Contents.Mason & Hamlin Serial Number Locations 1. Model B, A, AA and BB grand pianos. First, sit at your piano like you are playing it. Smash 4 music mods. Then look into the piano plate and to the left of the centre of the piano. There should be a serial number stamped under the letters.
Serial Number Lookup
The letter will depend on which Mason & Hamlin model you are looking at.2. Model 50 Upright Mason & HamlinYou need to lift the lid of the piano and look for the serial number. This will be stamped on the plate of the piano. If you do not find the serial number in this location look for an oval opening in the plate, just left of the centre of the piano. This opening will be backed with a piece of wood. The number stamped in the wood will be the serial number.