Haegele, Heinrich Piano Serial Nos.

1910	4000
1915	5100
1920	6500
1925	8000
1930	9100
1935	10800
1940	10900
1949	11000
1952	11490
1956	12170
1960	13800
1966	15501
1970	17001
1972	93000
1975	103000
1978	112000
1981	122000

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.