Found this lovely piece in my mailbox today. A German East Africa prepaid franking.
During WWI, postage stamps were in short supply in German East Africa due to difficulties supplying the colony. So, on 18 January 1916, a new system was introduced to reduced the usage of postage stamps. Envelopes could be sent to Morogoro, Dar-es-Salaam, or Tanga to receive a prepaid franking mark. The mark consisted of the value (7 1/2 Heller for a regular rate envelope) and the official seal of the post office. The envelopes could then be used at any local post office.
This cover was sent from Devers & Co. in Dar-es-Salaam to the Imperial District Office in Tabora, German East Africa.
