Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1467:
1918, black overprint (type 9) on 3.50r black and gray, 7r black and yellow, printed on vertically laid paper, both are postally used, F/VF, expertized by J. Bulat, C.v. $200 for No.1309 and ”-” for No.1310, Est. $250-$300 , Bulat #1309-10
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