"Arpista" zither at Germanisches Nationalmuseum

I found the zither on the website of the Germanisches Nationalmuseum:

http://www.mimo-db.eu/MIMO/infodoc/ged/view.aspx?eid=OAI_GNM_DE_859042

It was made around 1930. If my zither is from the same year, that would make it 82 years old!