From a design viewpoint they are stylisticaly French.
However the design was also produced by the Brit’s,
based on their lock/key catalogs of the Victrian period.
I don’t believe ‘ipso facto’ based soley upon visual examination
they can, nor should be, absolutely declared as French keys.
There are some early Canadian government Fort keys I worked on
for restoration. They are based on early French and British key designs
of the same era. As we know, Canada was settled/colonized by both the
French and British Empires.
I couldn’t brand the Keys as being either French or British
because they were made in Canada, based on the original
printed records.
So from a viewpoint of lacking direct factual evidence I submit
a generalization and strong probability that the keys in the photo’s
may be Bi-lingual or of a mixed-heritage.
At least they have both Dual-Nationality and additioanly
have Landed Immigrant Status by residing in our great nation of Canada LOL
Brian……………………………………………….