Petrof Piano Serial nos.

Year	Serial No.	Year	Serial No.
1900	13000	1964	96000
1905	16200	1966	105300
1910	24000	1968	117800
1915	30500	1970	146900
1920	33400	1972	173400
1925	38100	1974	208900
1930	46500	1976	233700
1935	52200	1978	280300
1940	58000	1980	330000
1945	62700	1981	340000
1949	66250	1983	387000
1950	67280	1985	423700
1952	69680	1990	504500
1954	73000	1995	529900
1956	77500	1997	547790
1958	82600	1999	560880
1960	87200	2001	577290
1962	90600	2003	593140

These serial numbers can be used only as a reference point.
An Exact date does not make a material difference to an assessment of a piano - a year or so out 120 years ago really is neither here more there.

The idea that 100% accuracy for all piano makers over a century ago is an interesting thought - but considering that all record keeping would be hand-written and kept in large ledger books, inaccuracies are likely. These records will be as reliable as the clerks whose job it was to keep them. The digital age of barcodes and scanned labels was still in the realm of science fiction. So we have to be content with our best guess numbers.

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Petrof: Short History