Gors and Kallmann Piano Serial Nos.

Year	Serial No.	Year	Serial No.
1908	40000	1928	65200
1909	41800	1929	65750
1910	44200	1930	66450
1911	46630	1931	66800
1912	49360	1932	67200
1913	52250	1933	67500
1914	55690	1934	68750
1915	57300	1935	69000
1917	58200	1940	74000
1918	58500	1945	77000
1919	58700	1950	79800
1920	59000	1957	80000
1921	60400	1958	80600
1922	60750	1960	82000
1923	61200	1970	83501
1924	61830	1973	85001
1925	42620	1974	85500
1926	63610	1976	86900
1927	64450	1980	88000

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.