I bought it second-hand in Germany. Manufactured by Robert Barth Musik Instrumente Fabrik in Stuttgart, Germany.
Your accordion is a Hohner Model No.181/10/4, made in the Hohner factory at Trossingen in the mid-1930s.
“Robert Barth Musik Instrumente Fabrik” in Stuttgart was a music shop that traded from 1878 until 1995.
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Once again thank you Stephen. It’s great that we have people on this forum who are so knowledgeable!
Cheers, Steve
Accordion Service says this is a single row Wiener diatonic accordion No. 181/10/4, built between the 1920s and 1940s. As they have no serial number, it’s not possible to date them more accurately. Hope that helps!
Steve
Here a scan of the relevant catalogue page, this accordion apparently went for 19.50 Reichsmarks back then…
Thank you so much! I believe this will be of great help when I find someone who can help do some maintenance and restoration.