Tanzania 1977 Registered air letter to USA endorsed "9.50" to pay, Butterflies

Description

Tanzania 1977 (March 25) formular Registered Letter sent airmail to USA endorsed "9.50" to pay with single franking Butterflies 10/- Malmalulu tied MOSHI / TANZANIA datestmaps slightly over-paying the combined rate (convenience franking) and red oval "E.A. Customs & Excise / Transfer Traffic Released / Moshi" dated handstamp alongside on face, Salem, OR arrival datestamp (April 7 on back).
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