For Steinway grand pianos the serial numbers can be found on the gold coloured harp found inside the piano, to view it you will need to either move or remove the music desk. For Steinway upright pianos the serial number should be clearly visible after opening the top lid. It is a 4 to 6 digit number. Do not include any Letters stamped close to this number, they refer to the Steinway model or other characteristics of the piano. This tool can date any Steinway made between 1856 and 2015 and the result can be considered to be within a year of the piano's actual manufacture date.
Steinway Serial Number :
Click herefor an idea of what this Steinway piano may be worth
You may also be interested in my Yamaha, Kawai and Kemble piano serial number decoders.
If this page has been useful to you please help by spreading the word on Facebook, Twitter, forums etc.