Grinnell Bros. Piano Serial Nos.

1902	506
1906	3100
1910	5700
1915	11300
1920	20000
1925	25500
1930	31800
1935	33400
1939	36400
1941	38000
1946	40000
1950	46000
1955	52001
1960	58890

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.