Mason & Risch Piano Serial Nos.

1900	11000
1905	14700
1910	23400
1915	31700
1920	36300
1925	41000
1930	45700
1935	51000
1940	57300
1945	63300
1950	70000
1955	81000
1960	103000
1965	130000
1970	152000
1974	160310
1978	166250
1982	176570
1985	178730

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.