Hello Mias,,,,,,,,,,,What Ben said above is still basically true.
You could receive better assistance if you state your country of residence.
Cheers, Zak.
Hello Tom Louw.
You should contact "https://boeremusiekgilde.co.za/ " They could put you in touch with concertina players in your area.
The website is being updated but there is an e-mail address for the secretary.
They apparently have a branch in Pietersburg/Polokwane.
"Beste geluk." Zak.
Hi.
https://www.fabbricaconcertine.com/eng/index.html#header5-3
This is the factory and they invite e-mail queries.
The bellows are described as leather. Cheers, Zak.
Hello Daniel. Here is your contact point for boeremusiek in Cape Town.
https://www.boeremusiekgilde.co.za/index.php/streke/suidstreek/kaapstad-tak
Groete Sakkie VDV.
Hello Jake. Thank you.
Half of this recording was played on a concertina with a perspex reed pan and the other half on a concertina with a traditional wood reed pan.
For comparison............ and a bit of guesswork required?
Cheers, Zak.