QUOTE(peterhurst @ Oct 30 2004, 05:52 PM)
I just thought that I would mention that Sotherbys London have 4 nice concertinas for sale in there Early music auction November 10th 2004.
That's
this auction, lots 203-206.
I have no idea why, but all the single-instrument listings I lookd at said "Quantity: 2".

Lot 203, a 72-button (71+air) duet is described as "baritone". Given the 9½" size marked in the ledger, I doubt very much that it's an octave lower than normal. That would have it going half an octave lower than my 81-button (80+air) Maccann, which is 11" across. Also, the ledger doesn't note anything unusual. I expect it's just a standard "72".