Dear Chris,
I am the seller of the aforementioned concertina and would be happy to answer any questions that you may have. According to all the info I have found on concertinas, I found in the "Wheatstone Ledgers" and the dates that correspond to our unit was between March 1851 to March 1854... There were seven listings for this serial number. Also on the label is "By Her Majesty's letters patent C.Wheatstone, inventor, 20,Conduit St. Regent St. London" The serial number on the opposite side is 3162. I have pictures that I can send you if you are interested. I hope that this information helps. We are not historical experts however, we did do research and involving what we have. I do know that the family that this came from belonged to the great grandfather who lived during this time frame.