Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1476:
1918, inverted black overprint (type 21) on perforated 7k light blue, full OG, previously hinged, VF, expertized by U.P.V., the stamp is priced with ”-” in the Cat., Est. $150-$200 , Bulat #1722a
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