Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 502:
Description
1922-23, Thom blue black overprint on 6p dull violet, right sheet margin block of four, bottom right stamp with accent over ”a” inserted, full OG, NH (bottom stamps) or VLH, VF and scarce multiple, expertized by P. Holcombe, C.v.$925, SG #60a, C.v. $850, both values for hinged error, Est. $600-$800, Scott #52, a
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