All, hopefully this offering will not end the thread prematurely as usually happens.   The following attachment may be of use. It gives a pictorial comparison of some of the ranges of various English system concertinas made by Crabb and others. Bass ranges are not included but others have given general information on these in other contributions. In the comparison, reference will be seen to transposed and non-transposed instruments. In most cases, the notes on baritone instruments appear on