Advance franking seal of office "Imperial German post office TANGA", two-line cancel "franked / with 7 1/2 H. " violet, from KBS "TANGA 5.6.16" to Magamba with on route passing cancellation "MOMBO" with auxiliary year date "16", business letter "West-German commercial and plantations society, Tanga", vertical archive fold, upper flap is absent, expertized Anschütz