Dietmann Piano Serial Nos.

1955	1
1967	12084
1970	19988
1974	29100
1976	37400
1978	45000
1980	57700
1982	62810
1983	66310
1989	74000

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.