The serial number, to some extent, affects the value of a Knabe piano. While the value of a piano depends on a number of details, serial numbers identify the piano's make, model and year of manufacture, which usually help in determining its market value.
An antique Knabe piano is valued according to its condition, model and quality of its exterior. An older Knabe piano in good mechanical and musical condition has a higher value. However, the value is lowered if the piano has not been refinished or restored. The size of the piano is also considered during valuation, and generally, a grand piano is more highly valued.