Eilers Piano Serial Nos.

1902	20000
1904	24000
1906	28000
1908	33000
1910	39000
1912	45200
1914	51000
1916	56500
1918	61000
1920	64000

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.