24 Bandonion, Gebrüder Wiesner, ca 1935. Tre kor, 4’ + 8’ + 8’ diskant and 8’ + 16’ + 16’ bass, 160 toner, Rheinisch layout. Dette instrumentet har mange flere toner enn vanlig, og et indre luftspjeld, som heller ikke er vanlig. Knapper i kunststoff, celluloid belegg. 30 x 32 x 32 cm

24 Bandonion, Gebrüder Wiesner, ca 1935. Three voices, 4’ + 8’ + 8’ descant and 8’ + 16’ + 16’ bass, 160 tones, modified Argentinean layout. This instrument has more tones than usual, and an inner air valve, which is also unusual. Synthetic buttons, celluloid veneer. 30 x 32 x 32 cm