When did Leibniz present his finished mechanical calculator to the French Academy of Sciences?

Answer

1673.

Leibniz finished his machine and presented it to the French Academy of Sciences in 1673, following years of development starting around 1672.

When did Leibniz present his finished mechanical calculator to the French Academy of Sciences?

#Videos

Gottfried Wilhelm Leibniz, 1672, demonstration video - YouTube

inventionmachinecalculatorGottfried Leibniz