Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 868:
1904, 10k dark blue, background is inverted, top right corner margin (gutter strips) block of six (3×2) printed on vertically laid paper, full OG, NH or LH (top stamp in the middle and on margin), VF. C.v. $393 as singles, Est. $150-$180, Scott #60a
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