Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 709:
1920(c), Tsar Boris, imperforate essays of 10st on yellowish wove paper, four miniature sheets of eight, colors – red, orange, yellow green and bluish green, minor mostly marginal thins from hinge removal, no gum as produced, VF and rare group, Est. $1,000-$1,200
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