Mason & Hamlin Piano Co. Serial Nos.

Year	Serial No.	Year	Serial No.
1900	11800	1955	61800
1905	15000	1960	65200
1910	19100	1965	69100
1915	24000	1970	74263
1920	29000	1975	78730
1925	32700	1980	85853
1930	39600	1985	89393
1935	42600	1990	90000
1940	48000	1995	90520
1946	53000	2000	91000
1950	57800	2003	91640

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.