used to call "Black and White Minsterls" owing to the big funnels aand Hulls being black and superstructure white. Most were named after German university towns eg. Hiedleberg.
A new series of larger trawlers were built using the same names after the class that the Viking was part of were sold.