Doll & Sons, Jacob Piano Serial Nos.

1900	30000
1904	59000
1908	87000
1912	105000
1916	123000
1920	142000
1924	161000
1928	175000
1931	181000

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.