hi DANIEL - thanks for your reply - you are correct with the description of the internal action, which seems to be in very good condition as I was not sure about the age - my main reason for wanting to find out a little more about the instrument is that there appears to be nothing online about GERMAN 28 models - just ENGLISH - and similarly nothing on concertinas in E and B - as I think Eb and Bb are the favoured keys - BILL