Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1471:
1908, black overprint (type 9) on perforated 2k-70k, set of seven values, all are postally used, two cancelled on pieces, mostly F/VF, the ”key” stamps properly expertized, C.v. $309, Est. $150-$200 , Bulat #1497/509
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