This a real button box accordion in a concertina Quad shell for it could have been a Quad Concertina. You will note on the treble right sideThere are 3 ROWS OF BUTTONS JUST LIKE A BUTTON BOX AND IS IN THE KEYS OF "GCF"AND ON THE LEFT 12 BUTTONS BASS AND CORDS JUST LIKE ANY BUTTON BOXTHIS WAS A CREATION OF Bill Brown. Of the formerBROWN MUSIC CO OF NEW ULM MINNESOTA - CONCERTINA COUNTRYIT COMES WITH A NEW CASE AND NECK STRAPTHIS IS A COLLECTORS ITEM VERY FEW OF THEM WERE MADEBUYER PAYS FOR SHIPPINGQUESTIONS CALL ME 1-586-755-6050