Sorry about the broken clicky - it's meant to be a link to John Kirkpatrick's web site, and it does work but....

Spot - the B/C/C# is a very different box from yours as it has stradella (piano accordion system) bass buttons. B/C boxes have useless bass buttons by default but are ofetn retuned so they will work most of the time for D and G, but many Irish players (and it's very much an Irish players instrument) don't bother with the basses much even so.

Anahata