Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 537:
1930, Numerals, 10c dark violet, the second issue, top left corner sheet margin plate block of four, imperforate horizontally, positions 1-2/11-12, right pair slightly off center due to slanting vertical perforation in the middle, full OG, NH (hinged on margin), VF and unique item, ex-M. Roberts Collection, Unitrade C.v. CAD$6,000, Est. $1,200-$1,500, Scott #J10a
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