Right-hand manual:
F3 to A6 is the written range for the right-hand manual of a standard 120-bass/41-key piano accordion, three octaves plus a major third. Actual range sounds one octave lower and one octave higher depending on stops chosen. There are piano accordions with up to 49 Keys from written D3 to D7 & the Top D8 is a step above High C on Piano, some have a 32 ft stop on the Treble to extend the range down to a sounding D1.
Left-hand manual
*Stradella bass system
*Free-bass system (en)