Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1475:
1918, double black overprint (type 14) on 20k blue and carmine, postally used, F/VF, expertized by J. Bulat, the stamp is priced with ”-” in the Cat., Est. $100-$150 , Bulat #1582a
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