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In an Italian forum I could only find this comment:
"Franz Steiner was a small Austrian house (Vienna) active until 1929. Globally they were produced with this mark c.
I will try to contact the author of the message.

the strange thing is that I can't even find the piano's serial number.

this is a picture I found on the net of my piano. it is the same except for the stool. https://img.clasf.it/2018/02/07/Pianofo ... 204909.jpg

Hi everyone, I am Italian and I inherited a piano. Unfortunately I can't understand his story. I searched the brand on the internet but could not find anything. Can you help me ?
The brand is: "F. STEINER"

Thank you
piano img: https://ibb.co/ChZ7Fx9