It's still quite popular in Poland especially in folk music. There is version with normal bass layout

and one with 24 bass with switch to play minor and 7 chords:
Here are some materials if you are interested in the topic:
The first Polish squeezeboxes (early 20th century) had 12 bass buttons in major mode only. Between I and II world war, 24-bass began to be produced. These had ‘shifts’, allowing the mode to be changed from major to minor by pressing a button underneath the bass keyboard with the thumb. Around 1935, Borucki's label added a “septimal shift” to these instruments. Earlier instruments (1920s) were two voice; later three- and four-voice instruments were constructed. After 1945, they were supplanted by 120-bass instruments, constructed like accordion
The 24-bass, manual and pedal instruments are still in use today. In the cities, the practice of playing has disappeared, while rural musicians and folk bands play, mainly in Radomskie, Świętokrzyskie and Kurpie regions.
Companies producing those instruments in Poland (in the years 1900-1950): Stamirowski (first pedalboard maker), Borucki, Leonardt, Nabe, Gade, Radek, Sawiejko, Jedynak.