Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1446:
1918, violet overprint (type 2a) on 7r black and yellow, two stamps printed on vertically laid paper, one has inverted overprint, full OG, LH, VF and very scarce, especially stamp with inverted overprint (not mentioned in the Cat.), each one properly expertized, Est. $150-$200, Bulat #258, var
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