I don’t know anything about these. It makes sounds when moved. Many of the buttons are are in a depressed position. Cosmically the instrument is in very good condition. See pictures for details.These accordions were imported from Italy and sold in Sears Roebuck stores in the 1930s and sold for $175.I believe this is a professional model It has 24 white piano keys and 17 black This does not include the 4 extra keys above the keyboard I don’t know what they are but if you add them all together you get a total of 45There’s 120 buttons in rows plus some other buttons and switches - I have no idea what they are.Includes a Geib case in good condition. Latches work but no key.