Gulbransen Piano Serial Nos.

1915	90000
1918	120000
1921	150000
1924	195000
1927	265000
1930	301000
1933	306000
1936	312000
1939	338000
1942	354000
1945	357000
1948	380000
1951	413000
1954	435500
1957	461000
1960	488300
1963	515000
1966	551100
1969	571000

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.