Zanzibar Sc. #226-229 UPU 75th Anniv October 10/13 1949 Reg Air Mail

Description

Two matched address covers with the set of stamps. #227-8 on a cover postmarked 10/10/49 FDC - but not registered as inscribed. #226, 229 on a cover postmarked 10/13/49 - so technically not FDC and not Registered as inscribed. A "processing glitch"? The stamps used off paper have a cv of .50.
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