Concertina. Twenty-four button Anglo-German system. Rectangular. Wooden ends. Leather straps. Four-fold bellows with white/green papers. Buttons are stamped with their note names. Plate on end has stamped within an oval outline: BY HER MAJESTY'S LETTERS/PATENT/WHEATSTONE & Co./INVENTORS/20. CONDIUT STREET./LONDON
The concertina is classified according to the system of Hornbostel and Sachs as a 'set of free reeds, with flexible air reservoir and keyboard'