Doherty, W & Co Piano Serial Nos.

1902	800
1905	1000
1909	1800
1912	3000
1915	7000
1917	10000
1920	16000
1924	95000
1927	100000
1930	102000
1936	105000
1939	107800
1942	110400
1947	111250
1950	113794
1953	115655
1956	117400
1959	120224
1961	121341

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.