Overprints
Chad came under civil administration in 1920, and in 1922 received its own stamps, consisting of the issues of Middle Congo overprinted "TCHAD". The initial issue consisted of 18 values ranging from 1 centime to 5 francs. As with Oubangui-Chari, the administrative situation was clarified from 1924 on by the addition of an additional overprint "AFRIQUE EQUATORIALE FRANCAISE". 32 color and value combinations appeared between 1924 and 1933, along with another 9 surcharged with new values.
Read more about this topic: Postage Stamps And Postal History Of Chad