Scale 29 keys pneumatic
Cardboard 130 mm wide and 0.4 mm thick, folded into 160 mm pages. Treatment with shellac (alcohol-based varnish), very light (80g/L), on the entire underside.
Basses: C D F G A
Melody: c d e f f# g g# a a# b c c# d d# e f f# g g# a a# b c d