This is an antique, early 20th century, hand accordion, which is also known as a 'concertina' that was produced by German maker, M. Hohner. It comes with the original carrying case that is personalized with the name of the original owner carved in the wooden case. This is a single row player and there are marketing notations on it that Hohner was a Gold Medal winner at the 1904 St. Louis World's Fair; thus dating the concertina to having been manufactured post 1904 and not later than 1910 - 1915. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.