This is a Beautiful Full Size Piano Bass M. Hohner Accordion. The Accordion is in Very Good Condition with the Exception that 2 Keys are Slightly Raised and the Cloth Over the Sound is Slightly Loose in one Spot. The Case Shows some Wear as Does the Lining Inside the Case where the Accordion Sits. I am not a Musician, But the Sound Sounds Good to Me and all the Keys are Functioning. Serial No. 575864. I have Been Unable to Determine the Model Number.