French post offices in Zanzibar
The French post offices in Zanzibar were post offices operated by France in Zanzibar from January 16, 1889, to July 31, 1904, when the United Kingdom took direct control of what had previously been a protectorate. The first issues prepared by France for use in Zanzibar were French stamps of the "Type Sage" design, overprinted with denominations expressed in annas (i.e.
Source: Wikipedia — French post offices in Zanzibar (CC BY-SA 4.0)