1831
0
1832
40
1833
90
1834
150
1835
200
1836
330
1837
460
1838
620
1839
780
1840
980
1841
1180
1842
1420
1843
1670
1844
1920
1845
2290
1846
2560
1847
2860
1848
3160
1849
3470
1850
3780
The serial number of a Boisselot grand piano is normally to
be found on the soundboard, near the treble of the bridge (if
it hasn't been erased by a lousy restorer..).

As the archives haven't been found, we can only work by
deduction, using the production numbers (that turn out to be
exagerated by Marseille reports) and the labels that give
the medals obtained by the firm.

The results can then be corrected by comparing them with
the dated instruments (Liszt 1844 and 1847, I unfortunately
don't have the number of this last piano, now in Weimar,
can anyone help?)
I believe the final results published here to be precise to
within a year either side.