Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1431:
1921, double (one inverted) black overprint on ½pi green, position 23, roulette 13, full original dry gum as always exists, NH, VF, expertized by D. Graham, C.v. $825, SG #23db, £900 as hinged, Est. $300-$400 , Sc. #L16e
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