With the help of Paul Hood, Malcolm Cranfield, Graham Thursby and Risto Brzoza we now know the identity of the vessel.
She's the Johan Jeansson of Kalmarsund Steamship Co., Kalmar, Sweden. She was built in 1930 by Helsingborgs Varfs, Helsingborg. In 1960 she became Johan for Oy Johanship Ab, Vasa and from 1963 was used as a grain storage barge.
She was broken up in Hamina in 1985.