Johnson, E. P. Piano Serial Nos.

1908	100
1911	7000
1914	13000
1917	19000
1920	25600
1923	32000
1926	38000
1928	44000
1930	53000

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.