Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1478:
1918, black overprint (type 24) on 3k-70k, including stamps of 15k, 25k and 35k cancelled on pieces, mostly fresh and F/VF, ex-Dr. Zelonka, C.v. $215, 15k and 25k are priced with ”-” in the Cat. Est. $300-$400 , Bulat #1777/87
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