Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1461:
1918, two stamps with black overprint (type 5) on perforated 1k orange, one has upright overprint, the other one – sideways, both with full OG, LH, VF and rare, expertized by J. Bulat, stamps with upright overprint priced with ”-” in the Cat., while sideways overprint is not listed, Est. $300-$400, Bulat #1186, var
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