Revenue stamps of Zanzibar 300/- and US$5 were issued. The Airport Charge 800/- (and possibly the other value) also exist with a handstamped surcharge 1000/-. Revenue stamps of Zanzibar Zanzibar issued revenue stamps from when it was a British protectorate in 1892, to after when it became part of Tanzania in 1993. Zanzibar's first revenues were Indian revenue or special adhesive stamps overprinted ZANZIBAR in capitals, and these were issued between May 1892 and August 1894. Various provisional overprints, some manuscript and some printed, were produced at around 1904, and most of these are rare. In 1905, postage stamps portraying Sultan Seyyid Hamoud bin
Zanzibar century. Persian, Indian, and Arab traders used Zanzibar as a base for voyages between the Middle East, India, and Africa. Unguja, the larger island, offered a protected and defensible harbor, so although the archipelago offered few products of value, traders settled at Zanzibar City ("Stone Town") a convenient point from which to trade with the other Swahili coast towns. The impact of these traders and immigrants on the Swahili culture is uncertain. During the Middle Ages, Zanzibar and other settlements on the Swahili Coast were advanced. The littoral contained a number of autonomous trade cities. These towns grew in wealth