I came across a list of poincons for Chatellerault today while looking for something else.
I found the W with star above in the shield which relates to S. Wideman controller First Class from 1836 to 1843.
He was plain W without the star - second class - from 1829 to 1836.
The director between 1837 and 1839 was C.L.C Dupont de Pontcharra whose stamp was a P with star above in a circle. If that is the same as your P stamp it would date the blade nicely to a two year period.
Regards,
CC
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