A set of Three matching Antique Brass Keyhole Cover made in France in the 1900s

A set of Three matching Antique Brass Keyhole Cover made in France in the 1900s.
I have not polished them.
The pieces measure each 4 cm by 4 cm approximately
or in inches 1 1/2 inches by 1 1/2 inches approximately.
Two tiny holes to secure to surface.