Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1061:
1908, two perforated proofs of 10k in blue or light blue, printed on wove paper without varnish lines, each stamp with 3 instead of 2 lines of inner oval and with top ribbon curls different from issued stamp, both with no gum as produced, VF and rare, Est. $2,000-$2,500, Scott #79
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