Dutchkiwi

Hi, We have a concertina that my husbands grandmother brought with her to New Zealand around 1908 and we'd be interested to find out a bit about it. It says 'Lachenal & Co, patent concertina manufactured in London.' Serial number is 46628. It is in a velvet lined wooden case, has 48 bone buttons, wood ends and 5 bellows folds. Do you know of anywhere in New Zealand where we can get it fixed as two buttons are stuck? Many thanks