The accordion has been imported by Fazer’s music store. There is a plate on the body of the instrument that reads: “Helsingin Uusi Musiikkikauppa K.G. Fazer Aleksanderinkatu 38”. The same texts can also be found in Swedish: “Helsingfors, Nya Musikhandel KG Fazer Alexandersgatan 38”.
The history of Fazer’s music business can be found e.g. from Wikipedia.