George Atkinson

I have just examined a concertina that has been in the family for at least 70 years. The label states" Lachenal & Co, Patent concertina Manufacturers, London. The serial number is 17472. It has 15 bone keys on each side with a single one by the handle on one side. There are 6 bellows. Markings on one of the handles "Steel Reeds", other markings "English" "M A K" I know nothing about concertinas, would appreciate any information as to origin/date/value. It is in a wooden box, the shape of the concertina, the box is marked "Viceroy" made in Saxony. Many thanks for any help. George Atkinson