...actually, i forgot to mention before that I actually have two concertina tutors from the Salvations Army, one dated 1905, the other 1924. They both have tune arrangement for the concertina bands.

one of them on the back has pricing for some of the instruments ranging from 6pounds, 15 shillings, to 22p, 10s, , with cases....

They also mention a Truimph Duet Concertina....

Mm