French Leopard Stamp With West African Overprints 1915 1916

I have some questions. The ones I have are thin newspaper like paper
and are French with an overprint of Tchad, a brown and orange 2c one and an orangy-pink 1c one. I understand that they were pressed during French occupation in about 1915 and 1916.
Where could I read more about these online please? How many African states had them pressed altogether? Are they rare or common or somewhere in between?Thank you for any good link and any information.

If you have a couple hours to spend, go down the rabbit hole at jkjblue's Big Blue blog. Here is one possible starting point, Ubangi Chari, but Chad and any number of others are just a click away on the left side of the screen.

http://bigblue1840-1940.blogspot.co...i-Shari.html

Thank you, on my way.

Congo Français,without overprint


Moyen Congo,without overprint


Moyen Congo,with Red Cross surcharge

Most are common. The expensive ones are the first overprints from the British and French occupations of the German colonies of Cameroun and Togo.

Some later Cameroun overprints on stamps of Middle Congo. Sadly, I don't have anything for the first three album pages. A shame that MOC placed a stamp from a later series on page 6:

I love the look of them and I am glad they are not expensive yet. I want them all, something to aim for. I thank ya'll for showing, I bet others see them and want them to. If there are Anymore to show please do.