Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 778:
1913, 1k, 2k, 3k and 7k, four vertical pairs with double perforation between stamps, full OG, NH or LH (top stamps), VF and rare group, Est. $400-$500, Scott #88-90, 92 var
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