Acrosonic Piano Serial Nos.

1910	57000
1915	83000
1920	127000
1925	172000
1930	217000
1935	251000
1940	304000
1946	365000
1950	450300
1955	559490
1960	679844
1965	784017
1970	912986
1975	1035719
1980	1220374
1985	1365505
1990	1470443
1995	1529416
2000	1563029
2002	1570650

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.