It was showcased by the instrument builder Mattäus Bauer and quickly became a serious competitor to button accordions. Another source claimed the first piano accordion was introduced in 1854 at the Allegemeine Deutsche Industrieausstellung in München. The first accordion to feature a piano keyboard was probably the instrument introduced in 1852 by Bouton of Paris. The bass piano accordion is a variation of a piano accordion without bass buttons and with the piano keyboard in an octave lower. These go vertically down the side, pointing inward, toward the bellows, making them accessible to only one hand while handling the accordion. In comparison to a piano keyboard, the keys are more rounded, smaller, and lighter to the touch. It may be equipped with any of the available systems for the left-hand manual. Its acoustic mechanism is more that of an organ than a piano, as they are both wind instruments, but the term 'piano accordion'-coined by Guido Deiro in 1910-has remained the popular nomenclature. Piano accordion is an accordion equipped with a right-hand keyboard similar to a piano or organ.

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