Hohner Super Suisse IV

Accordion
1

I inherited a Hohner Super Suisse 4. There are three bars on the back. What are they for?

2

Can you perhaps post a photo?

3

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4

Hohner Accordion Service says that these are the treble register switch levers. One is for the home row, the next one for the lower octave, and the third for the two tremolo voices. I hope that’s a help,
Steve

5

Thank you very much.