5 Points to note when buying a used Piano
1) Look on the metal plate or the tuning block for the serial number to tell you exactly when the piano was made.
2) Check for rust on the tuning pins. This may affect how well the piano will hold a tuning.
3) Beware piano that are badly out of tune. Restoring them to proper tuning is not always a simple matter.
4) Play each key individually. As soon as your finger releases a key, the damper inside the piano should fall back on the strings and stop them from sounding. The keys should not stick.
5) Used grands are more often in better condition than used vertices. They are generally made better to start with, and are usually treated better.