Rudolph Piano Co. Serial Nos.

1903	1910
1907	7500
1910	11600
1913	15000
1916	24000
1919	36000
1923	53000
1926	77700
1929	93000
1932	126000
1935	136000
1938	163000
1940	183000
1947	243000
1949	254000

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.