Original antique Bastari squeeze box accordion~marked "Made in German Democratic Republic, color brown, green, leather handles with silver shade decorative trims and hardware distributed around around six side body. | eBay!
Used old diatonic concertina or bandoneon. It has 22 buttons on one side and 28 buttons at the other side. No makersname to be found. It seems that someone removed 9 of the buttons at one side and the reeds for these buttons.