Noticed this on Ebay.
"1854 period Wheatstone "Duett" concertina in original repaired box"
Not something you see every day.
http://www.ebay.co.uk/itm/1854-period-Wheatstone-Duett-concertina-in-original-repaired-box-1-note-duff-/182368607345?hash=item2a76041c71:g:Tz4AAOSw-0xYO1Kl
1854 period Wheatstone "Duett" concertina in original repaired box