Hazelton Bros. Piano Serial Nos.

1900	25800
1904	35400
1908	45000
1912	53000
1916	61000
1920	73000
1924	230000
1928	258000
1932	268000
1936	276000
1940	289000
1947	401000
1950	408000
1954	427000
1957	511000

It is remarkable that data on piano serial numbers has survived so well for over a century. However, some inaccuracies are inevitable. These serial numbers are to be used only as a rough guide to a piano's age. An exact date does not make a material difference to a piano assessment. To be within 2 to 5 years is accurate enough to give an informed report on a piano.