Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1474:
1918, black overprint (type 10) on perforated 14k blue and carmine, full OG, previously hinged, VF, expertized by J. Bulat, this stamp is priced with ”-” in the Cat., Est. $150-$200 , Bulat #1523
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