Martin Bros. Piano Serial Nos.

1903	12000
1905	16000
1907	18000
1909	23000
1911	29000
1913	35000
1915	41000
1917	47000
1919	52000
1921	56000

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.