G'day Foolestroupe/Robin,

I would have a fair bit on the extremely variable pitch over the years ... but we only need to concern ourselves with the differing "concert pitches" from the 1830s onward. It is not in any organised form ... in my files, but I'll check with Richard Evans, who has made a crust by tuning / retuning / rescheming concertinas for some decades. That will be more relevant than the limited file I (presntly) have.

Bob Bolton