System: B-Griff, (uni- and bisonoric)

(Collection Oriwohl, Nr. IV-65)

Manufacture: Co. Zygmunt Radek (Warschau) presumably around 1910-20 (8,28kg)

This accordion from a Warsaw workshop contains a decisive innovation compared to the two previous instruments, which ultimately gave the accordion the form and function we know today.

Instead of arranging single reeds in one chamber for a 'chamber chord', the valves of separate chambers are connected simultaneously via mechanismal couplings to produce a chord.