Dahomey was a French colony on the west coast of Africa. The first stamp for Dahomey was issued in 1899. During the WW-II in 1944, Dahomey was incorporated into the French West Africa. The colony finally claimed its independence and became the Republic of Dahomey in 1960.
That’s how I knew it when I started collecting stamps in the late 60s, and I have just two stamps of this country. Both stamps were issued in 1970.
In 1975, the country changed its name and came to known as People’s Republic of Benin.