Bignick's Concertina Spotters' Guide, Yet More English Concertinas

This is a Wheatstone piccolo English concertina (on the right!). Miniature concertinas were often used by music hall performers (and Craig Hollingsworth) as a novelty. Despite their diminutive size, they are real instruments.
A Wheatstone standard concertina with rosewood ends and brass inlay. This was the mainstay of Wheatstone production for the second half of the 19th century. Note the papered bellows with green leather. Later concertinas usually had all black bellows. The idea that black bellows were adopted after Wheatstone's death, though seductive, seems to be unsupported by the evidence.
Another Wheatstone Bass English concertina. The big reeds needed for the deepest bass notes were very large and heavy. They also were sometimes rather slow to 'speak'. Some examples of Bass Concertinas only played when the bellows were compressed, requiring the player to gulp a bellows-full of air from the air button every few seconds.

Even more...

Anglo Concertinas, Duet Concertinas

Acknowledgements and about the author