These unique buttons are known as Paris Backs. This is a term collectors use to describe two-part brass buttons with the word Paris and the manufacturer's name stamped on the back. They are marked A.P. et C., which stands for Albert Parent and Company, a famous French button manufacturer in the late 1890s.
In this piece:
Brass picture buttons depicting The Fox and the Stork, back marked A.P. et C., Paris, circa 1880-1890
Brass-plated pewter settings cast today in the USA
Brass stampings made today in the USA in vintage dies
Nickel-free and lead-free brass lever-back ear wires