Duet Concertinas
Duets are the least common concertina system by far, with so few being made in comparison to their Anglo and English cousins. The majority that were ever constructed were in the Maccann system, with far fewer Crane/Triumph system instruments being available. We do get Jeffries duets in sometimes, although they are considered less desirable due to the fact that there aren’t many players of the Jeffries Duet system. Hayden Duets are almost impossible to get- we have only had one in 42 years and that was a modern Wakker instrument.